108 BRITISH DESMIDIACE.*:. 



IRELAND. Kyleniore, Galway ! Carrantuohill, Kerry! 

 Dublin and Wicklow (Arclicr}. 



Geogr. Distribution. France. Germany. Austria. 



' e/ 



Poland. Italy. Norway. Sweden. Java. Jnited 

 States. Brazil. 



Var. montana West & G. S. West. (PL X, figs. 



28, 29.) 



? Closterium ottusumliiTuid.. Desm. Suec. 1871, p. 77 ; Wille, Norges Ferskv. 



Alg. 1880, p. 58 ; Heimerl, Desm. alp. 1891, p. 592. 

 ? Closterium obtusum a. minor Racib. Nonn. Desm. Polon. 1885, p. 62. 

 Closterium obtusum forma apicibus subtruncatis West, Alg. Eng. Lake 



Distr. 1892, p. 719, t. 9, f. 13. 

 Roya ol/tusa var. montana West & G. S. West, New and Int. Freshw. 



Alg. 1896, p. 152, t. 3, f. 23, 2-i ; Alg. S. England, 1897, p. 479; 



Alga-fl. Yorks. 1900, p. 48. 



A smaller variety with the apices distinctly sub- 

 truncate. 



Length 48-81 n ; breadth 5-6 p. 



ENGLAND. Helvellvn, Westmoreland ! Cocket Moss, 



*j 



Baildon Moor, and Cam Fell, W. Yorks ! 



WALES. Llyn Pencraio- near Bettws-v-coed, Car- 



t/ O 7 t/ 



narvonshire ! 



Gear/I'. Distribution. Austria. 



The var. montana is more frequently met with in abundance 

 than the typical form, generally occurring amongst other 

 alga? or amongst mosses on wet rocks. 



2. Roya cambrica West & G. S. West. 

 (PI. X, fig. 31.) 



Roya cambrica West & G. S. West, Notes Alg. Ill, p. 9 (sep.l, t. 446, p. 11. 



Cells of medium size, cylindrical, 25-26 times longer 

 than their diameter, slightly curved, apices subtrun- 

 cate and scarcely narrowed; chloroplast with 12-14 

 pyrenoids. 



Zygospore unknown. 



Length 173-177 ^', breadth 6'2-6'7/x; breadth of 

 apices 4'6 4'8 ^. 



WALES. Llyn Ogwen and Llyn Cwlyd, Carnarvon- 

 shire ! 



