

202 



FRESH- WATER ALG^ FROM BURMA. 



Var. angulis lobi polaris non productis et acute rotundatis ; lobis lateralibus 

 integris, angulis inferioribus acute rotundatis et angulis superioribus 

 leviter productis et rotundato-conicis. 

 Long. 126,, ; 1st. 102^ ; lat. lob. polar. 70^ ; lat. isthtn. 26/,. 



Uxb.—Ntm saner, near Haipaw (No. 24193) 



(3> 



This variety is characterized by the entire condition of the lateral lobes and the broad polar 

 lobe, the lateral angles of which are not produced. The angles of both the lateral and polar lobes 

 are conical or even submamillate, but never truncate as in typical M, Mobil 



Genus : Cosmarium Corda 



79. Cosmarium obsoletum (Hantzsch) Reinsch, 1867 ; Nordst. Alg. et Char. i, 



1880, p. 7, t. 1, f. 9 ; W. & G. S. West, Brit. Desm. ii, 1905, p. 133, 

 t. 56, f. 1-3. 

 Var. Sitvensk Gutw. Alg. Ins. Java, 1902, p. 594, t. 38, f. 39. 



Long. 60/i ; lat. 66/* ; lat. isthm. 31/*. 



Bab.— Springs on the river bank, Bhamo (No. 21501). Momauk, east of Bhamo 

 (No. 21551). 



80. 



Cosmarium disi'ersum Johnson, Rare. Desm. U. S. ii, 1895, p. 297, t. 240, 



f. 19. 



Forma truncata. (PL xv, fig. 17). 



Forma paullo major, apicibus semicellularum distincte truncatis. 



Long. 52/* ; lat. 50/* ; lat. isthm. 13*5/* ; crass. 25/*. 



# ff &.__Singaing, Kyaukse District (No. 22193). Manpwe, N. Shan States 

 (No. 22513). 





81. Cosmarium sublatereundatum. W. &. G. S. West, Alg. Madag. 1895, p. 



60, t. 6, f. 1. 



Forma lateribus semicellularum 6-7-undulato-crenatis, apice paullo angustioribus 

 et leviter 2-nndulatis. Pyrenoidibus binis. 



Long. 37/* ; lat. 34*5/* ; lat. apic. 15-15*5/* ; lat. isthm. 10/*. ; crass. 17/*. 

 (PI. xiii, fig. 13). 



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



This form should be compared with C. cyclicum var. Nordstedtii nob. 



82. Cosmarium contractum Kirchn. Alg. Schles. 1878, p. 147; W. & G. S. 



West, Brit. Desm. ii, 1905, p. 170, t. 61, f. 23-25, 34. 



.BaJ.-Mansang, near Hsipaw (No. 24193). In the Kan-gyi at Mudon (No. 24505). 



Forma apice semicellulse paullo elevatis, lateralibus minus rotundatis 

 Long. 27/*; lat. 19/*; lat. isthm. 4'5/*. (PI. xiv, fig. 1) 

 Hab.— Mansang, near Hispaw (No. 24193). 





