^46 DESMIDE^. 



regarded as generally distinct therefrom, as D. cylindricum 

 and D. Swartzii have to be so considered.* 



52. GLJEOPEIUM Berk. MSS. 



Char. Filaments cylindrical, invested in a broad elastic sheath. 

 Cells slightly crenate. Endochrome stellate. 



From the above definition it would appear that this genus 

 does not differ in any marked manner from Desmidium 

 There is certainly more ground for its formation than for the 

 establishment of Kiitzing's Didymoprium ; but perhaps the 

 ends of science and of nomenclature would have been an- 

 swered to have placed the two species which it is made to 

 comprise and which differ as widely from each other as they 

 do almost from the genus Desmidium in a distinct section of 

 that genus. 



1. Gl^OPRIUM DISSILIENS Berk. 



Plate LXXXIIL Figs. 3, 4. 



"Char. Filaments fragile. Cells slightly crenate, grooved he- 

 ticeen the crenatures, nearly as long as broad. Sheath 

 broad. Endochrome six or seven rayed. 



Desmidium mucosum Breb. Conf. dissiliens, Eng. Bot. 

 t. 2464. D, mucosum Ralfs, in Annals, vol. xi. p. 374. 

 plate viii. fig. 2. GlcEopriurn dissiliens Jenner, in Fl. 

 Tunbridge Wells, p. 192. 



Hab. Crom Byclan : W. Borrer, Esq. Tunbridge Wells 

 and other places in Sussex, frequent : 3Ir. Jenner. Near 

 Bedgelert and about Dolgelly, North Wales ; Swansea, 

 South Wales ; plentiful near Penzance, Cornwall : Mr. 

 Ralfs. High Beech, Essex; Hertford Heath and 



* Mr. Jenner has pointed out a character which seems to set the ques- 

 J;ion of the distinctness of this species at rest. He states that in Desmidium 

 quadrangulatum the angles of the cells are rounded, while in D. Sivartzii 

 fliey are acute. 



