114 NOSTOCHINE^. 



Sutherland further mentions having tried it as an article of food, and found it prefer- 

 able to the Tripe de Roche of the arctic hunters. Its nutritive qualities are probably 

 equal to those of the jelly derived from other Algas. 



3. NOSTOC verrucosum, Vauch. ; aquatic ; fronds large, gregarious, confluent, sub- 

 globose, plaited, at length hollow, blackish-green. Vauch. t. lQ,fig. 3. Ag. Syst. p. 21. 

 Harv. Man. Ed. 1, p. 185. Hass. Brit. Fr. Wat. Alg. p. 291, tab. 15, fig. 1. Kutz. 

 Sp. Alg. p. 300. 



Hab. On stones in fresh water streams. Pools of fresh water. Isle of Disko, and at 

 Beechey Island, Arctic llegions, Dr. Lyall. Santa Fe, New Mexico, Fendler. 



Fronds gregarious, at length confluent, adhering firmly to the rock on which they 

 grow, becoming hollow and torn in age, and finally floating to the sui-face. Colour a 

 bottle-green. Glossy when dry. 



4. NoSTOC cristattim, Bailey ; aquatic , fronds orbicular, piano-compressed, firm, 

 smooth or tuberculated, attached by a point of the circumference, erect. iV. nummu- 

 lare, Harv. MS. in Herb. 



Hab. In rivulets, attached to stones under water. Near West Point, Professor 

 Bailey. Crumelbow Creek, Hyde Park, N.Y., W.H.H. (v. v.) 



This pretty little species grows on stones in running water and may possibly be of 

 common occurrence. The fronds are circular, about half an inch in diameter, or rather 

 more, the tenth of an inch in thickness, piano compressed and solid ; but perhaps in age 

 they would become hollow, and then would probably be spherical. Such inflated fronds, 

 however, have not yet been seen. They are fixed to the stones on which they grow by 

 a single point of the circumference, and stand erect, like miniature cock's-combs, whence 

 the specific name cristatum bestowed by Professor Bailey. The substance is very firm 

 and cartilaginous. The filaments are mucli curled and very densely packed together, 

 moniliform, and of a dark bluish-green under the microscope. The colour of the frond 

 to the naked eye is a dark olive-green, blackish rather than blueish. 



5. NosTOC AS'M<A<?rfa?i(i«, Dickie ; "discoid, coriaceous; filaments crowded ; cells mostly 

 spherical." Dickie in App. Suth. Voy. 1,^?. 193. 



Hab. South side of harbour, in winter quarters, Baffin's Bay, July, 1851. Dr. 

 Sutherland. 



" The plant is one to two inches in diameter, attached by one point of the margin. 

 Plicato-venose beneath, the plicce radiating chiefly from the point of attachment ; faintly 

 venose above, especially near the point of adhesion ; toward the margin reticulately 

 venose." Dickie, I. c. 



