Pl.cell.aph. 1. HYDROPHYTiE. 6. Scytonema. 287 
Conferva radicans, Dillvo. Syn. 57 ; Engl. Bot. 2138. 
Rocks covered by the sea ; August. 
Tufts an inch thick ; sporidia globular. 
B. Bangideje. 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. GIRARDIA. Girard. 
Sporidia spherical. 
1. Girardia atrovirens. Blackish- green girard. 
Threads branched, stiff; branches coriaceous, scattered, 
diyaricated ; sporidia 3 or 4, in each transverse series. 
Lichen pubescens? Linn. FI. Suec. 1126. 
Conferva atrovirens, Dillvo. 25. 
Scytonema atrovirens, Agardh Disp. ed. 1, 39. 
Cornicularia pubescens, Acharius Syn. Licit. 302. 
Barigia atrovirens, Lyngbye Hydr. Dan. 85. 
Rocks. 
Tufts 3 inches long, black; threads aggregated, uprio-ht 
at bottom, then decumbent, very much branched ; branches 
thinner at both ends, spreading. 
0. prolifera. Threads hispid, spinulose. 
Scytonema atrovirens prolifera, Agardh Disp. ed. 1,39. 
Cornicularia pubescens hispid ula, Acharius Syn . Licit. 302. 
2. Girardia fuscopurpurea. Brownish-purple girard. 
Threads simple, straight, unequally torulose; sporidia 
many in each transverse series. 
Conferva fusco-purpurea, Dillvo. 92. 
Oscillatoria fusco-purpurea, Agardh 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 1 0 in each series. 
j3. atropurpurea. Threads blackish purple. 
Conferva atropurpurea, Dillvo. 103. 
Conferva triehodes, Ducluz. Essai, 30. 
Oscillatoria atropurpurea, Agardh Syn. 109. 
Bangia fuscopurpurea /3, Lyngbye Hydr. Dan. 83. 
On piles, just below the surface of the sea. 
Holdfasts fibrous. 
