106 BRITISH DESMIDIACE^. 



110. Cosmarium Cucurbita Breb. 

 (PI. LXXIII, figs. 31-33 ; PL LXX1V, fig. 3.) 



Cosmarium Cucurbita Breb. in Desmazieres' PI. Crypt. France, fasc. 23, 

 18-41, no. 1103, cum fig. ; Ealfs in Ann. Mag. Nat. Hist. 1844, p. 395, 

 t. 11, f. 10; Ealfs, Brit. Desni. 1848, p. 108, t. 17, f. 7; Breb. Liste 

 Desni. 1856, p. 132 ; Arch, in Pritch. Infus. 1861, p. 735 ; Rabeiih. Flor. 

 Europ. Alg. Ill, 1868, p. 174 ; Lund. Desm. Suec. 1871, p. 51 ; Elfv. 

 Anteck. Finska Desm. 1881, p. 14 ; Arch, in Ann. Mag. Nat. Hist. ser. 5, 

 xvi, p. 145 ; West, Alg. W. Ireland, 1892, p. 162 ; Alg. Engl. Lake Distr. 

 1892, p. 729 ; Liitkem. Desm. Attersees, 1893, p. 549 ; Eoy & Biss. Scott. 

 Desm. 1894, p. 44 ; Nordst. Index Desm. 1896, p. 92 ; West & G. S. 

 West, Welw. Afric. Freshw. Alg. 1897, p. 176 ; Alg. S. England, 1897, 

 p. 492 ; Alga-fl. Yorks. 1900, p. 94 ; Liitkem. Desm. Millstattersees, 

 1900, p. 8 ; Borg. Freshw. Alg. Faroe's, 1901, p. 220 ; West & G. S. 

 West, Alg. N. Ireland, 1902, p. 41 ; Larsen, Freshw. Alg. E. Greenland, 



1904, p. 84 ; West & G. S. West, Freshw. Alg. Orkneys and Shetlands, 



1905, p. 23 ; Borge, Beitrage Alg. Schweden, 1906, p. 35. 

 Dysphinctiiim Cucurbita (Breb.) Grun. in Verhaiid. d. zool.-bot. Ges. 



Wien, 1858, p. 492 ; Eeinsch, Algenfl. Frank. 1879, p. 179 [in part] ; 



De Toni, Syll. Alg. 1889, p. 881 ; Turn. Freshw. Alg. E. India, 1893, 



p. 44 ; Schmidle, Beitr. Algenfl. Schwarzwald. u. Eheineb. 1893, p. 92 ; 



Lappmark Stisswasseralgen, 1898, p. 19. 

 Calocylindrus Cucurbita (Breb.) Kirchn. Alg. Schles. 1878, p. 143 ; Wolle, 



Desm. U. S. 1884, p. 54, t. 12, f. 14 ; Cooke, Brit. Desm. 1887, p. 125, 



t. 44, f. 7; Haiisg. Prodr. Algenfl. Bohm. 1888, p. 185; West, Alg. 



N. Whales, 1890, p. 291 ; Schmidt, Gruiidl. Algenfl. Luneburg. Heide, 



1903, p. 34. 

 Cosmarium Palangula Breb. var Debaryi Eabenh. Flor. Europ. Alg. Ill, 



1868, p. 174 [== C. Palangula De Bary, Conj. 1858, p. 72, t. 6, f. 51] ; 



Nordst. Alg. aq. dulc. et. Char. Sandvic. 1878, p. 13; Wille, Norges 



Ferskv. Alg. 1880, p. 37 ; West, Alg. W. Ireland, 1892, p. 162 ; Alg. 



Engl. Lake Distr. 1892, p. 729 ; Liitkem. Desm. Attersees, 1893, p. 549 ; 



Borge, Beitrage Alg. Schweden, 1906, p. 35. 

 Dysphinctium Debaryi Heimerl, Desm. alpiii. 1891, p. 593. 



Cells small, almost cylindrical, about twice as long 

 as broad, slightly constricted, shins a slight notch ; 

 semicells snbqnadrate, lateral margins subparallel and 

 very slightly convex, upper angles rounded, apex 

 convex or convex-truncate. Vertical view circular. 

 Cell-wall punctate. Chloroplasts axile, one in each 

 semicell, with a central pyrenoid and several very irre- 

 gular ridges. 



Zygospore globose and verrucose. 



Length 29-51 ju; breadth 15-24/x; breadth of 

 isthmus 14-21 ^ ; diam. zygosp. without warts 

 3037 /x. 



ENGLAND.- -Cumberland! Westmoreland! (Ealfs). 

 Lancashire ! W. and N. Yorks (up to 2000 ft., with 

 zygosporeson Whernside)! Cheshire (EaZ/V). Warwick! 



