PL cell. aph. 2.THALASSIOPHYT7E. 50. Carrod. 351 
Salt marshes and the sea-shore. 
Thallus slippery, flaccid, 2 inches high. 
XXVI. 51. NOSTOC. Paracelsus. Nosfoch. 
Thallus not uniform or globular, vesicular, greenish, ge- 
latinous; sporidia 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 nosloch . 
Terrestrial ; thallus not uniform, solid, plated, wavey; 
threads loosely interwoven. 
. Ulva terrestris pinguis et fugax, Dillen in Rnii Syn. 64, 11. 
Linckia terrestris gelatinosa membranacea vulgatissima, ex pallida et 
<virescente fulva, Micheli Nov. Gen. PI. 126, 1. 
Tremella Nostoc, Lin. S. P. 1625; Engl. Bot. 461. 
Fucus Tremella Nostoc, Gmel. Hist, Fuc. 222. 
Nostoc commune. Voucher , 222. 
Nostoc vulgare, Wahl. FI. Lapp. 992.- 
JLinckia terrestris, Roth Cat. 3, 345. 
Alcyonidium Nostoc, Lamouroux Thai. Ess. 71. 
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 pal ust ris gelatinosa, saxis adnascens, ex obscuro fulva, et con- 
eava vesicam referens, Micheli Nov. Gen. PI. 126,2. 
Nostoc verrucosum, Voucher, 225. 
Tremella fluviatilis, Dillen Mus. 10. 
Tremella verrucosa, Lin. S. P. 1625 ; Hudson FI. Angl. 565. 
Tremella utricwlata, Huds. FI. Angl. 564? 
Fucus Tremella verrucosa, Gmel. Fuc. 227. 
Linckia verrucosa, Roth Cat. 3, 345. 
Rocks and stones in rivers, often floating. 
Thalli aggregated ; when young solid, smooth, opake, 
when old, hollow, yellowish green. 
3. Nostoc musconm . Moss nostoch . 
Thallus 2-formed, papillose, tuberculate, rather leather- 
like. 
Nostoc muscorurn, Agardh Syn. 132. 
Tremella intestinalis, FI. Dan. 885. 
Damp mossy places. 
Blackish green , harder and smaller than n. commune. 
