Pl, cell. aph. 2. THALASSIOPHYT AK. 50. Carrod.. 351 
Salt marshes and the sea-shore. 
Thallus slippery, flaccid, 2 inches high. 
XXVI. 51. NOSTOC. Paracelsus. Nostoch. 
Thallus not uniform or globular, vesicular, greenish, ge- 
latinous; sportdiu globose, in curved, beadlike threads.— 
This genus has much affinity with oscillatoria, but the 
threads of that genus radiate, and have no integument 
over them. 
1. Nostoc commune. Common nostoch. 
Terrestrial ; thallus not uniform, solid, plated, wavey; 
threads loosely interwoven. 
Ulva terrestris pinguis et fugax, Dillen in Raii Syn. 64,11. 
Linckia terrestris gelatinosa membranacea vulgatissima, ex pallida et 
yirescente fulva, Micheli Nov. Gen. Pl, 126, 1. 
Tremella Nostoc, Lin. S. P. 1625; Engl. Bot. 461. 
Fucus Tremella Nostoc, Gmel. Hist. Fuc. 222. 
Nostoc commune, Vaucher, 222. 
Nostoc vulgare, Wahl. Fl. Lapp. 992. 
Linckia terrestris, Roth Cat. 3, 345. 
Alcyonidium Nostoc, Lamourouxr Thal. Ess. 11. 
Star-shoot. Star-slough. 
Damp, shady, gravelly places; summer and autumn. 
Thallus lobed, 2 or 3 inches in diameter; pale green, 
mostly seen after rain. 
2. Nostoc verrucosum. Warty nostoch. 
Thallus rather globose, rather leatherlike, hollow, 
plaited; threads very closely interwoven. 
Linckia palustris gelatinosa, saxis adnascens, ex obscuro fulva, et con- 
cava vesicam referens, Micheli Nov. Gen. Pl. 126, 2. 
Nostoc verrucosum, Vaucher, 225. 
Tremella fluviatilis, Dillen Mus. 10. 
Tremella verrucosa, Lin. §. P. 1625; Hudson Fl, Angl. 565, 
Tremella utriculata, Huds. Fl. Angl. 564? 
Fucus Tremella verrucosa, Gmel. Fuc, 227. 
Linckia verrucosa, Roth Cat. 3, 345. 
Rocks and stones in rivers, often floating. 
Thaili aggregated; when young solid, smooth, opake, 
when old, hollow, yellowish green. 
3. Nostoe muscorum. Moss nostoch. 
Thallus 2-formed, papillose, tuberculate, rather leather- 
like. 
Nostoc muscorum, Agardh Syn. 132. 
Tremella intestinalis, Fl. Dan. 885. 
Damp mossy places. 
Blackish green, harder and smaller than n. commune. 
