V. CRYPTONEMIACE.E. 165 



fi-ondlets ; in others, the lamina? are repeatedly forked, and these strongly resemble 

 Rhodymenia Pahnetta. In others, a narrow, cuneate, twice or thrice-forked lamina 

 has its ultimate lacinia? suddenly widened into cuneato-renifoi'ra lobes from one to 

 two inches wide, and either simple, bifid, trifid, or more commonly truncate and 

 eroded at the summit ; these lobes are so much wider than the lacinite which bear 

 them, that the latter appear like mere stipites in comparison. Colour a deep, clear, 

 and full lake red, becoming darker in drying. Substance rigid. 



I dredged numerous varieties of this plant at Halifax, some of them perfectly 

 resembling the common European form ; others altogether peculiar ; and others 

 approaching so nearly to the Antarctic Ph. mneifolia, Hook, and Harv. (from the 

 Falkland Islands) as to render the specific validity of that plant doubtful. 



2. Phtllophora membranifoUa, J. Ag. ; stem cylindrical, filiform, branched ; 

 the branches expanding into broadly wedge-shaped, bifid or dichotomous laminag ; 

 conceptacles ovoid, stipitate, rising from the branches or lamina? ; nemathecia form- 

 ing broad, dark-coloured, convex patches in the centre of the laminae. /. Ag. Sp. 

 Alg. 2, p. 334. Harv. Phyc. Brit t. 163. Phyllotylus memhranifoUus, Kiitz. Sp. Alg. 

 p. 790. Fucus memhranifoUus., Turn. Hist. t. 74. E. Bot. t. 1965. 



Hab. Boston Bay (in fruit), Mrs. Asa Gray, W. H. H. Newport, Pthode Island, 

 Prof. Bailey and Mr. S. T. Olncy. New York, Messrs. Hooper and Calverley. Long- 

 branch, New Jersey, Miss Morris, (v. v.) 



Stem fihform, three to four inches long, as thick as sparrow's quill, irregularly 

 divided ; branches ending in fan-shaped, repeatedly forked, flat lamina?, one to two 

 inches long. Lacinice cuneiform, widely spreading, A\nth very wide, rounded axils, 

 two to four lines broad, obtuse. Conceptacles as large as rape-seed, stipitate, 

 scattered on the branches or lamina?. Colour a dull brownish-purple or livid. Sub- 

 stance rigidly membranaceous. 



III. GYMNOGONGRUS. Mart. 



Frond carnoso-coriaceous, terete, compressed, or flat, linear, dichotomous, com- 

 posed of two strata of cells ; the medullary stratum of roundish-angular, empty 

 cells ; the cortical of moniliform, vertical, closely packed, short filaments, formed 

 of minute, coloured cellules. Conceptacular-nucleus immersed in the frond, more or 

 less prominent, consisting of several associated Jiiicleoli or masses of minute spores. 

 Nemathecia external, hemispherical, wart-like, formed of radiating, moniliform fila- 

 ments, whose articulations are at maturity changed into strings of cruciate tetra- 

 spores. 



