44 BRITISH DESMIDIACE^E. 



Side view of semicell ovate-oblong, apex acutely 

 rounded, very slightly dilated on each side at the base. 

 Vertical view elliptic-oblong, poles acute, and with a 

 very slight swelling (sometimes absent) at the middle 

 on each side. 



Zygospore unknown. 



Length 26* 5-3 3 ft; breadth 19-21/>t; breadth of 

 isthmus 4-6 p.; thickness 10-12'5/x,. 



ENGLAND. Westmoreland! ~N. 9 W., and E. Yorks ! 

 Lancashire ! Lincolnshire ! Essex ! Wilts ! Surrey ! 

 Devon ! Cornwall ! 



WALES. Bogs above Capel Curig, Glyder Fach at 

 2,200 ft,, near Llyn Idwal, Y Foel Fras, and Rhyddu, 

 Carnarvonshire ! 



SCOTLAND. General! (Roy fy Bissett). Up to 3,500 ft. 

 on Loclmagar, Aberdeenshire ! Common in the Outer 

 Hebrides ! Orkneys ! Shetlands ! 



IRELAND. Donegal ! Mayo ! Gal way ! Kerry ! Dublin 

 and Wicklow (Archer). Down! 



Geogr. Distribution. France. Norway. Sweden. 

 Denmark. Italy. 



We gave full reasons for considering Euastrum erosum var. 

 notaljile as identical with E. lob/datum Breb. in the ' Journal 

 of Botany/ 1900, p. 290, and in the 'Alga-flora of Yorkshire/ 

 p. 63. We also think that E. lobulatum is correctly identified 

 with Nageli's E. dubium, which was described seven years 

 previously. Nageli's figures are not good, but there can be 

 no question that they represent the same plant as that 

 described and figured by Brebisson under the name of 

 E. lobulatum. 



It is a widely distributed species and is found in the boggy 

 districts of every part of the British Islands. 



It is easily distinguished from E. binale by its relatively 

 greater length, its equal tabulation at the sides, and by the 

 markings oil the semicells. 



Var. anglicamim (Turn.) nob. (PI. XXXVIII, fig. 9.) 



Euastrum anglicanum Turn. Desm. Notes, 1893, p. 343, fig. 6. 



Apex of semicells convexo-truncate, apical incision 

 open; with a few scattered granules within the lateral 



