HYDROBIOLOGICAL STUDIES WITHIN THE TEA GARDENS AT SRIMANGAL, BANGLADESH


Bangladesh J. Plant Taxon. 12(2): 49-62, 2005 (December) 

HYDROBIOLOGICAL STUDIES WITHIN THE TEA GARDENS  
AT SRIMANGAL, BANGLADESH. IV. DESMIDS (17 GENERA) 

 
A. K. M. NURUL ISLAM* AND HASEEB MD. IRFANULLAH1

 

Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh 
 

Key words: Desmids, acidic habitats, phytoplankton, new records 
 

Abstract 
 Fifty nine taxa of desmids under 17 genera, namely Cylindrocystis, Netrium, 
Spirotaenia, Gonatozygon, Penium, Closterium, Pleurotaenium, Triploceras, 
Triplastrum, Hyalotheca, Groenbladia, Bambusina, Teilingia, Sphaerozosma, 
Spondylosium, Onychonema and Desmidium have been recorded from different aquatic 
habitats located within the tea gardens at Srimangal, Maulvi Bazar. Eight taxa are 
described as new records for Bangladesh including two genera, namely, Cylindrocystis 
and Spirotaenia. 

 

Introduction 
 Recently, Islam and Irfanullah have described the aquatic macrophytes (Islam and 
Irfanullah 2000) and algae (excluding desmids) (Islam and Irfanullah 2005a, 2005b) of 
some selected habitats within the tea gardens at Srimangal, Maulvi Bazar. The present 
paper is the third installment of the same series and it records 17 desmid genera. 
 

Materials and Methods 
 For the description and meteorological data of the study area see Islam and Irfanullah 
(2000). The studied waterbodies, namely, Baraoora Lake, the Burburia River, ditches and 
paddy fields were mostly acidic (Islam and Irfanullah 2005). In the winter of 1996 (9 
January) and in different seasons of 1997 (winter, 6 January; spring, 18 March; rainy 
season, 20 July and autumn, 20 October), a total of 120 algal samples were collected. See 
Islam and Irfanullah (2005) for the sample collection methods, and their preservation and 
examination. 
 

Taxonomic enumeration  
 The present study reveals 59 taxa of desmids belonging to 17 genera of which eight 
taxa are newly recorded for Bangladesh (marked by * asterisks). Nonetheless, a few algal 
taxa have already been reported as new records by the same authors from this area (Islam 
and Irfanullah 1998, 1999), which are not marked in this account. 
 
*Corresponding author. 1IUCN - The World Conservation Union, Bangladesh Country Office, House 11, 
Road 138, Gulshan 1, Dhaka 1212. E-mail: hmirfanullah@yahoo.co.uk 

 



50 ISLAM AND IRFANULLAH 

Class: Chlorophyceae; Order: Zygnematales; Family: Mesotaeniaceae 
Genus: Cylindrocystis Meneghini ex Ralfs 1848 

1. *? C. brebissonii Meneghini (Pl. 3, Fig. 30) 
 (Scott and Prescott 1961, 1: 3) 
 L. 47.2 µm, W. 23 µm, t. 10.8–13.5 µm; two pyrenoids per cell. River; spring 1997; 

few. 
 

Genus: Gonatozygon  de Bary, 1858 
2. G. aculeatum Hastings (Pl. 5, Fig. 48) 
 (Smith 1924, 52: 3; Scott and Prescott 1961, 1: 7) 
 L. 250 µm, W. csp. 20–21.6 µm, W. ssp. 10.8–12 µm, t. ssp. 12–12.8 µm. Lake; 

winter 1997; common. 
 

3. G. kinahani (Archer) Rab. fa.  
 (Islam and Irfanullah 1999, 118, 1: 4) 
 Lake; autumn 1997; few. 
 

4. G. pilosum Wolle  (Pl. 5, Fig. 49) 
 (Růžička 1977, 1: 15–16) 
 L. 262 µm, W. csp. 13.5 µm, W. ssp. 12 µm, t. 12 µm. Lake; winter 1997; few. 
 

