CLOSTERIUJI. 129 



yellow, striated, with 5-7 visible .striae across the cell, 

 ;nul with 4-7 pyrenoids in each chloroplast ; terminal 

 vacuoles elongated, with several moving granules. 



~ ~ o 



Zygospore globose and smooth. 



Length 110-ooO/x; breadth 4*5-8 /A; diam. zygosp. 



_ *J"T LL 



ENGLAND. Cumberland! Westmoreland! (Ralfx). 

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

 Leicester (-Roy). Warwick (Wills). Essex! Sussex! 

 (Iiiilfx*). Surrey! Hants! Cornwall I (Rolfs) ; zy go- 

 spores from Tintagel ! 



WALES. General in Carnarvonshire (at 2,200 ft. on 

 Glyder Facli) ! Dolgelly, Merioneth ! 



SCOTLAND. General! (I\<j $ JUxseff). Zygospores 

 from Fyvie, Aberdeen (Roy) ; and from Glas Meal, 

 Perth ! General in the Outer Hebrides ! Shetlands ! 



IRELAND. Mayo ! Galway ! Kerry ! Donegal ! 

 Dublin and Wicklow (Archer). Down ! Antrim ! 



Ge<Hjr. Distribution. -General in Europe. Greenland. 

 India. Java. Australia. East Africa. United States. 



In the outline of its cells this species very much resembles 

 CI. fjracile Breb. 



Var. brevier Roy. (PI. XIV, figs. 15, 16.) 



Cl. juncidum var. ft Ealfs, Brit, Dcsni. 184-8, p. 172, t. 29, f. 7. 



Cl. juncidum var. brcvior et robustior, Kabenh. Flor. Etirop. Algar. Ill, 



1868, p. 127. 

 Cl. juncidum var. brevior Roy, in Joiirn. Bot. 1890, p. 336 ; Borge Chlor. 



Norska Finmark. 1892, p. 14. 



Cells relatively broader than in the typical form, 

 12-20 times longer than their diameter. 



Length 150-275 /x; breadth 12-14 /x; diam. zygosp. 

 40-44^. 



ENGLAND. Midhurst, Sussex (Jeuurr <j - Ralfs). 



WALES. Dolgelly, Merioneth (Rctlfi). 



SCOTLAND. Much rarer than the typical form. 



Geof/r. Distribution. France. Austria. Finland. 

 United States. 



The striolations of this variety are sometimes very obscure 

 and liable to be ovei'looked. 



9 



