COSMARIUM. 263 



sometimes yellowish. Chloroplasts axile, with one 

 pyrenoid. 



Zygospore unknown. 



Length 40-58 //, ; breadth 28-38 p. ; breadth of apex 

 12-18/u,; breadth of isthmus 10' 5-1 5 p. ; thickness 

 17-22 ft. 



ENGLAND.- -Shipley G-len and Ingieton, W. Yorks ! 



SCOTLAND.- -Xear Tain, Eoss ; Glen. Urquhart, Inver- 

 ness (Roy fy Bissett). 



Geogr. Distribution. France. Germany. Galicia 

 in Austria. Italy. Norway. Poland. Argentina. 



This species should be compared with C. crenatum, C. sub- 

 notabile, and C. subcrenatum, from each of which it is dis- 

 tinguished by its general proportions, the form of its semi- 

 cells,, and its granulation. It occurs amongst mosses on 

 dripping rocks and in other well-aerated situations. 



219. Cosmarium subnotabile AVille. 

 (PI. XC, figs. 17, 18.) 



Cosmarium subnotabile Wille, Ferskv. Alg. Nov. Semlj. 1879, p. 36, t. 12, 

 f. 16; Ue Toni, Syll. Alg. 1889, p. 964; West, Alg. Engl. Lake Distr. 

 1892, p. 726 ; Nordst, Index Desm. 1896, p. 246 ; West & G. S. West, 

 Alga-fl. Yorks, 1900, p. 84. 



Ursinella siibnotabilis Kuntze, Revis. gen. plant. 1891, p. 925. 



Cells rather small, about 1-J- times as long as broad, 

 moderately constricted, sinus narrowly linear, with a 

 slightly dilated extremity ; semicells truncate pyrami- 

 date, basal angles subrectangular, sides convex and 

 5 6 -undulate, apical angles scarcely rounded, apex 

 truncate and faintly 4-undulate ; within the margin 

 with about two series of small granules, rather more 

 within the basal angles, and with one series (or more ?) 

 across the base of the semicell next the isthmus. Side 

 view of semicell broadly elliptic or subcircular-elliptic. 

 Vertical view elliptic. Chloroplasts axile, with two 

 pyrenoids. 



Zygospore unknown. 



Length 30-50 p. ; breadth 21-5-34 /x; breadth of 

 isthmus 11-15 x; thickness 16-26 x. 



