178 CONJUGATED. 



The colour of the filaments in this, as in other species, 

 would appear to be subject to considerable variety ; in their 

 youngest condition, the filaments are stated to be coerulescent ; 

 in their more advanced state, they are purple, and invariably 

 so when dried, exhibiting on paper, which they often stain, 

 some dei>;ree of crloss. 



The Leda cajnicina of Bory, Mougeotia capucina of Agardh, 

 is probably identical with this species. 



3. Staurocaepus quadratus Hass. 



Plate XLVIIL Fi^. 1. 



Char, Filaments of less diameter than those of the iireceding 

 species, bluish green. Sporangia quadrangular. 



Mougeotia quadrangulata Hassall, in Annals of Kat. Hist. 

 vol. xii. p. 185. pi. vii. fig. 3. 



Hah. Cheshunt, and various places in the neighbourhood : 

 A. H. H. Ashdown Forest, and on Crawley Down, near 

 Turner's Mill : Mr. Jenner. 



There is no difficulty in distinguishing this from all other 

 species hitherto recorded. 



4. Staurocarpus virescens Hass. 



Plate XLYIII. Fig. 2. 



Char. Filaments smaller than those of St. quadratus, 

 usually of a grass green colour. Cells before conjugation 

 about eight or ten times as long as broad, but after that 

 period becoming much longer. Sporangia cruciform. 



Staurocarpus afpnis Hassall, in Annals of Nat. Hist. 

 vol. xii. p. 185. pi. vii. fig. 4. 



Hab, Pool near Hoyden, Essex : A. H. H. 



This species comes very near to ^S"^. quadratus, from which 

 it is distinguished by its somewhat finer filaments, and cru- 

 ciform sporangium, the sporangia in St. quadratus being 

 square. 



