284 4. Elisa’ 1. HYDROPHYTZ. 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. 2171. 
Oscillatoria scopulorum, 4gardh Disp. ed. 1,37. in 
Rocks, planks, and large marine plants. 
Tufts very close, very thin; threads not branched, agelu- | 
tinated 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 
Musc. 552. 
Conferva confervicola, Roth Cat.3,193; Dill. 8. 
Oscillatoria confervicola, Agardk 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 xostericola. | Glasswrack elisa. 
Marine ; threads simple, brown, rather stiff, upright, — 
attenuated, very short, in tufts. 
Conferva zostericola, Fl. Dan. 1599, 1. 
Oscillatoria Mucor, 4gardh Disp. 3, 27. 
Oscillatoria zostericola, Lyngbye Hydr. Dan. 94. 
On Zostera marina. doatis 
Tufts 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 com- 
mon centre, forming a gelatinous, globular or elongated 
blackish green mass. 
1. Rwularia atra. Deep-black rivulet-moss. 
Marine ; tufts hemispherical, solid, very hard, shining ; 
threads straight, pointed, agglutinated at bottom, free at 
top, hyaline, greenish. 
Tremella hemispherica, Linn. Syst. Nat. 2, 714. 
Fucus Tremella hemispherica, Gmel. Hist. Fuc. 225. 
Batrachospermum hemisphericum, De Cand. Fl. Fr. 2,591. 
Chetophora atra, Agardh Disp. ed. 1,43. 
Rivularia atra, Roth Cat. 3,340; Engi. Bot. 1798. 
Linckia hemispherica, Schumach. Enum. 2, 114. . 
Linckia atra, Lyngbye Hydr. Dan. 195. 
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