Genus: Netrium (Näg.) Itz. & Rothe in Rab., 1856 
5. N. digitus (Ehr. ex Ralfs) Itz. & Rothe var. lamellosum (Bréb.) Grönbl. 
 (Islam and Haroon 1980, 2: 27) (Pl. 5, Figs. 50–51) 
 L. (163)–211–346 µm, W. 39–64 µm, t. 19.2–25.6 µm. River; spring 1997; common. 
 

Family: Desmidiaceae; Genus: Spirotaenia de Brébisson, 1844 
6. *Spirotaenia sp. (Pl. 3, Fig. 31) 
 (Smith 1924, 5) 
 L. 86.4–143 µm, W. 13.5–16.2 µm; smooth cell wall; spiral chloroplast with 

pyrenoids. River; spring 1997; common. 
 

Genus: Penium Bréb. ex Ralfs in Ralfs, 1848 
7. P. spirostriolatum Barker (Pl. 3, Fig. 32) 
 (Scott and Prescott 1961, 1: 12) 
 L. 198 µm, W. 23 µm, I. 20.2 µm, t. 13.5 µm. Lake; winter 1997; rare. 
 

Genus: Triplastrum Iyengar & Ramanathan, 1942 
8. T. abbreviatum (Turner) Iyengar & Ramanathan (Pl. 1, Fig. 6) 
 (Islam 1980, 3: 36–41) 
 L. csp. 85.7 µm, L. ssp. 83.7 µm, W. 10.8 µm, I. 8.5 µm, t. 11.5–13.5 µm. Lake; 

winter 1996; rare. 



HYDROBIOLOGICAL STUDIES WITHIN THE TEA GARDENS IV 51 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
Plate 1 

Figs. 1-2. Desmidium aptogonum var. acutius, 3. D. swartzii var. ambloydon, 4. D. bengalicum, 5. D. baileyi 
var. baileyi, 6. Triplastrum abbreviatum, 7, 9. Hyalotheca dissiliens var. tatrica, 8. H. dissiliens var. 
hians. [Scales = 20 µm] 



52 ISLAM AND IRFANULLAH 

Genus: Triploceras Bailey, 1851 
9. T. gracile Bailey var. undulatum Scott & Prescott (Pl. 5, Fig. 47) 
 (Scott and Prescott 1958, 27, 3: 8)  
 L. csp. 624 µm, L. ssp. 608 µm, W. csp. 52 µm, W. ssp. 35 µm, I. 30 µm, t csp. 46 

µm, t. ssp. 40.5 µm. Lake (autumn 1997) and river (spring 1997); few. 
 

Genus: Closterium Nitzsch ex Ralfs, 1848 
10. Cl. angustatum Kütz. ex Ralfs (Pl. 2, Fig. 11) 
 (Islam 1970, 909, 4: 17; Islam and Haroon 1980, 558, 1: 14) 
 L. 192 µm, W. 13.5 µm, t. 6.7–8 µm.  Lake; winter 1997; rare. 
 

11. *Cl. closterioides (Ralfs) Louis and Peeters var. intermedium (Roy & Biss.) Růžičk  
 (Růžička 1977, 93, 6: 3–6) (Pl. 2, Fig. 18) 
 L. 109.3 µm, W. 23 µm, t. 8–9 µm; eight axial chloroplasts, smooth wall, pyrenoids 

were not clearly evident.  Lake; winter 1996 and 1997; rare to few. 
 

12. *Cl. dianae var. minus Hieron. (Pl. 2, Fig. 13) 
 (Růžička 1977, 135, 13: 10–12; as C. dianae var. minor Hieron. in Prescott et al. 

1975, 47, 23: 8) 
 L. 213 µm, W. 23 µm, t. 4.7 µm. Lake; winter 1997; rare. 
 

