BATRACHOSPEKMUM. 105 



2. Batrachospermum HELMINTOSUM Bory. 



Char. Filaments branched, pyramidal, naked helow ; branches 

 simple, subpinnate, acute, Verticilli contiguous, com- 

 pressed, 



Boiy, in Annalesdu Museum, vol. xii. p. 316. pi. 29. fig. 2.; 

 Corallina pinguis, ramosa viridis, Vaill. Paris, 4to. tab. vi. 

 fig. 6. 



Hab, New River, Cheshunt : A. H. H. 



^^ There is no doubt but that Vaillant's plant is also 

 our plant : the figure which he has given of it is inferior ; 

 the disposition of the branches is badly given ; but the 

 tubercles in it are confounded. The extremities are subu- 

 late, and the author compares his corallina to a muscus Jili- 

 cinus. I have moreover gathered the species in question in 

 the place in which the Parisian botanist has pointed out for 

 his habitat. I then discovered it for the first time upon the 

 rocks in the gloomy bosoms of very many freshwater foun- 

 tains situated in Brittany, beside the river Goesne, near the 

 city of Fougere. 



*^ The stems of this beautiful species scarcely exceed two 

 inches in length. They are fine, and denuded at their base, 

 which appears yellow. Numerous branches proceed from it : 

 they are somewhat subulate, and diminish in length, in such 

 a way, that they incline from the extremities of the plant, 

 which gives to it a pyramidal appearance. 



" The verticilli are compressed, voluminous, horizontal, and 

 so approximated, that they cannot acquire the globular form : 

 they become confused, and form around the stems a continuous 

 cylinder of mucosity. The diameter of this cylinder equals 

 often that of the plume of a little bird. The branches are 

 not less thick at their insertion. The colour of the plant is 

 obscure, of a bluish and uncertain green." 



3. Batrachospermum confusum Hass, 



Plate Xy. Fig. 1. 



Char, Frond large. Filaments much branched, Verticilli 

 contiguous, subconfused, cotnpressed above and beloiv. 



