284 4. Elisa. 1. HYDROPHYTE. 
PL cell. aph. 
7. Elisa scopulomm. Pocky-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, Agardh Disp. ed. 1,37. 
Rocks, planks, and large marine plants. 
Tufts very close, very thin ; threads not branched, agglu- 
tinated at bottom ; rings very close. 
8. Elisa confervicola. Conferva elisa 9 
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, Roth Cat AS, 193 ; Dillm. 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, I. 
Oscillatoria Mucor, Agardh Disp. 3, 27. 
Oscillatoria zostericola, Lyngbyc Hydr. Dan. 91. 
On zostera marina. 
Tufts brownish, about a quarter of an inch long; threads 
very slender. 
Y. 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 . Rivularia atra . Deep-llack 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, Grnel. Hist. Fuc. 225. 
Batrachospermum hemisphericum, De Cand. FI. Fr. 2,591. 
Chaetophora atra, Agardh Disp. ed. 1,43. 
Rivularia atra, Roth Cat. 3, 340; Engl. -Bot. 1798. 
Linckia hemispherica, Schumach. Enum. 2, 114. 
Linckia atra, Lyngbye Hydr. Dan. 195. 
