PLcelLaph. 1. HYDROPHYTE. 25. Conferva. 3Q9 
23. Conferva Brownii. Brown's crow silk. 
Tufts close; threads much branched, rather stiff, short, 
green; branches slightly 1 -rowed, blunt; joints 4 times as 
long as broad, rather thicker above. 
Conferva Brownii, Dillwyn , 5S. 
On wet rocks in caves. 
Tuft flat or convex ; threads upright, about the eighth 
of an inch long, rather thick, resembling those of c. sega- 
gropilaris. 
24. Conferva velutina. Velvetty crow silk. 
Tuft close, green, velvetty; threads branched, bent, en- 
tangled at bottom, rooting, hyaline, at top blunt ; joints 
longer than broad. 
Byssus tenerrima viridis, veiutum referens, Dillen in Rail Syn. 56, ,1* 
Byssus velutina, Lin. Sp. PI. 1638. 
Conferva varia, Roth Cat. 3,301. 
Conferva velutina, Dillwyn , 17 ; Engl. Bot. 1556. 
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 crow silk. 
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, Agardh Syn. 73. 
Caves and caverns. 
Branches recurved, entangled; when dry rather stiff, 
elastic, pellucid. 
26. Conferva umbrosa . Shade crow silk. 
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. 
