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284 4. Elisa. 1 . HYDROPHYTE. PL cell. aph.
7. Elisa scopulorum. Rocky-shore elisa.
Marine; threads green, rather stiff, twining, pointed,
very short, forming an upright, close, blackish green mat.
Conferva scopulorum, Weber et Mohr Suec. 195; Engl. Bot.2ni.
Oscillatoria scopulorum, Agardh Disp. ed. 1,37.
Rocks, planks, and large marine plants.
Tiifts very close, very thin ; threads not branched, agglutinated
at bottom ; rings very close.
8. Elisa confervicola. Conferva elisa.
Marine; threads simple, verdigris green, rather stiff,
upright, attenuated, short, slightly bundled together.
Conferva marina, parasitica tenuissima et brevissima glauca, Dillen
Muse. 552.
Conferva confervicola, Ruth Cat. 3, 193; Dillie. 8.
Oscillatoria confervicola, Agardh Disp. ed. 1,37.
On cylindrical marine plants ; summer.
Threads a line long, in scattered minute tufts, upright,
often hyaline, free at bottom.
9. Elisa zostericola. Glasswrack elisa.
Marine; threads simple, brown, rather stiff, upright,
attenuated, very short, in tufts.
Conferva zostericola, Fl. Dan. 1599, 1.
Oscillatoria Mucor, Jgardh Disp. 3, 27.
Oscillatoria zostericola, Lyngbye IJydr. Dan. 91.
On zostera marina.
T'lifts brownish, about a quarter of an inch long ; threads
very slender.
V. 5. RIVULARIA. Agardh. Rivulet-moss,
Filaments gelatinous, membranaceous, not branched,
straight, attenuated, not oscillating, arising from a common
centre, forming a gelatinous, globular or elongated
blackish green mass.
1. Rivularia atra. Deep-Hack rivulet-jnoss.
Marine; titfts hemispherical, solid, very hard, shining;
threads straight, pointed, agglutinated at bottom, free at
top, hyaline, greenish.
Tremella hemispherica, Linn. Syit. Nat. 2, 714.
Fucus Tremella hemispherica, Gmel. Hist. Fuc. 225.
Batrachospermum hemisphericum, De Cand. Ft. Fr. 2,591.
ChsEtopliora atra, Agardh Disp. ed. 1,43.
Rivularia atra. Roth Cat. 3, 340; Engl. Bot. 1798. ;
Linckia hemispherica, Schumach. Enum. 2, 1 14.
Linckia atra, Lyngbye Hydr. Dan. 195.