COSMARIUM. 159 



and Yr Orsedd! , Carnarvonshire. Dolgelly, Merioneth 



(Ralfs). 



SCOTLAND.- -Ross, Inverness ! , Aberdeen, Kincardine, 

 Forfar ! , Perth ! , Argyll, Arran, Fife (Roy $ Bissett). 

 Sutherland ! Kirkcudbright ! 



IRELAND.- -Donegal! G-alway! Kerry! Dublin and 

 Wicklow (Arrln't']. 



Geocjr. Distribution. France. Belgium. Germany. 

 Austria (var.) and Galicia. Poland (var.). Hungary. 

 Bosnia. Italy. Norway. Sweden. Denmark. Born- 

 holm. X. and S.Russia. Siberia. Greenland. Faeroes. 

 Spitzbergen. India. New Zealand. Australia (form) . 

 Central and E. Africa. United States. Porto Rico. 



C. Phaseolus should be carefully compared with. C. depressum 

 (Xag.) Lund., C. subtumidum Nordst., and varieties of these 

 species. Apart from differences in the form of its semicells, 

 it can be distinguished at once by the small but prominent 

 protuberance on each side of the vertical view. 



A Voile observed the zygospore from the United States. 



It is a widely distributed species, but in the British Islands 

 it is distinctly rare. 



Forma minor Boldt. (PL LX, fig. 15.) 



C. Phaseolus forma minor Boldt, Siber. Chlorophy. 1885, p. 102; Desni. 

 Gronland, 1888, p. 15 ; West and G-. S. West, Alg. S. England, 1897, 

 p. 486. 



Cells smaller than in the typical form. 

 Length 20*4-21 p,; breadth 18/x,; breadth of isthmus 

 5*5-6 p.; thickness 11'5-14'4^. 



ENGLAND.- -Grrmspound, Devonshire ! 

 Geoyr. Distribution. Siberia, Greenland. 



Var. elevatum Xordst. (PI. LX, figs. 16, 17.) 



C. Phaseolus var. elevatum Nordst. Norges Desni. 1873, p. 17, t. 1, f . 5 ; 

 Desm. Arctose, 1875, p. 24; Wille, Sydamerik. Algfl. 1S84, p. 31 ; Boldt, 

 Siber. Chlorophy. 1885, p. 102; Hansg. Prodr. Algenfl. Bohm. 1888, 

 p. 251 ; Boldt, Desm. Gronland, 1888, p. 15 ; De Toni, Syll. Alg. 1889, 

 p. 1001 ; Schmidle, Beitr. Algenfl. Schwarzwald. 11. Rheineb. 1893, p. 102, 

 t. 5, f. 11 ; Eoy & Biss. Scott. Desm. 1894, p. 171 ; Schmidle, Beitr. alp. 

 Alg. 1895, p. 456 ; West & G. S. West, Alg. N. Ireland, 1902. p. 33. 



Semicells generally hexagonal-elliptic, apex truncate- 

 convex. 



