COSMAEIUM. 29 



Var. constrictum West. (PL LXVII, fig. 23.) 



C. pseudoconnatum var. constrictum West, Alg. W. Ireland, 1892, p. 101 

 t. 21, f. 17. 



Slightly larger than the average size of this species 

 and much more deeply constricted, causing the semi- 

 cells to be transversely broadly elliptic. 



Length 65 /t ; breadth 43 ^ ; breadth of isthmus 26 /t, 



IRELAND. Ballynahinch, Gralway ! 



64. Cosmarium globosum Bulnh. 

 (PL LXVIII, figs. 1, 2.) 



Cosmarium globosum Bulnh. in Hedwigia, 1861, p. 52, t. 9, f . 8 ; R/abeiih. 



Flor. Europ. Algar. Ill, 1868, p. 178 ; Lund. Desm. Snec. 1871, p. 45 ; 



Cooke, Brit. Desm. 1887, p. 121, t. 43, f. 6 [figures incorrect] ; West, 



Alg. N. Wales, 1890, p. 291 ; West, Alg. W. Ireland, 1892, p. 160 ; Alg. 



Engl. Lake Distr. 1892, p. 729 ; Roy & Biss. Scott. Desm. 1894, p. 102 ; 



Nordst. Index Desmid. 1896, p. 130; West & G. S. West, Alg. S. 



England, 1897, p. 491 ; Alga-fl. Yorks. 1900, p. 87 ; Freshw. Alg. 



Orkneys and Shetlands, 1905, p. 22. 

 Calocylindrus strangulatus Cooke & Wills in Cooke, Brit. Desm. 1887, 



p. 128, t. 44, f . 10 ; West, Alg. N. Yorks. 1889, p. 293. 

 Dysphinctium globosum Hansg. Prodr. Algenfl. Bohm. 1888, p. 243 ; 



De Toni, Syll. Alg. 1889, p. 880 ; Heimerl, Desm. alp. 1891, p. 593. 

 Dysphinctium strangulatum De Toni, Syll. Alg. 1889, p. 887. 

 Gosmarium globosum Bulnh. forma Borge, SiissAV. Chlor. Archang. 1894, 



p. 23, t. 2, f . 20. 



Cells small, about If times as long as broad, slightly 

 constricted, sinus rapidly Avidening from an acute apex; 

 semicells subcircular (outline about two-thirds the cir- 

 cumference of a circle) ; vertical view circular, rarely 

 very slightly compressed. Cell-wall punctate, punctu- 

 lations sometimes very obscure, but frequently very 

 distinct. Chloroplasts axile, one in each semicell, 

 with a central pyrenoid from which radiate a number 

 (7-9) of vertically-disposed lobes (sometimes rather 

 irregular) . 



Zy go spore unknown. 



Length 30-36^; breadth 22-25 /^; breadth of 

 isthmus 17-19 /u. 



ENGLAND. Angle Tarn and near Cockermouth, 

 Cumberland ! IVear Stickle Tarn, Westmoreland ! 



