SPONDYLOSIUM. 227 



8. Spondylosium pulchellum Arch. 

 (PL CLXI, figs. 1-3.) 



a pulchellum Arch. Suppl. Cat. Desm. 1858, p. 253, t. 21, f. 7 ; 

 Rabenh. Flor. Europ. Alg. 1868, p. 150; Cooke, Brit. Desm. 1887, p. 6, 

 t. 2, f. 4; Maskell, Further Notes X. Zeal. Desm. 1888, p. 9, t. 1, f. 2 ; 

 De Toni, Syll. Alg. 1889, p. 792 ; West. Alg. X. Wales, 1890, p. 7 ; Comere, 

 Desm. de France, 1901, p. 199, t. 16, f. 8. 



Snondylosium pulchellum Arch, in Pritch. Inf. 1861, p. 724, t. 3, f. 10 ; 

 in Quart. Journ. Micr. Sci. 1866, p. 120 ; Xordst. Xorges Desm. 1873, p. 47; 

 Arch, in Quart. Journ. Micr. Sci. 1877, p. 191 ; Kirchn. Alg. Schles. 1878, 

 p. 134 ; Anderss. Sverig. Chlor. 1890, p. 9 ; West, Alg. W. Ireland, 1892, 

 p. 115 ; Roy & Biss. Scott. Desm. 1893, p. 10 ; West & G. S. West, Alg. 

 S. England, 1897, p. 492 : Alga-fl. Yorks. 1902, p. 95 ; Alg. X. Ireland, 

 1902 3 p. 42 ; G. S. West, Brit. Freshw. Alg. 1904, p. 176, f. 67 A : West 

 & G. S. West, Alg. Orkneys & Shetlands, 1905, p. 28. 



Xphcerozosmasecedens vai. pulchdlum Hansg. Prodr. Alg. Bohm. 1888, p. 170. 



Cells very small, about as long as broad, sometimes 

 longer than broad, constriction fairly deep, sinus linear ; 

 semicells truncate-pyramidate, inflated at the base, 

 apex broad and flat, upper angles sharp, almost rect- 

 angular ; lower angles broadly rounded ; sides gently 

 concave ; semicells in side view subcircular ; in end 

 view elliptical ; filaments often long, not twisted, 

 frequently found attached by a short thick gelatinous 

 stalk to other aquatic plants. 



Zygospore unknown. 



Length 12-lou.; breadth 10-11 fj. ; breadth of apex 

 5[JL ; breadth of isthmus 4*5-6 [/.. 



ENGLAND.- -Harrop Tarn, Cumberland ! Grisedale 

 Tarn, Westmoreland ! Adel, W. Yorks, and Strensall, N. 

 Yorks (W. B. Turn.}. Skipwith and Riccall Commons, 

 E. Yorks ! Grimspound ! and Dartmoor (Harris], 

 Devonshire. 



WALES. Snowdon !, Moel Siabod !, and Capel Curig 

 (Cooke & Wills), Carnarvonshire. 



SCOTLAND.- -Ross, Inverness, Aberdeen, Kincardine, 

 Forfar, Perth ! and Argyle (Roy & Biss.}. Sutherland ! 

 Hoy, Orkneys ! 



IRELAND.- -Donegal ! Mayo! Galway ! Kerry! Lough 

 Neagh! Ulster, Minister, Leinster and Connaught 

 .{Adams). 



Geocjr. Distribution- -France. Germany. Galicia and 



