228 



FRF-H-WATER ALQJE FROM BURMA 



178. Pediastrum duplex Mey 



P. pertusum Kutz. Phyc. germ. 1843, p. 143 (in part). 

 P. Napoliensis Ralfs, Brit. Desm., 1848, p. 184, t. 31, f. 7. 

 Var. reticulatum Lagerh. Stockholms. Pediastr., etc., 1882, p. 56, t. 2, f. 1 

 Hab.— In the Kan-gyi at Mudon (No. 24505). 



Family: PR0T0C0CCACE£ (or AUTOSPOMOEJ;) 



Genus: Ccelastrum Nag. 





179. Oelastrum Cambricum Arch, in Quart. Journ. Micr. Sci. 1868, p. 65. 



C. pukhrtm Schmidle in Berichte Deutsch. Bot. Gesellsch, X, 1892, p. 206 

 t. 11, f. 1; Bofilin, Alg. erst. Regnell. Exped. I, Protococc, 1897, p. 35. 

 t. 2, f. 4-10. 

 JTab.— Mansang, near Hsipaw (No. 24193). 



Burkillia: gen. nov. 



Cellula3 laxe aggregatse coenobium subglobosum formantes ; cellulis 8-16- ? in 



coenobio unoquoque associatis, globosis vel subglobosis (rare ovoideis) ; membrana 

 cellulne uniuscuj usque valde et unilateraliter incrassata, cornu conicum acutum 

 leviter curvatum formante, cornibus cellularum omnium extrorsum directis; 



chromatophoris . . , . ? Propagatio fit gonidiis sphaericis immobilibus 8-32 qua? intra 

 cellulam matricalem oriuntur. 



180. Buukillia cornuta. sp. unica. (PI. xti, figs. 19-21). 



Character idem ac generis. 

 Diam. cell. 13-18 m; long. corn. 7-17 fi ; diam. coenob. 75-88/t; diam. gonid 



2'7-V 



Hab.~ Mansang, near Hsipaw (No. 24193). 



The cells of this genus are loosely arranged to form a coenobium of more or less spherical 

 shape, and each individual cell is furnished with a stout, oonical horn, which arises from a broad 

 base almost equal to the diameter of the cell. The horn is solid, and generally exhibits a striation 

 indicative of the layers of which it is constructed. It gradually arises by a thickening of that 

 surface of the cell-wall directed to the outside of the colony. 



Reproduction takes place by the formation of 8-32 small gonidia within the mother-cell. 



These are set free by the gradual dissolution of the mother-cell-wall, which becomes gelatinous. At 



this time the whole colony rapidly dissociates. The gonidia are non-motile, but their development 

 was not observed. 



A few instances were observed of what appeared to be a process of reproduction by budding 

 from the original mother-cell, but nothing definite could be ascertained from the preserved 

 One of these cells is figured on PL xn, fig. 21. 



exam 



The nearest genus to Burhillia is perhaps Schmidle's Lauterborniella (Schmidle, Beitr. Kenntniss 



Planktonalg, 1900, p. 149, t. 6, f. 2, 3), in which the coenobium consists 

 oell possessing two hon>like spines. 



four lunate cells 



