COSMAEIVM. 245 



C. speciosum there is scarcely any appreciable inflation at the 

 base of the semicells. 



209. Cosmarium pulcherrimum Xordst. 

 (PL LXXXVIII, fig. 9.) 



Cosmarium pulchefrimum Xordst. Desm. Brasil. 1870, p. 213, t. 3, f. 2-1; 



Lund. Desm. Siiec. 1871, p. 34 "forma" ; ? ? "VVolle, Desm. U. S. 1884, 



p. 90, t. 49, f. 25-27 : Schaarschm. Afsrtian. Alg. 1884, p. 246 ; Hanssf. 



Prodr. Algenfl. Bohm. 188S, p. 201 ; De Toni, Syll. Alg. 1889, p. 101K ; 



Borg. Desm. Brasil. 1890, p. 38 ; Roy & Biss. Scott. Desm. 1894, p. 172; 



Xordst. Index Desm. 1896, p. 211 ; Schmidle in Engler, Bot. Jahrbuch. 



xxx, 1901, p. 251. 



Ursinella pulcherrima Kuntze, Eevis. gen. plant. 1891, p. 925. 

 Cosmarium pulcherrimum a. typica Turn. Freshw. Alg. E. India, 1893, 



p. 73. 



Cells somewhat under medium size, about 1-J- times 

 as long as broad, elliptic in general outline, very deeply 

 constricted, sinus very narrowly linear; semicells semi- 

 elliptic, basal angles rectangular and slightly obtuse, 



1 O O t/ 



margin crenulate, crenations 18-20, those near the 

 basal angles being smaller than the rest, each dona- 

 tion furnished with a pair of very minute marginal 

 granules ; within the margin with 4 concentric series 

 of extremely minute granules, arranged in pairs, and 

 also in distinct radial series ; in the centre above the 

 isthmus with a small granulate tumour, granules small 

 and arranged in 5 vertical (and slightly converging) 

 series. Vertical view rather narrowly elliptic, granules 

 arranged in curved transverse series, and with a small 

 granulate tumour at the middle on each side. Chloro- 



o 



plasts axile, with two pyrenoids. 



Zygospore unknown. 



Length 45-51 p. ; breadth 32-34 p. ; breadth of 

 isthmus 7*6 //,; thickness 21 p. 



WALES.- -Grlydyr Fawr, Carnarvonshire 



SCOTLAND.- -Canlochan, Forfar (R<>ij 



Geotjr. Distribution.- -Germany. Galicia in Austria. 

 Hungary. Xorway (var.). Sweden. Russian Lap- 

 land. X. Russia. Xova Zembla. Spitzbergen (var.). 

 Greenland. Japan. Afghanistan. India. Sumatra 

 (var.). E. Africa. United States. Brazil. Argentina. 



