6 BRITISH DESMIDLA.CE.aS. 



ENGLAND.- -Enbridge Lake, Hants (Roy). Sutton 

 Park, Warwickshire ! 



SCOTLAND. Loch Kinellan and Falls of Connon, 

 Ross ; Loch Ruthven, Inverness ; near Alford and 

 Cambus O'May, Aberdeen; Fife (Roy fy Bissett). 



Geoc/r. Distribution.- -France. Galicia in Austria. 

 Sweden. Bornholm. Finland. 



This variety differs from var. tumidum Wolle chiefly in the 

 clear space surrounding* the central granulated tumour. 



Var. emarginatum Hansg. (PI. GUI, fig. 8.) 



C. Botrytis var. emarginatum Hansg. Proclr. Algenfl. Bohm. 1888, p. 199 

 (c. fig. 116) ; Eoy & Biss. Scott. Desra. 1894, p. 44 ; Nordst, in Wittr. 

 & Nordst. Alg. Exsic. 1903, no. 1479 ; f asc. 35, p. 13 [forma] ; Teodoresco, 

 Mater, flor. alg. Rouman. 1907, p. 179. 



Semicells with a blunt notch (about 3 p. deep) in the 

 middle of the apex, causing an apical emargmation ; 

 granules rather larger than in the type, but other 

 characters and dimensions are the same. 



ENGLAND.- -Brent Reservoir, and in ditches at Kings- 

 bury Green, Middlesex ! Enbridge Lake, Hants (Roy). 

 Near Trimpley, Worcestershire ! 



SCOTLAND.- -Not uncommon on wet rocks (Roy $' 

 Bissett) . 



Geogr. Distribution. Germany. Galicia and Bohemia 

 in Austria. Roumania. Sweden. 



Var. mediolseve West. (PI. XCVII, fig. 5.) 



C. Sotrytis var. mediolseve West, Alg. W. Ireland, 1892, p. 155, t. 21, f. 12; 



West & G. S. West, Alg. S. England, 1897, p. 490; G. S. West, Alga-fl. 



Cambr. 1899, p. 218 ; West & G. S. West, Alga-fl. Yorks. 1900, p. 83 ; 



Schmidle in Simmer's Kryptogamenfl. der Kreiizeckgr. Karnten, 1901, 



p. 101 ; West & G. S. West, Alg. N. Ireland, 1902, p. 39. 

 C. subochthodes Schmidle, Weit. Beitr. Algenfl. Eheineb. xi. Schivarzwald. 



1895, p. 75 (in part), fig. 27 a and b [not fig. 26 a-c (=C. cymatopleurum 



var. tyrolicum)~] ; Schroder, Beitr. Algen Reisengebirges, 1898, p. 35, 



t. 1, f. 11 (?). 



Semicells with a smooth and faintly concave apex ; 

 granules arranged in radiating and concentric series, 

 gradually becoming smaller towards the centre of the 

 semicell which is quite smooth. Sides of vertical view 

 subparallel in the middle, and smooth. 