13. Cl. gracile Bréb. ex Ralfs (Pl. 2, Fig. 12) 
 (Prescott et al. 1975, 52, 16: 2; Růžička 1977, 168, 21: 1–4) 
 L. 416 µm, W. 17.5 µm, t. 5.4 µm; cell wall punctate. Lake; winter 1997; rare. 
 

14. Cl. jenneri Ralfs var. tenue Croasdale (Pl. 2, Fig. 15) 
 (Prescott et al. 1975, 56, 23: 2) 
 L. 97–103 µm, W. 9.4–12 µm, t. 4 µm. Lake (winter 1997; few) and river (spring 

1997; common). 
 

15. Cl. kuetzingii Bréb. var. vittatum Nordst. (Pl. 2, Fig. 21) 
 (Růžička 1977, 209, 30: 15–17) 
 L. 384 µm, W. 13.5 µm, t. 2.7 µm. Lake; winter 1996 and 1997; few. 
 

16. Cl. moniliferum (Bory) Ehr. ex Ralfs (Pl. 2, Fig. 14) 
 (Prescott et al. 1975, 70, 21: 3) 
 L. 115 µm, W. 16.2 µm, t. 4 µm. Lake; winter 1996 and 1997, and autumn 1997; few. 
 

17. Cl. pritchardianum Archer  (Pl. 2, Fig. 10) 
 (Prescott et al. 1975, 77, 25: 7, 14) 
 L. 528 µm, W. 35.2 µm, t. 8 µm. Lake; winter 1997; rare. 
 

 
 



HYDROBIOLOGICAL STUDIES WITHIN THE TEA GARDENS IV 53 

 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Plate 2 
Figs. 10. Closterium pritchardianum, 11. Cl. angustatum, 12. Cl. gracile, 13. Cl. dianae var. minus, 14. Cl. 

moniliferum, 15. Cl. jenneri var. tenue, 16-17. Cl. striolatum var. subtruncatum, 18. Cl. closterioides var. 
intermedium, 19. Cl. tumidum, 20. Cl. ralfsii var. hybridum, 21. Cl. kuetzingii var. vittatum. [Scales =     
30 µm]. 



54 ISLAM AND IRFANULLAH 

18. Cl. ralfsii de Bréb. var. gracilius (Maskell) Krieger (Pl. 5, Fig. 58) 
 (Růžička 1977, 191, 25: 9) 
 L. 143 µm, W. 5.4 µm, t. 2 µm. Lake; winter 1997; few. 
 

19. Cl. ralfsii var. hybridum Rab. (Pl. 2, Fig. 20) 
 (Růžička 1977, 192, 25: 10–13) 
 L. 352 µm, W. 28.8 µm, t. 6.7 µm. River; spring 1997; few. 
 

20. * Cl. rectimarginatum Scott & Prescott  (Pl. 5, Fig. 57) 
 (Scott and Prescott 1961, 13, 1: 27–28) 
 L. 189 µm, W. 23 µm, t. 4 µm. River; spring 1997; rare. Note: it is somewhat similar 

to C. subfusiforme (see Prescott et al. 1975, 14: 11). 
 

21. Cl. rostratum Ehr. var.  rostratum (Pl. 5, Fig. 59) 
 (Prescott et al. 1975, 83, 31: 3, 12) 
 L. 243 µm, W. 20.2 µm, t. 5.4 µm. Lake; winter 1996; rare. 
22. *Cl. striolatum var. subtruncatum (W. & W.) Krieger (Pl. 2, Figs. 16–17) 
 (Prescott et al. 1975, 89, 27: 5 & 28: 7; Růžička 1977, 218, 32: 12–14) 
 L. 192–195 µm, W. 21.6–24.3 µm, t. 9.4–12.2 µm; 5-8 striations per 10 µm. Lake 

(autumn 1997) and river (spring 1997); few. 
 

