Pl.cell.aph. 1, HYDROPHYTAE. 25. Conferva. 309 
23. Conferva Brownit. Brown’s crowsilk. 
Tufts close; threads much branched, rather stiff, short, 
green; branches slightly 1-rowed, blunt; joimts 4 times as 
long as broad, rather thicker above. 
Conferva Brewnii, Dillwyn, 58. 
On wet rocks in caves. 
Tuft flat cr convex; threads upright, about the eighth 
of an inch long, rather thick, resembling those of c. ega- 
gropilaris. 
24. Conferva velutina. Velvetly crowsilk. 
Tuft close, green, velvetty; threads branched, bent, en- 
tangled at bottom, rooting, hyaline, at top blunt; joits 
longer than broad. 
Byssus tenerrima viridis, velutum referens, Dillen in Raii Syn, 56, 1. 
Byssus velutina, Lin. Sp. Pl. 1638. 
Conferya varia, Roth Cat. 3, 301. 
Conferva velutina, Dillwyn, 17; Engl. Bot. 1555. 
On the ground in damp places. 
Tufts very close; branches alternate, bent, lower distant, 
twigs nearly one-rowed, short, bent, blunt, diffuses a sweet 
fragrance not only when growing, but also for some time 
after being dried. 
25. Conferva cryptarum. Cave crowsilk. 
Threads green, entangled, much branched; branches 
forked, divaricating, pointed ; joints twice as long as broad, 
rather gibbous. 
Conferva cryptarum, Dillwyn, 59; Engl. Bot. 2588. 
Conferva muscicola cryptarum, dgardh Syn. 73. 
Caves and caverns. 
Branches recurved, entangled; when dry rather stiff, 
elastic, pellucid. 
26. Conferva umbrosa. Shade crowsilk. 
Tuft blackish green, velvetty ; threads entangled, branch- 
ed, brittle, branches upright, blunt; joints longer than 
broad; those of the tips inflated, as long as broad. 
-  Conferva umbrosa, Roth Cat. 1, 191. 
Conferva arenaria, Roth Cat. 2, 217. 
Damp shady places; summer. 
Tufts very close; threads short; branches rather crowded. 
