1 9 0 FRESH-WATER ALG^ PROM BURMA.
31. CYLINDUOCYSTIS DIPLOSPORA Luud. Deam. Suec. 1871, p. 83, t. 5, f. 7.
Var. MAJOR West, Alg. W. Ireland, 1892, p. 131, t. 90, f. 3; W. &
G. S. West. Brit. Dosm. 1904, p. 61, t. 4, f. 42, 43.
Long. 88-92^; 44-46;.; lat. constrict. 41-i2yx; (PI. xiii, fig. 1).
^ai.—Mansang near Hsipaw (No. 24193).
The Bwrmeso specimens were slightly smaller than the original British osamples, but were otherwise
Tery similar. Some individuals were enveloped in a large irregular mass of mucus.
Geous: Netrium (Niig.) W. & G. S. West.
32. NETKIUM DIGITUS (Ehrenb.) Itzigs. & Rothe in Rabenh. Alg. 1856, No. 508;
W. & G. S. West. Brit. Desm. I, 1904, p. CI, t. 6, f. 14-16.
//a5.—Between TbiDgan-nyi-naung and Kawkareik. In the side chanuel of a
(No. 24483).
Genus; Penium Bi^b.
33. PiiNiUM NAVICDLA Breb. Listo Desm. 1856, p. 146, t. 2, f. 37- W. & G.
S. West, Brit. Desm. 1904, p. 75, t. 7, f. 12-15, 19.
Long. 35-42/.; lat. 11-13^.
Springs on the river biink at Bhamo (No. 21501). In the Kan-gyi at
Mudon (No. «4505). Betweeu Thingan-Dyi-nauDg and Kawkareik. In side channp] ni
(No. 24483).
34. PENIUM CLEVEI Lund. Dijsm. Suec. 187I, p. 8S, t. 5, II,
Forma ELONGATA. [ PI. xiii, fig. 2).
Forma celluHs elongatis et paullo angustioribus.
Long. 128^; lat. £ 3 - 5 - 3 4 l a t . istlim. 30^.
IfaS.—Mansang near Hsipaw (No. 24193).
35. PENIUM ADELOCHONDRUM Elfv. Antecik. Finska Desm. 1881, p. 17, t. 1, f, 13-
Forma minor et. paullo brevior. '
Long. 26/i.; lat. 12/ij lat. apic. (Pl. xiii, fig. 15).
Bab.—l-a the Kangyi at Mudon (No. 24c05 ).
36. PENIUM CUCDRBITINUM Biss. Desm. Windermere, 1884, p. 197, t. 5, i 7'-
W. & G. S. West, Brit. Desm. 1904, p. 94, t. 9, f. 13, 14. ' ' ' ''
Var. SUBPOLYMORHIUM Nordst. Freshw. Alg. N. Zeal. 1888, p. 71 t 7 f 20-
W. & G. S. West, 1. c. p. 95, t. 9, f. 19, 20.
Forma cellulis loviter constrictioribus et apicibus latioribus.
Long. 78/i; lat. 38^; lat. isthm. 34^^. (PI. xni, fig. U).
Bal.—In swamp, Katha (No, 22677).
CLOSTERIUM.
Genus : Closterium Nitzsch.
37. CLOSTERIUM DIDYMOTOCUM Corda, 1835; Ralfs, Brit. Desm. 1848, p. 168,
t. 28, f. 7; W. & G. S. West, Brit. Desm. 1904, p. 116, t. 13, f. 1-5.
Forma minor; long. 204^; lat. 27;.; lat. apic. 12/^ (PI. xni, fig. 18).
l Z a J . _ I n the Kan-gyi at Mudon (No. 34505).
38. CLOSTERIUM DIAN^ Ehrenb. Infus. 1838, p. 92, t. 5, f. xvii, 1-6; W. &
G. S. West, Brit. Desm. 1904, p. 130, t. 15, f. 1-6.
Lat. 16ii.
i7a5.—Mansang near Hsipaw (No. 24193).
39. CLOSTERIUM INCURVUM Bv6h. Liste. Desm. 1856, p. 150, t. 2, f. 47; W. &
G. S. West, Brit. Desm. 1904, p. 136, t. 15, f. 28-30.
Lat. 10-1.5^; apicibus oOi^ inter se distantibus (PI. xiii, fig. 16).
^a}.—Momauk, east of Bhamo (No. 21551).
40. CLOSTERIUM VEHUS Klitz. Phyc. germ. 1845, p. 130; W. & G. S. West,
Brit. Desm. 1904, p. 137, t. 15, f. 15-20.
Var. cellulis minus curvatis, apicibus obtusioribus.
Lat. 7-8; apicibus o-i^i inter se distantibus (PI. xm, fig. 17).
S-flj—Mansang near Hsipaw (No. 24193).
The outer margin of this small form only occupied 138° of aro, the curvature of the cell
thus agreeing more nearly with that of CI. parvuhm Niig. than that of CL Venus. It is,
however, much smaller than any known forms of CI. parvulum and there are only two pyreuoids
in each chloroplast.
Wills has figured a Clodevium from Nova Zemhla {aide Wille, Ferskv. Alg. Nov. Semlj,
1874, p. 60, t. 14, f. 84) wliich he calls " CI. parvnlum Nag. forma." The oui-vature of his plant
is however, too gi'eat for CI. panuhim, the apices are also more rounded, and there are only
two pyrenoids in each chloroplast. Like the Burmese plant, its characters appear to be partly
those of CI. Venus, but the apices are more obtuse.
Another form very similar to the Burmese variety has bean described and figured by Borgo
from Brazil {vide Borge, Alg. erst. Begnell. Exped. I I . Desmid. 1803, p. 79, t. 1, f. 24), but it
is of much larger size. Raciborski has also figured a similar but slightly larger form from
Australia. (Eacib, Desmidyja Oiastonia, 1882, p. 3G2, t. 6, f. 65).
41. CLOSTERIUM PULCHELLUM W. & G. S. West, Desm. Singapore, 1897, p. 158,
t. 8, f. 8-9.
Var. BUEMENSE var. n. (PI. xiii, fig. 5).
Var, minus, cellulis diametro 6-7-plo longioribus, minus curvatis; membrana
achroa.
Long. 38-58/t; lat. 7-8-5//; lat. apic. circ. 2-3-7^.
Mansang near Hsipaw (No. 24193). In swamp, Katha (No. 22677).
AHN. ROY. BOT. ÜARD. OALCETTA VOL. T I.