COSMARTUM. 39 



We have not yet seen this species, which Messrs. Roy and 

 Bissett state has only been observed on wet rocks. 



244. Cosmarium annulatum (Nag.) De Bary. 

 (PI. CII, figs. 13-15.) 



Dysphinctium (Calocylindnis) annulatum Nag. Gatt. einzell. Alg. 1849, 

 p. 110, t. 6 F ; Eeinseh, Algenfl. Frank. 1867, p. 181 ; Hansg. Prodr. 

 Algenfl. Bohm. 1883, p. 186 ; De Toni, Syll. Alg. 1889, p. 887 ; Heimerl, 

 Desm. alp. 1891, p. 59-4 ; Him, Desm. Finland, 1903, p. 14. 



Cosmarium annulatum (Nag.) De Bary, Conj. 1858, pp. 46, 72; Lund. 

 Desm. Suec. 1871, p. 46 ; Nordst. Desm. Arctose, 1875, p. 30; Alg. aq. 

 dulc. et Char. Sardvic. 1878, p. 14; Wille, Ferskv. Alg. Nov. Semlj. 

 1879, p. 49 ; Boldt, Siber. Chlor. 1885, p. 108 ; Desmid. Gronland, 1888, 

 p. 29 ; Borg. Desm. Brasil. 1890, p. 42 ; West, Alg. W. Ireland, 1892, 

 p. 157; W. & G. S. W est , ^ ew Brit - Freshw. Alg. 1894, p. 7, t. 2, f. 42; 

 Borg. Freshw. Alg. Ostgronl. 1894, p. 22 ; W. & G. S. West, Alg. S. 

 England 1897, p. 492 ; Bohlin, Flor. Algol, d'eau douce d'Acores, 1901, 

 p. 66 ; W. & G. S. West, Alg. N. Ireland, 1902, p. 42. 



Penium annulatum Arch, in Pritch. Infus. 1861, p. 51 ; Rabenh. Flor. 

 Europ. Alg. Ill, 1868, p. 122 ; Liitkemull. Desm. Attersees, 1893, p. 544. 



Calocylindrus annulatus Kirchn. Alg. Schles. 1878, p. 143 ; Cooke, Brit. 

 Desm. 1887, p. 122, t. 43, f. 15. 



Cells rather small, subcylindrical, 2-2^- times as long- 

 as broad, scarcely constricted, sinus not evident; semi- 

 cells rectangular, sides 4-5-undulate including the 

 apical angle, apex convexo-truncate, with 4-5 trans- 

 verse series of small nodules (5-6 in each series) 

 corresponding to the marginal undulations. Vertical 

 view circular, with about ] 4 marginal undulations (or 

 nodulations). Chloroplasts ....?, with two trans- 

 versely-disposed pyrenoids in each semicell. 



Zygospore unknown. 



Length 36-54 /x; breadth 16-23/x; breadth of 

 isthmus 14*5-21 /x. 



ENGLAND.- -Westmoreland (Bissett). Cornwall (Mar- 

 qua nd). Tintagel, Cornwall ! 



WALES.- -Llyn Cwlycl, Carnarvonshire ! 



SCOTLAND.- -Eoss, Aberdeen, Kincardine, and Perth 

 (Roy $ Bissett). Shetlands ! 



IRELAND. Nacoogarrow Lough, Galway! Carran- 

 tuohill, Kerry ! Adrigole, Cork ! Dublin and Wick 

 low (Archer). Slieve Donard, Down ! 



Geogr. Distribution. France. Germany. Austria 

 and Gralicia. Hungary. Italy. Norway. Sweden. 



