195 



SCOTLAND.- -Near Locli Inver, Sutherland; near 

 Loch Coruisk in Skye, Inverness ; Ben-na-chie, 

 Morven, Birse, and Aboyne, Aberdeen ; Perth ! ; near 

 Corrie, Arran (//<>// $* 7>/*.sr/f). Near Lerwick, Shet- 

 land s ! 



IRELAND.- -Lough Anna and Sproule's Lough, Done- 

 gal ! Ballynahinch, and Loughs Creggan, Derryclare, 

 Letereen, and Shannacloontippen, Gralway ! Adrigole, 

 Kerry ! Lough Derryadd, Armagh ! 



Geoyr. Distribution.- -Germany. G-alicia in Austria. 

 Norway. Japan (var.). W. Africa. United States. 



Brazil. Argentina. 



~ 



C. gcdfritum somewhat resembles C.Lundelliivar. ellipticum, 

 but the semieells are mere pyramidate, the poles of the 

 vertical view are not so pointed, and in size it is a little 

 smaller. It is a Cosmarium which in the British Islands is 

 constantly associated with C. tetragonnm, C. speciosum, C. 

 notabile, C. ocJithodes, and other upland species. 



45. Cosmarium pseudonitidulum Nordst. 

 (PL LXIII, fig. 26.) 



Cosmarium pseudonitidulum Nordst. Norges Desm. 1873, p. 16, t. 1, f . 4 ; 

 Wolle, Desm. U.S. 1884, p. 62, t. 18, f. 19 ; Cooke, Brit. Desm. 1886, 

 p. 87, t. 42, f . 15 [figures bad] ; De Toni, Syll. Alg. 1889, p. 973 ; West, 

 Alg. N. Wales, 1890, p. 288 ; Alg. W. Ireland, 1892, p. 145 ; Eoy & Biss. 

 Scott. Desm. 1894, p 172 ; Nordst. Index Desm. 1896, p. 209 ; West & 

 G. S. West, Alga-n. Yorks. 1900, p. 78. 



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



Cells of moderate size, truncate-elliptic, about 1J 

 times longer than broad, deeply constricted, sinus 

 narrowly linear with a dilated extremity ; semieells 

 snbtrapezoid or triincate-pyramidate, basal angles 

 rounded, sides convex, at first suberect and then 

 gradually converging, upper angles rounded, apex 

 broadly truncate and very slightly convex. Side view 

 of semicell ovate-circular. Vertical view elliptic, ratio 

 of axes about 1 : 1/6. Cell- wall punctate. Chloro- 

 plasts axile, each with two pyrenoids. 



Zygospore unknown. 