23. Cl. tumidum Johnson (Pl. 2, Fig. 19) 
 (Islam and Akter 1999, 26, 2: 27) 
 L. 127 µm, W. 21.6 µm, t. 5.4 µm; six axial chloroplasts per semicell. Paddy field; 

autumn 1997; few. 
 

Genus: Pleurotaenium Nägeli, 1849 
24. Pl. ehrenbergii (Bréb.) de Bary var. ehrenbergii (Pl. 4, Fig. 37) 
 (Prescott et al. 1975, 114, 45: 1–5) 
 L. 230 µm, W. 21.6 µm, I. 14.8 µm, t. 13.5 µm. River; spring 1997; rare. 
 

25. Pl. ehrenbergii var. elongatum West (Pl. 4, Fig. 40) 
 (Prescott et al. 1975, 117, 46: 1–3) 
 L. 270 µm, W. 12–13.5 µm, I. 9.4 µm, t. 9.4–10 µm. Lake; winter 1996; rare. 
 

26. Pl. ehrenbergii var. undulatum Schaars. (Pl. 4, Fig. 41) 
 (Islam 1970, 913, 4: 15; Prescott et al. 1975, 117, 46: 5, 6, 18) 
 L. 512 µm, W. 54.4 µm, t. 41.6–43.2 µm. Paddy field; autumn 1997; rare. 
 

27. Pl. kayei (Archer) Rab. (Pl. 4, Figs. 42–43) 
 (Islam and Haroon 1980, 562, 4: 54–55) 
 L. 275–320 µm, W. csp. 56.7–67.5 µm, W. ssp. 44.5–54 µm, I. 32.4 µm, t. csp. 38–

40.5 µm, t. ssp. 28 µm. Lake (autumn 1997; few) and river (winter 1997; common). 
 



HYDROBIOLOGICAL STUDIES WITHIN THE TEA GARDENS IV 55 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
Plate 3 

Figs. 22. Pleurotaenium verrucosum var. validum, 23. Pl. trochiscum, 24. Pl. trabecula fa., 25. Pl. trabecula 
var. crassum, 26. Pl. trabecula var. elongatum, 27. Pl. nodosum var. borgei, 28–29. Pl. nodosum var. 
gutwinskii, 30. ? Cylindrocystis brebissonii, 31. Spirotaenia sp., 32. Penium spirostriolatum [Scales = 
20 µm]. 



56 ISLAM AND IRFANULLAH 

28. Pl. kayei var. ovoideum Islam and Haroon (Pl. 4, Fig. 44) 
 (Islam and Haroon 1980, 562, 5: 77) 
 L. 243 µm, W. csp. 71.5 µm, W. ssp. 56.7 µm, I. 37.8 µm, t. csp. 40.5 µm, t. ssp. 25.6 

µm. Paddy field; autumn 1997; rare. 
 

29. Pl. nodosum (Bail.) Lund. var. borgei (Grönbl.) Krieger  (Pl. 3, Fig. 27) 
 (Islam 1970, 914, 5: 15; Prescott et al. 1975, 125, 44: 6–9) 
 L. 248–346 µm, W. 49–50 µm, I. 23 µm, t. csp. 23–29, t. ssp. 20.2–21.6 µm. Lake 

(winter 1997; few) and paddy field (autumn 1997; rare). 
 

30. Pl. nodosum var. gutwinskii Krieger (Pl. 3, Figs. 28–29) 
 (Prescott et al. 1975, 126, 44: 10; Islam and Haroon 1980, 562, 5: 86) 
 L. 232–313 µm, W. 51–86 µm, I. 23–43 µm, t. csp. 24–41 µm, t. ssp. 22–34 µm; band 

present at the isthmus, 10–12 nodules on the basal ring, 12 spines at each semi-cell 
tip. Quite robust and slightly differs from the typical. Paddy field; autumn 1997; rare. 

