186 BEITISH DESMIDIACE^E. 



semicells somewhat tliree-lobed, lobes short, snbrect- 

 angular with rounded angles, apical lobe widest, apex 

 straight or slightly convex, incisions between lobes 

 wide and shallow. Side view of semicell broadly sub- 

 elliptic. Vertical view elliptic, ratio of axes about 

 1 : 2. Cell- wall smooth. Chloroplasts axile with one 

 pyrenoid. 



Zygospore unknown. 



Length 20-23 /*; breadth 13-20 p.; breadth of 

 isthmus 3*8-4*4 p; thickness 6-7*5 JJL. 



EXGLAXD.- -Bowness, Westmoreland ! New Forest, 

 Hants ! 



SCOTLAND.- -Corbie Loch north, and Springhill west 

 of Aberdeen ; Loch of Lum^air near Stonehaven, 

 Kincardine ; Buchanty in Fowlis Wester, Perth (Roy 

 fy Bissett). Hoy, Orkneys ! Xear Scalloway, Shetlands ! 



IRELAND.- -Cloonee Lough, Kerry! 



Geogr. Distribution. France. Germany. Hungary. 

 X. Eussia. Poland. Norway. Sweden. New Zealand. 



e/ 



Madagascar. Central and E. Africa. Brazil. 



o 



This species should be compared with C. Pokornyanum. 



40. Cosmarium granatum Breb. 

 (PL LXIII, figs. 1-3.) 



Cosmarium granatv.m Breb. in Ealfs' Brit. Desm. 1848, p. 96, t. 32, f . 6 ; 

 Breb. Liste Desrn. 1856, p. 126 ; Arch, in Pritch. Infus. 1861, p. 732 ; 

 Eabenli. Flor. Europ. Alg. Ill, 1868, p. 162 ; Xordst. Desin. Arctose, 

 1875, p. 19 ; Kirchn. Alg. Schles. 1878, p. 147 ; Wolle, Desm. U. S. 1884, 

 p. 60, t. 50, f. 13 ; Cooke, Brit. Desm. 1886, p. 83, t. 36, f. 9 ; Hansg. 

 Prodr. Algenfl. Bohm. 1888, p. 192 ; Boldt, Desmid Gronland, 1888, 

 p. 12 ; Xordst. Bornh. Desrn. 1888, p. 198 ; Freshw. Alg-. X. Zeal. 1888, 

 p. 56 ; De Toni, Syll. Alg. 1889, p. 931 ; West, Alg. X. Wales, 1890, 

 p. 288 ; Heimerl, Desm. alpin. 1891, p. 596 ; Borge, Bidr. Siber. Clilor. 



1891, p. 12 ; Chlor. Xorska Finmark. 1892, p. 12 ; West, Alg. W. Ireland, 



1892, p. 143 ; Alg. Eng. Lake Distr. p. 724 ; Eoy & Biss. Scott. Desm. 

 1894, p. 102 ; West & G. S. West, Alg. Madag. 1895, p. 54 ; Xordst. 

 Index Desm. 1896, p. 133 ; West & G-. S. West, Wehv. Afric. Freshly. 

 Alg. 1897, p. 113 ; Alg. S. England, 1897, p. 485 ; G. S. West, Alga-fl. 

 Cambr. 1899, p. 115 ; West & G. S. West, Alga-fl. Yorks. 1900, p. 78; 

 Alg. X. Ipeland, 1902, p. 32 ; Freshw. Alg. Ceylon, 1902, p. 162 ; Scott. 

 Freshw. Plankton, I, 1903, p. 526 ; Further Coiitrib. Freslnv. Plankton 

 Scott. Lochs, 1905, p. 484. 



Didymidium (Cosmarium} granatum Eeiiisch, Algenfl. Frank, 1867, p. 109. 

 Cosmarium granatum Breb. a. typicnm Klebs, Desm. Ostpreiiss, 1879, p. 32. 

 Euastrum (Cosmarium) granatum Gay, Monogr. loc. Conj. 1884, p. 59. 



