182 15UITISH DESMIDIACE.E. 



ENGLAND. Cumberland ! Westmoreland ! (Biwtt). 

 Lancashire! (Rlfo). W., N., and E. Yorks ! Cheshire 

 (/i'<>//). Leicester (Ji <>//}. Essex! Cambridge! War- 

 wick (W/s). Surrey! Kent! Sussex (YiV//*) ; with 

 zygosp. (Jfinner). Hants! (Hoy). Devon! Cornwall! 

 (Rolfs); with zygosp. (Joshua). 



WALES. Carnarvon (Ru'lfs), Capel Curig ! (CWv-' ^ 

 II7//.S-), and Snowdon!, Carnarvonshire. Dolgelly, 

 Merioneth! (Ralfs). 



SCOTLAND. Sutherland!, Ross, Inverness, Aber- 

 deen!, Kincardine, Forfar, Perth! (Roy fy fiiwtt). 

 Harris, Outer Hebrides ! 



IEELAND. Donegal (with zygosp.) ! Mayo! Gal way! 

 Kerry! Dublin and Wicklow (Archer). Down! 

 Antrim ! 



Geof/r. Distribution. France. Belgium. Germany. 

 Austria and Galicia. Hungary. Italy. Norway. 

 Sweden. Denmark. Bornholm. N. and S. Russia. 

 Faeroes. Japan. India. Ceylon. Sumatra. Australia. 

 New Zealand. Central and E. Africa. United States. 

 Mexico. Brazil. Ecuador. 



This species is characterised by its relative length, its in- 

 curved extremities, its striated membrane, and its peculiar 

 double zygospore. The number of stria? varies considerably, 

 almost more than in any other species of striated Closterium, 

 but in all cases they are strong and well marked. 



Forma spirostriolata iwb. 



Cl. lineatum var. Ealfs, Brit. Desm. ISIS, p. 173. 



Cl. lineatum b. Forma striis lonyitudinalibus sftiralibus Ralx'iih. Flor. 

 Em-op. Algar. Ill, 1868, p. 130 ; Eoy & Biss. Scott. Desm. 1894., p. 24-G. 



Striae spirally disposed ; otherwise similar to the type. 

 SCOTLAND. Near Loch Dawan, Aberdeen (Roy fy 

 Bis sett). 



55. Closterium Ralfsii Brub. 

 (PI. XXIV, figs. 6, 7.) 



Closterium Ralfsii Breb. in Jemier's Flor. Tunbridge Wells, 1845, p. x ; 

 Bn'-b. in Ralfs' Brit. Dudui. 1848, p. 174, t. 30, f. 2 ; Arch, in Pritch . 