 

31. Pl. subcoronulatum (Turn.) W. & W. (Pl. 4, Figs. 38–39) 
 (Scott and Prescott 1961, 132, 49: 2–4, 10; Islam 1970, 914, 4: 1–2) 
 L. 740 µm, W. 47 µm, I. 41 µm, t. 39 µm; cell wall pitted. Lake; winter 1996; few. 
 

32. Pl. trabecula (Ehr.) Näg. (Pl. 4, Figs. 33–34) 
 (Prescott et al. 1975, 133, 40: 1–5) 
 L. 550–660 µm, W. 38–44.5 µm, I. 24.3–28.3 µm, t. 24.3–28.3 µm. River; spring 

1997; few. 
 

33. Pl. trabecula var. crassum Wittr. (Pl. 3, Fig. 25) 
 (Prescott et al. 1975, 134, 40: 14) 
 L. 160 µm, W. 25 µm, I. 22.5 µm, t. 14 µm. Paddy field; autumn 1997; rare. 
 

34. Pl. trabecula var. elongatum Cedergren (Pl. 3, Fig. 26; Pl. 4, Fig. 36) 
 (Prescott et al. 1975, 134, 40: 10–11) 
 L. 162–167 µm, W. 7–9.6 µm, I. 5.4–7.8 µm, t. 4.8–5.4 µm. Lake; winter 1996; 

common. 
 

35. Pl. trabecula var. maximum (Reinsch) Roll fa. constrictum Scott & Presc. 
 (Scott and Prescott 1961, 18, 3: 11) (Pl. 4, Fig. 35) 
 L. 570 µm, W. 40.5 µm, I. 31 µm, t. 25.6 µm. Lake; winter 1996; few. 
 

36. Pl. trabecula fa. (Pl. 3, Fig. 24) 
 L. 307–320 µm, W. 30–31 µm, I. 26 µm, t. 17.5–19 µm; one band at the isthmus. 

River; spring 1997; very rare. 
 

37. Pl. trochiscum W. & W. (Pl. 3, Fig. 23) 
 (Prescott et al. 1975, 136, 50: 9–12) 
 L. 448 µm, W. 32.4 µm, I. 28.8 µm, t. 22.4 µm. Lake; winter and rainy 1997; rare to 

few. 



HYDROBIOLOGICAL STUDIES WITHIN THE TEA GARDENS IV 57 

 
 
 
 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
 

Plate 4 
Figs. 33–34. Pleurotaenium trabecula, 35. Pl. trabecula var. maximum fa. constrictum, 36. Pl. trabecula var. 

elongatum, 37. Pl. ehrenbergii var. chrenbergii, 38–39. Pl. subcoronulatum, 40. Pl. ehrenbergii var. 
elongatum, 41. Pl. ehrenbergii var. undulatum, 42–43. Pl. kayei, 44. Pl. kayei var. ovoideum, 45. 
Spondylosium sp., 46. Sphaerozosma aubertianum  [Scales = 20 µm]. 

 



58 ISLAM AND IRFANULLAH 

38. * Pl. verrucosum (Bail.) Lund. var. validum Scott and Grönbl. (Pl. 3, Fig. 22) 
 (Prescott et al. 1975, 139, 51: 1) 
 L. 275 µm, W. 41.8–58 µm, I. 29.7 µm, t. 23 µm. River; spring 1997; rare. 
 

Genus: Hyalotheca Ehrenberg ex Ralfs, 1848 
39. H. dissiliens (Smith) Bréb. var. hians Wolle (Pl. 1, Fig. 8) 
 (Croasdale et al. 1983, 29, 461: 2–3) 
 L. 12–19 µm, W. 21.6 µm, I. 16.2–17.5 µm. Lake; winter 1997; few. 
 

40. H. dissiliens var. tatrica Racib. (Pl. 1, Figs. 7, 9) 
 (Croasdale et al. 1983, 29, 461: 4) 
 L. 12–19 µm, W. (10.8–12.8)–21.6 µm, I. (10.2)–16.2–17.5 µm. Lake (winter 1996 

and 1997; rare to common) and river (spring 1997; common). 
 

41. H. mucosa (Mert.) Ehr. ex Ralfs 
 (Islam and Irfanullah 1999, 122, 1: 3) 
 Lake (autumn 1997; few) and river (spring 1997; common). 
 

Genus: Groenbladia Teiling, 1952 
42. G. neglecta (Racib.) Teiling  
 (Islam and Irfanullah 1998, 93, Figs. 1–3) 
 Lake (winter 1997) and river (spring 1997); common. 
 

43. G. undulata (Nordst.) Förster 
 (Islam and Irfanullah 1998, 95, Figs. 4–5) 
 Lake; autumn 1997; few. 
 

Genus: Bambusina Kützing ex Kützing, 1845 
44. B. brebissonii Kütz. var. brebissonii (Pl. 5, Fig. 54) 
 (Islam 1970, 934, 3: 9–10) 
 L. 24.3–27 µm, W. 16.2–19 µm, t. 12 µm. Lake (winter 1996; rare), river (spring 

1997; common) and paddy field (autumn 1997; few). 
 

Genus: Teilingia Bourrelly, 1964 
45. T. exigua (Turner) Bourrelly 
 (Islam and Irfanullah 1999, 122, 1: 11) 
 Lake; autumn 1997; few. 
 

Genus Sphaerozosma Corda ex Ralfs, 1848 
46. *S. aubertianum West, W.    (Pl. 4, Fig. 46) 
 (Croasdale et al. 1983, 2, 448: 1-5) 
 L. 10.8 µm, W. 12-13.5 µm, I. 6.7 µm; a fine horizontal row of pores across the 

middle of the semicell; mucilage strand from the pore appearing as granules on the 
lateral margins.  Lake; autumn 1997; common.  

 



HYDROBIOLOGICAL STUDIES WITHIN THE TEA GARDENS IV 59 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
 
 
 
 
 

Plate 5 
Figs. 47. Triploceras gracile var. undulatum, 48.  Gonatozygon aculeatum, 49. G. pilosum, 50–51. Netrium 

digitus var. lamellosum, 52. Onychonema laeve var. laeve, 53. O. laeve var. micracanthum, 54. 
Bambusina brebissonii var. brebissonii, 55. Spondylosium javanicum var. javanicum, 56. S. planum var. 
planum, 57. Closterium var. rectimarginatum, 58. Cl. raflsii var. gracilius, 59. Cl. rostratum var. 
rostratum [Scales, Figs. 47–51 = 30 µm, Figs. 52–59 = 20 µm]. 



60 ISLAM AND IRFANULLAH 

Genus: Spondylosium Brébisson ex Kützing, 1849 
47. S. javanicum (Gutw.) Gronblad var. javanicum   (Pl. 5, Fig. 55) 
 (Croasdale et al. 1983, 19, 457: 14-15; Scott and Prescott 1961, 121, 60: 10 as S. 

nitens (Wall.) Arch. var. triangulare Turner fa. javanicum Gutw.). 
 L. 27 µm, W. 24.3 µm, I. 6.7 µm. Lake; winter 1996; common. 
 

48. S. panduriforme (Heim.) Teil. 
 (Islam and Irfanullah 1999, 122, 1: 5–9) 
 Lake; autumn 1997; common. 
 

49. S. panduriforme var. panduriforme fa. limneticum (W. & W.) Teil. 
 (Islam and Irfanullah 1999, 122, 1: 10) 
 Lake; winter 1996 (few) and spring 1997 (common). 
 

50. S. planum var. planum (Wolle) W. & W.  (Pl. 5, Fig. 56) 
 (Croasdale et al. 1983, 21, 456: 6–7) 
 L. 8 µm, W. 4 µm, I. 2.7 µm, t. 2.7 µm. Paddy field; autumn 1997; few. 
 

51. Spondylosium sp. (Pl. 4, Fig. 45) 
 L. 24.3–26.3 µm, W. 28.3–30.4 µm, I. 7.4 µm; warts present on the tips of the arms 

and at the poles. Lake; autumn 1997; rare. 
 

Genus: Onychonema Wallich, 1860 
52. O. laeve Nordst. var. laeve (Pl. 5, Fig. 52) 
 (Croasdale et al. 1983, 13, 452: 6–10) 
 L. cpr. 28.3–31 µm, L. spr. 18.2–21.6 µm, W. csp. 27.7–35.8 µm, W. ssp. 21.6–31 

µm, I. 3–8 µm. Lake; winter 1996; rare. 
 

53. O. laeve var. micracanthum Nordst. (Pl. 5, Fig. 53) 
 (Croasdale et al. 1983, 14, 453: 7–9) 
 L. 14.8 µm, W. csp. 22.3 µm, I. 6 µm. Paddy field; autumn 1997; rare. 
 
 

Genus: Desmidium Agardh, 1848 
54.  D. aptogonum Bréb. ex Kütz. var. acutius Nordst. (Pl. 1, Figs. 1–2) 
 (Croasdale et al. 1983, 39, 463: 7–8) 
 L. 16–19 µm, W. 28.3–35 µm, I. 19–28.3 µm, t. 11.3–24.3 µm. Lake; winter 1996; 

common. 
 

55. D. baileyi (Ralfs) Nordst. var. baileyi (Pl. 1, Fig. 5) 
 (Croasdale et al. 1983, 41, 464: 8–9) 
 L. 21 µm, W. 21.6–23 µm, t. 21.6–23 µm; zygospore dimension 27–29.7 µm X 19–

21.6 µm. Lake; winter 1996; common. 
 



HYDROBIOLOGICAL STUDIES WITHIN THE TEA GARDENS IV 61 

56. D. baileyi fa. tetragonum Nordst. 
 (Islam and Irfanullah 1999, 120, 1: 1) 
 Lake; winter 1996; few. 
 

57. D. bengalicum Turner (Pl. 1, Fig. 4) 
 (Scott and Prescott 1961, 124, 62: 12–13; Islam 1970, 934, 2: 7 & 7: 6) 
 L. 19 µm, W. 28.3–29.7 µm, Ist. 20.2–21.6 µm, t. 12 µm; zygospore 17.5–19 µm × 

17.5–21 µm. Colonies are embedded in mucilage with ray-like deposition but no 
spines. River; winter and spring 1997; few to common. 

 

58. D. quadrangulatum Ralfs 
 (Islam and Irfanullah 1999, 122, 1: 2) 
 Lake; winter 1996; few. 
 

59. D. swartzii var. ambloydon (Itz.) Rab. (Pl. 1, Fig. 3) 
 (Islam 1970, 934, 2: 8–9; Croasdale et al. 1983, 49, 468: 5–10) 
 L. 16.2 µm, W. 35 µm, I. 29.7–31 µm, t. 24.3 µm. Lake; winter 1997; rare. 
 

Acknowledgements 
 We are grateful to A.F.M. Badrul Alam, the then Director, Bangladesh Tea 
Research Institute (BTRI), Srimangal, for providing the logistic, laboratory and other 
support during this study and also to all his colleagues who extended their help in the 
laboratory and in supplying necessary information. Thanks also due to James Finley & 
Co.  for the permission to sample its aquatic habitats. 
 

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Islam, A.K.M. Nurul 1970. Contributions to the knowledge of desmids of East Pakistan. Part I. 
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Islam, A.K.M. Nurul and Irfanullah, H.M. 1999. New records of desmids for Bangladesh. II. 
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Smith, G.M. 1924. Phytoplankton of the Inland Lakes of Wisconsin. Part II. Desmidiaceae. 
Wisconsin Geol. & Nat. Hist. Surv. Bull. 57(Part II): 1-227, pls. 52-88 + text figs. 1-17. 

 

 


	A. K. M. NURUL ISLAM* AND HASEEB MD. IRFANULLAH1
	Introduction