82 BRITISH DESM1DIACE.E. 



ENGLAND. Old Cote Moor, W. Yorks ! Mickle Fell, 

 N. Yorks ! 



SCOTLAND. Poolewe, Ross; Brin, Inverness: Heugh- 

 liead, Aboyiie, " Colonel's Bed " in Braemar, Aberdeen; 

 zygospores from Aboyne, Aberdeen (Roy Biwtf). 

 Lewis, Outer Hebrides ! 



WALES. Capel Curig, Carnarvonshire ! Ffestiniog, 

 Merioneth ! 



IRELAND. Monrne Mts., Down ! 



(jeogr. Distribution.- -France. Austria. Xorway. 

 Bur mail. Siam. Madagascar. Brazil. Argentina. 



o o 



9. Peniuin truncatum Breb. 

 (PI. VIII, figs. 24-2(3.) 



Penium truncatum Breb. in Rails' Brit. Desm. 1848, p. 152, t. 25, f. 2 ; 



Arch, in Pi-itch. Iiifus. 1861, p. 751 ; Eabenh. Flor. Em-op.' Algar. Ill, 



1868, p. 121 ; Kirchn. Alg. Schles. 1878, p. 136 ; Wolle, Desm. U.S. 



1884, p. 35, t. 5, f. 9, 10 ; Cooke, Brit. Desm. 1886, p. 44, t. 17, f. 4 ; 



West, Alg. W. Ireland, 1892, p. 128 ; Alg. Eng. Lake Distr. 1892, p. 721 ; 



Eoy & Biss. Scott. Desm. 1894, p. 253; West & G. S. West, Alg. S. 



England, 1897, p. 479 ; Alga-fl. Yorks. 1901, p. 46. ; Alg. N. Ireland, 



1902, p. 21 ; Nordst. Index Desmid. 1896, p. 261. 

 P. truncatum forma punctata West, Add. Alg. W. Yorks. II, 1891, p. 245; 



West & G. S. West, Alga-fl. Yorks. 1901, p. 46. 



Cells small, 2-o times longer than their diameter, 

 cylindrical, slightly constricted or unconstricted, apices 

 truncate with slightly rounded angles ; cell-wall colour- 

 less and very minutely (often indistinctly) punctate. 



Zygospore globose and smooth. 



Length 23'5-47 t* ; breadth 10-13'5 /LI ; diam. zvo-osp. 

 26-5 p. 



ENGLAND. W. and E. Yorks ! Lancashire ! Devon ! 

 Cornwall ! (Marquand). 



'WALES. Capel Curig! (Coob> ,\- II7//x), Llyn-y-cwm- 

 ifynon, Llyn Idwal, Twll Du, Glyder Facli (at 2,200 ft.), 

 Bethesda, Bettws-y-coed (Eoy), Moelfre, Carnarvon- 

 shire ! Dolgelly (Half*) and Ffestiniog, Merioneth! 

 Glamorganshire ! Monmouth ! 



SCOTLAND. Sutherland, Ross, Inverness ! Aberdeen, 

 Kincardine, Perth!, Argyll, Arran ; zygospores from 

 Muiryhaugh, Kincardine (//<>// ^' Bissett). 



