CHTETOPIIORA. 125 



Tlirough Draparnaldia tenuis and D. nana there is an 

 easy and natural transition to this genus. 



Imbedded in the gehitinous matrix, are usually, in the 

 older specimens, a number of stony particles; these have been 

 supposed to be in some way or other connected with repro- 

 duction. Vaucher regards them as the ruptured cells of the 

 plant, and destined to reproduce the species. 



1. CniETornoRA dilatata Hass. 

 Plate XIII. Fig. 2. 



Char, Filaments much branched, fasti[)iatc. Extremities 

 dilated. 



Hah. Ireland : Mr. Moore. 



This species I discovered accidentally, mixed up with a 

 specimen of Nostoc muscorum. It is very remarkable. 



2. ClI^ETOPIIORA ENDIVIiErOLIA Ag. 



Plate IX. Figs. 1, 2. 



Char. Mucous matrix somewhat compressed, sub-dichoto- 

 moushj branched. Primary \ix:sxi(^\Q,^ frequently par cdlel ; 

 apices of ultimate ramuli ciliated. 



Batrachospcrmum fasciculatum Vaucher, Hist, des Conf. 

 d'Eau douce, p. 116. pi. xiii. fig. 1.; Harvey in Hooker's 

 Brit. Flor. ii. p. 389. Ulva incrassata, E. Bot. 967. 

 Clmtophora endivicefolia Harv. in INIanual, p. 122. 



Hob. Common in streams. 



" This Batrachosjjerinum is more rare than the preceding 

 species B. moniliforme, B. plumosum, and B. glomeratum : it 

 is met with in slowly running w^aters, covering stones, to which 

 it is attached, under the form of a little green protuberance 

 irregularly lobed at its extremities. It is but little more 

 than a few lines in length, and about half as broad. It can 

 scarcely be distinguished with the unaided sight, but Avith 

 the microscope it appears curiously composed. If but a very 



