Pl.cell.aph. 1. HYDROPHYT2. 6. Scytonema. 287 
Conferva radicans, Diliw. Syn. 57; Engl. Bot. 2138. 
Rocks coveted by the sea; August. 
Tufts an inch thick; sporidia globular. 
B. Banerwex. Thallus tubular, cylindrical, not jointed, 
membranaceous, leatherlike, simple or branched; sporidia 
elliptical, globular, in several parallel transverse series, 
afterwards free, in the tubes. 
VII. 7.GIRA RDIA. Girard. 
Sporidia spherical. 
1. Girardia atrovirens. Blackish-green girard. 
Threads branched, stiff; branches coriaceous, scattered, 
divaricated ; sporidia 3 or 4, in each transverse series. 
Lichen pubescens? Linn. Fl. Suec, 1126, 
Conferva atrovirens, Dillw, 25. 
Scytonema atrovirens, 4gardh Disp. ed. 1, 39. 
Cornicularia pubescens, Acharius Syn. Lich. 302. 
Bangia atrovirens, Lyngbye Hydr. Dan..85, 
Rocks. 
Tufts 3 inches long, black; threads aggregated, upright 
at bottom, then decumbent, very much branched; branches 
thinner at both ends, spreading. 
8. prolifera. Threads hispid, spinulose. 
Scytonema atrovirens prolifera, 4gardh Disp. ed. 1, 89. 
Cornicularia pubescens hispidula, 4charius Syn. Lich. 302. 
2. Girardia fuscopurpured. Brownish-purple girard. 
Threads simple, straight, unequally torulose; sporidia 
many in each transverse series. 
Conferva fusco-purpurea, Dill. 92. ; 
Oscillatoria fusco-purpurea, 4gardh Disp. ed. 1, 34. 
Bangia fusco-purpurea, Lyngbye Hydr. Dan. 83. 
Piles and stones in the sea. 
Tufts pendulous; threads aggregate,'a quarter of an inch 
long, elastic, blunt; sporidia 4 to 10 in each series. 
8. airopurpurea. Threads blackish purple. 
Conferva atropurpurea, Dillw. 103. 
Conferva trichodes, Ducluz. Essai, 30. 
Oscillatoria atropurpurea, dAgardh Syn, 109. 
Bangia fuscopurpurea 8, Lyngbye Hydr. Dan. 83. 
On piles, just below the surface of the sea. 
Holdfasts fibrous. 
