V. CRYPTONEMIACE^E. IC7 



the axils patent, rounded ; apices obtuse ; conceptacles imbedded in the upper 

 segments, numerous, slightly prominent toward both surfaces ; nemathecia sessile, 

 hemispherical, densely scattei'ed over both surfaces of the frond. J. Ag. Sp. Alg. 2, 

 p. 320. Chondms Norvegkiis, Lamour. — Harv. Phyc. Brit. t. 187. Oncotylus Nor- 

 vegicus, Kiitz. Sp. Alg. p. 789. Fucus Norvegicus, Turn. Hist. t. 41. E. Bot. t. 1080. 

 Chondrus dubius, Mont. Fl. Alg. p. 117. 



Hab. Penobscot Bay, Maine, Mr. J. Hooper, (v. v.) 



The only American specimen of this species which I have yet seen is two inches 

 long, about a line in diameter, and irregularly dichotomous ; about four or five 

 times forked, the segments linear, divaricating, and the axils remarkably rounded. 

 It bears two or three young nemathecia ; and the cellular structure is exactly as in 

 the European plant. Notwithstanding the northern locality from which it comes, 

 ]\Ir. Hooper's specimen much more nearly resembles the narrow Algerian variety 

 called Chondrus dubius by Montague, than any specimen I possess from the English 

 or Irish coasts. 



4. Gymnogongrus linearis., J. Ag. ; frond stipitate, slightly channelled or flattish, 

 dichotomous, fastigiate ; segments linear, somewhat thickened at the margin, very 

 entire, the terminal ones obtuse, rounded, and dilated ; nemathecia sub-globose, 

 plentiful on the upper lacinia?, and almost always protruded on the concave surface 

 of the lobe. J. Ag. Sp. Alg. 2, p. 325. Chondrus linearis, Grev. — Kiitz. Sp. Alg. p. 

 738. Fucus linearis, Turn. Hist. t. 220. 



Hab. At Port Trinidad, Pacific Coast, Lat. 41° 12' N., A. Menzies, Esq. (v. s. in 

 Herb. Menzies). 



Frond four to six inches high, stipitate. Stipes sub-cylindrical, and as thick as a 

 crow's quill at the base, very soon compressed, then flattened, somewhat channelled, 

 one to two lines in diameter, two to three inches long, forked at the summit, after 

 which the flabelliform frond is repeatedly dichotomous. Lacinicc linear, slightly 

 channelled, the terminal ones broader and cuneate, very obtuse or subemarginate ; 

 or else bifid, each apex truncate. Nemathecia very convex, as large as rapeseed. 

 Colour a dark red-l)rown, more rufous in the tips. Substance cartilaginous. It 

 does not adhere to paper in drying. 



In aspect this species is not unlike Chondrus crispus, but is widely different in 

 structure. 



IV. AHNFELTIA. /. Ag. 



Frond cartilagineo-corneous, subterete, dichotomous or secundly proliferous, com- 

 posed of two strata or cells ; the medullary stratum of very slender, densely packed 



