Pl.cell:aph:. 1. HYDROPHYT. 24. Draparn. 308: 
2. Draparnaldia plumosa. _ Heathery draparnaud. 
Threads very much branched; branches in bundles, many-- 
cut;, pencilshape, mostly. opposite, lanceolate, acute, up= 
right; joits rather longer than broad, with a. transverse 
band. 
Batrachospermum plumosum, Vaucher, 113, 
Conferva mutabilis, Roth Cat. 1, 197. 
Draparualdia hypnosa, Sé. Vincent. dnn. Mus. 12, 405, 
Draparnaldia plumosa, 4gardh Disp. ed. 1, 42. 
Oh woods and stones in rivers; annual; summer. _ 
Tufts three inches long; !ast division of the branches: 
much the longest. 
XXV. 25. CONFERVA.. Pliny. Crowsilk. 
Threads uniform, simple or branched, greenish, jointed ; 
knots pellucid; spores granular, enclosed in the joints. 
a. Plant greenish, sunk, branched. 
1. Conferva lubrica. Slippery crowsilk. 
Threads very much branched, very slender, minute, ge- 
latinous, slippery, green; Lranches divaricating, scattered, 
close, awlshape; tip long, transparent; jozmts 2 or 3 times 
as long as broad, with a central, transverse band. 
Conferva lubrica, Dillwyn, 57; Engl. Bot. 2087, 
Draparnaldia tenuis, dgardh Decad, 3, 30. 
On wood and stones in rivers or stagnant waters; summer. 
Tufts glaucous green, dense, 1 or 2 inches long; threads 
weak; flaccid, attenuated. 
6. exigua. Threads less than a quarter of an inch long; 
joints about as long as broad. 
Conferva exigua, Dillwyn Syn. 62. 
2. Conferva protensa. Extended crowsilk, 
Threads branched, slippery, green; branches diffused, 
very long, attenuated; tip pellucid; jozmts rather longer 
than broad. 
Conferva protensa, Déllwyn, 67. 
3. Conferva nigricans. Blackish crowsilk: 
Threads forked, rather stiff, straight, thick, equal; branches 
distant, long, spreading at bottom; jozis 4 times as long 
_as broad. 
Conferva nigricans, Roth. Cat.3, 217; Dillwyn, 68. 
Ponds. 
