GL^OPRIUM. 347 



Wormley West End, Herts : A. 11. H. Bandon : Prof. 

 G. J. Allman. Co. Kerry : Mr. Andreics. 



The filaments wlien viewed separately, or as regards the 

 line of cells are rather slender, but when taken in connec- 

 tion with the broad sheaths, their diameter is considerable; 

 this sheath, though expanded and firm, often, unless a good 

 microscope be used, escapes detection. It is from the pre- 

 sence of this sheath that the plant owes its excessive muco- 

 sity, and it is by it that we account for the parallel arrange- 

 ment which the filaments frequently assume on the field of 

 the microscope, without at the same time appearing to touch 

 each other, although they really do so by means of the almost 

 invisible mucous sheath. The contrast between the coloured 

 cells and the transparent sheath renders this an exceedingly 

 beautiful microscopic object. 



2. Gl^oprium mucosum Berk. 



Plate LXXXIII. Figs. 5, 6. 



Char. Filaments not fragile. Cells usually nearly as long 

 as broad, not grooved round the centre. Angles of cells 

 mostly minutely bicrenate. Sheath very broad, faint. 



Conf. mucosa Mertens, Dillw. Syn. t. /9; Harvey, in 



Hook. Br. FI. p. 351. ; also in Manual, p. 127. Glao- 



prium mucosum Jenner, in Flora of Tunbridge "Wells. 



Desmidium bimucronatum Hassall, j\ISS. 



Hob. In stagnant water, Bautry : Miss Ilutchins. Appin : 



Captain Carmichael. Cheshunt Common, High Beech 



and elsewhere : A. H. H. Penzance : Mr. Ralfs. Bogs 



at Fisher's Castle, very abundant, Sept. 1844; Chilting- 



ton Common : Mr. Jenner. 



Tliis species differs very considerably from the previous one, 



in having somewhat longer cells, a more higlily developed 



mucous sheath, in the absence of the central constriclion of 



the cells, and in the presence of the excessively minute bicrenate 



processes placed at the angles of the cells, and which were 



