194 



FRESH-WATEE ALG2E FROM BURMA. 



Long. 242/* ; lat. 20/* j lat. apic. 5/*. (Pi. xiii, fig. 20). The number of striolations 



visible across the cell was 17. 



jl a l t — Springs on the river bank at Bhamo (No. 21501) 



Var. breve var. n. 



Var. multe brevior, minus attenuata polos versus. 





Long. 140-161/*; lat. 22-25/*; lat. apic. 7-8-5/*. 



Ilab. — Between Thingan-nyi-naung and Kawkareik, in the side channel of 

 stream (No. 24483). 



a 



51. Closterium Kutzingii BreT). Liste Desm. 1856, p. 156, t. 2, f. 40 • W. & 



G. S. West, Brit. Desm. i, 1904, p. 186, t. 25, f. 6-11. 



Hab.— Between Thingan-nyi-naung and Kawkareik, in the side-channal of a stream 



(No. 24483). 



52. Closterium rostratum Ehrenb., 1832 ; Ralfs, Brit. Desm. 1848 p 175 



t. 30, f. 3. ' 



Uab.— Momauk, east of Bhamo (No. 21551). 



53. Closterium setaceum Ehrenb.,' 1834; W. & G. S. West, Brit Desm i 



1904, p. 190, t. 26, f. 9-13. . ' 



JM.-Kyauktaga in the Pegu district (No. 22124). Mansang near Hsipaw 



(No. 24193). 



Genus: Pleurotcenium Nag. 



54. Pleurotcenium ovatum Nordst. Alg. Brasil. 1877 p. 18. 



Docidium ovatum Nordst. Desm. Brasil. 1870, p. 205 t. 3 f. 37 



Var. tumidum Mask. Further Notes N. Zeal. Desm. 1889, p. 29, t. 6 f 54- 



Long. 246-265/* ; lat. max. 96-102/*; lat. apic. 31-33/*; lat. isthm. 37-38'V (Fl 

 xiii, figs. 8, 9). r ^ ' 



ifak—Mansang near Hsipaw (No. 24193) 



nine 



When the cell becomes disarticulated into two semicells th« nWinn • .• 



and forms for a short distance part of the wall of the „Z, * TZ1 ^ ° S hkS S Wedge ' 

 shewing this overlapping area appears at first tht to be Sd^S ,!" ' ££ T^l 

 on eaoh side of the isthmns hid, PI rffl «. « Th . ; urnl9he<1 w '«" ■ downwardly-ourved hook 



L*mm r«»n«at« m Turn. (Freshw. A ,g. X^a '^V p ^ T, "ffW * Tu ™ r » 



appearanee fignred in a somewhat exaggerated manner Turn^, ' • ' ' ^' f ^ h ° 0k - lae 

 of this variety. Sgeratea manner, lurners species seems to be merely a form 



55. Pleueo 



trochiscum W. & G. S. West, Some N. Amer. Desm 



1896, 



Uao.—ln the Kangyi at Mudon (.No. 24505). 



