TEXIUM. 85 



Sussex (Rait*). Hants! (Bennett). Devon! Corn- 

 wall ! (Marquand). 



WALES. General in the mountainous areas ! 



SCOTLAND. General ! ; zygospores from north of 

 Loch Dawan, Aberdeen (Roy Bisxrff). Common in 

 the Outer Hebrides ! 



IRELAND. Galway ! Kerry ! Donegal ! Dublin 

 and Wicklow (Arrl/rr). Down ! 



Geoff-r. Distribution. France. Germany. Austria. 

 Italy. Poland (var.). Switzerland. Norway. Sweden. 

 Finland. Lapland in Russia. Faeroes. New Zealand. 

 United States. Brazil. 



12. Penium cuticulare West & G. S. West. 

 (PL VI, figs. 4, 5.) 



Penium cuticiilare West & G. S. West, New and Int. Freshw. Alg. 1896, 

 p. 153, t. 4, f . 43, 44 ; Norclst, Index Desm. 1896, p. 276 ; West & G. S. 

 West, Alg. S. England, 1897, p. 478; Notes Alg. I, 1898, p. 3 (sep.). 



Cells minute, 2 J-3J times longer than their diameter, 

 cylindrical and unconstricted, apices broadly truncate 

 with rounded angles ; cell- wall reddish-brown, very 

 minutely and irregularly papillose-punctate. 



Zygospore angular-globose, smooth. 



Length 19-34;*; breadth 8-1 0/<; diam. zygosp. 

 19-22,1. 



ENGLAND.- -Thursley Common, Surrey (with zygo- 

 spores) ! 



This species is very closely allied to P. cylindrux (Ehvenb.) 

 Breb., differing only in its smaller size,, the much liner and 

 irregular markings on the cell-wall, and in the angularity of 

 the zygospore. The young portions of the eel I- wall are 

 perfectly smooth and without colour. 



It is a very similar plant to the one described by Schmidle 

 as P. Cylindrus var. subtruncatum (ride Beitr. alp. Alg. 1895, 

 p. 310, t. 14, f. 27, 28), but the latter is rather larger and has 

 a coloivrless cell-wall. Schmidle (Lappmark Susswasseralgen, 

 1898, p. 16) has since elevated his variety to specific rank 

 under the name of P. subtruncatum, and he places P. cuticu- 

 lare as a synonym of it. The two plants are, however, not 



