194 CRYPTONEMIACE^. v. 



are all obovate, and unbranched ; the Atlantic cylindrical, proliferously-ramulose. 

 The substance is rather rigid, and the colour purplish or brownish red. 



Sect. 1. Halosaccion ; frond simple^ obovate. 



1. Halosaccion Hydrophora, J. Ag. ; frond rigidly membranaceous, obovate- 

 oval, turgid, attenuate at the base into a short stipes. J. Ag. Sp. Alg. 2, p. 358. 

 Dumontia Hydrophora, Kiitz. Sp. Alg. p. 749. Fucus saccatus, Turn. Hist. <. 241 ? 



Hab. Nootka Sound, 3fr. Menzies. Puget's Sound, Captain Wilkes, (v. s.) 



Fronds tufted, three inches long or more, three quarters of an inch wide, very 

 obtuse, oblong or sub-obovate, quite simple, contracted rather suddenly at the base 

 into a very short stipes. Substance thickish, like that of parchment, rigid. Colour 

 a dull livid purple, passing into green. In drying it does not adhere to paper. 



2. Halosaccion fucicola, Post, and Rupr. ; frond simple, membranaceous, obo- 

 vate-oblong, gradually attenuated at the base into a stipes. /. Ag. Sp. Alg. 2, p. 

 3.58. Dumontia fucicola, Post, and Rupr. Kiitz. Sp. Alg. p. 720. 



Hab. On Fucus vesiculosus at Sitcha, Liitke. On Laurencioe at Monterey, Dr. 

 Coulter, (v. s. in Herb. T. C. D.) 



Fronds resembling the last species, but thinner and softer in texture, and brighter 

 in colour, purple. 



Sect. 2. Halocoelia, J. Ag. ; frond cylindrical^ elongate, beset with similar proliferous 

 ramuli. 



3. Halosaccion ra7nentaceum, J. Ag. ; frond cylindrical, much attenuated at the 

 base, simple or irregularly branched, more or less densely beset with lateral, scat- 

 tered or crowded, simple or forked, tubular ramenta. J. