52 BRITISH DESMIDIACE.E. 



. Yorks) ! Lancashire! Cheshire (Roy). Leicester- 

 shire (Roy). Warwick (Wills). Gloucester (Ralfs). 

 Surrey! (Rolfs). Sussex (Ralfs). Hants! (Ralfs). 

 Devon! Cornwall! (Ralfs). 



WALES. General and abundant (up to 2,700 ft. on 

 Grlyder Fawr, Carnarvonshire) ! 



SCOTLAND. General and abundant ! (Roy fy Bissett). 

 Up to 3,500 ft. on Lochnagar ! Outer Hebrides ! 

 Orkneys ! Shetlands ! 



IRELAND. Abundant ! 



Geogr. Distribution. France. Germany. Galicia 

 and Austria. Hungary. Italy. Portugal. Norway. 

 Sweden. Denmark. Bornholm. Finland. N. and 

 S. Russia. Faeroes. Iceland. Nova Zembla. Spitz- 

 bergen. Greenland. Siberia. India. Ceylon. Siam. 

 Singapore. Australia. Xew Zealand. Madagascar. 

 Central and E. Africa. Sandwich Islands. United 

 States. W. Indies. Brazil. Patagonia. 



E. binale is generally distributed all over the British Islands, 

 and numerous varieties of it exist. The semicells of tJte type- 

 form possess rounded and entire basal angles, and the apex is 

 truncate and slightly retuse-emarginate in the middle. Forms 

 of E. binale should never be confused with forms of E. elegans 

 on account of the very different apices. In E. elegans the 

 apex is broadly rounded with a deep median incision, but in 

 E. binale the apex is truncate and retuse in the middle. 



Forma minor West. 



E. binale forina minor West, Desm. Maine, 1888, p. 340; Desm. Mass. 

 1889, p. 19, t. 3, f . 24 ; Alg. N. Wales, 1890, p. 288 ; Alg. W. Ireland, 

 1892, p. 140 ; West & G. S. West, Alg. S. England, p. 484. 



Cells very minute, about half the average size of the 

 type. 



Length 10-12 p.; breadth 7'5-ll (rarely to 12) p. 

 ENGLAND. --Adel Bog, W. Yorks, and Pilmoor, X. 



Yorks ! Puttenham Common, Surrey ! 



f 



WALES. Capel Curig, Carnarvonshire ! Ffestiniog, 

 Merioneth ! 



IRELAND. Xot uncommon ! 



Geoc/r. Distribution. United States. 



