BRITISH DESMIDlAi 'E.E. 



ENGLAND. Borrowdale and Ano-le Tarn, Cumber- 



O 



land ! Bowness, Westmoreland ! 



SCOTLAND. Xew Galloway, Kirkcudbright ! 



IEELAND. Roundstone and Ballynahinch, Galwav ! 

 Dublin and Wicklow (Archer). 



Geoc/r. Distribution. France. Austria. Lapland 

 in Russia. East Africa. United States. 



The finely granular apices of this species are very charac- 

 teristic. It is a rare Desmid chiefly confined to a few perma- 

 nent 



Var. crassum West & G. S. West. (PI. VIII, fig. 38.) 



Penium Clevei var. crassum West & G. S. West, New Brit. Freshw. Alg. 

 1894, p. 4, t. 1, f . 5 ; Nordst. Index Desm. 1890, p. 75. 



Cells only twice longer than their diameter, with the 

 lateral margins more convex and with smaller granules 

 at the poles ; chloroplast with one large pyrenoid. 



Length 80-98 ^ ; breadth 42-44'5 /; breadth of 

 isthmus 39-5-40 /u. 



ENGLAND. Bog at the side of Angle Tarn, Cumber- 

 land (1,500 ft.) ! ^ 



16. Penium spirostriolatum Barker. 

 (PI. IX, figs. 1-8.) 



? Penium margaritaceum var. y punctat um Ealfs, Brit. Desm. 1848, p. 149, 



t. 25, f. 1 d-h ; Schmidle, Beitr. Alg. Schwarzwald. 1893, p. 87, t. 3, 



14. 

 Penium spirostriolatum Barker, in Quart. Journ. Micr. Sci. 1869, ix, p. 



194 ; Arch, in Journ. Bot. 1874, p. 94 ; Cooke, Brit. Desm. 1886, p. 39, 



t. 15, f. 9 ; Wolle, Freshw. Alg. U.S. 1887, p. 22, t. 61, f. 19 ; West, 



.Alg. N. Wales, 1890, p. 285, t. 6, f. 24 ; Alg. W. Ireland, 1892, p. 126 ; 



Alg. Engl. Lake Distr. 1892, p. 720 ; Eoy & Biss. Scott, Desm. 1894, p. 



253 ; West & G. S. West, Alg. S. England, 1897, p. 478 ; Some Desm. 



U.S. 1898, p. 282; G. S. West, Variation Desm. 1899, pp. 377-380; 



West & G. S. West, Alga-fl. Yorks. 1900, p. 46 ; Alg. N. Ireland, 1902, 



p. 21 ; Freshw. Alg. Ceylon, 1902, p. 136. 



Closterium spiraliferum Jacobs. Desm. Danem. 1875, p. 177. t. 7, f. 8. 

 Penium Haynaldii Schaarschm. Magyar. Desm. 1883, p. 277, t. l,f. 20. 

 Penium Royanum Turn. Freshw. Alg. of E. India, 1893, p. 165, t. 23, f. 7. 

 Penium scandinavicum Turn. 1. c. p. 166, t. 23, f . 6. 

 Penium spirostriolatum var. amplificatum Schmidt, Grundl. Algenfl. 



Limeburg. Heide, 1903, p. 16, t. 2,'f . 19. 



Cells large, 5-11 times longer than their diameter, 



