140 BRITISH DESMIDIACE^;. 



Cl. calosporum var. galiciensc Gutw. Noun. Alg. Nov. 1896, p. 9, t. 6, 

 f. 21. 



Cells larger than in the typical form ; cell-wall 

 smooth ; zygospores with slightly longer conical pro- 

 jections, the bases of which are a little more remote. 



Distance between apices 140-] 01 /x; breadth 14-17 /x; 

 diam. zygosp. without projections 29 '5-3 7 jot, with pro- 

 jections 38-51 IJL. 



ENGLAND. Near Goring, Oxfordshire (with zygosp.)! 

 . Distribution. Galicia in Austria. 



The specimens described by (iutwinski from Poland,, under 

 the name of " Cl. calosporum var. galiciense" were somewhat 

 smaller than the British forms. His dimensions were : 

 Distance between apices 112-110 /t ; breadth 13 n diam. 

 /ygosp. without projections 24 JJL ; length of projections 6*4 JUL. 



21. Closterium eboracense Turner. 

 (PI. XVI, figs. 7, 8.) 



Closterium Cucumis Wolle, Dcsm. U. S. 1884, p. 40, t. G,f. 17, 18. [Not Cl. 



cucumis Ehrenb. 1843.] 

 Cl. eboracense Turn, in Cooke's Brit. Desm. 1886, p. 37, t. 65, f. 1 ; Turn. 



in Trans. Leeds Nat. Club, 1886, I, t, 1, f. 16 ; De Tom, Syll. Alg. lss;i, 



p. 844; Roy & Biss. Scott. Desm. 1894, p. 244; West & G. 8. West, 



Alg-a-fl. Yorks. 1902, p. 50. 

 Arthrodia eboracense Kuntze, Revis. gen. plant. 1891, p. 883. 



Cells of medium size, robust, about 5 times longer 

 than their diameter, outer margin about 120 of arc, 

 inner margin concave, not tumid, gradually attenuated 

 to the apices, which are thick and broadly rounded ; 

 cell-wall smooth and colourless ; chloroplasts with 

 eio-ht distinct ridges and a single series of about five 



r^ o CD 



pyrenoids ; terminal vacuoles large, with a number of 

 moving granules. 



Zygospore unknown. 



Distance bet \voon apices (length) 14U-2<Mi/x; breadth 

 :'>*> I-9 jji ; bi-eadth near apices 11-15 /x. 



ENGLAND. Campsall, Doncaster, and Chapel-Aller- 

 ton, W. Yorks (Turner). Mickle Fell, N. Yorks ! 



SCOTLAND. Little Don, Haughton, Aberdeen (Roy t j- 

 Bissett). 



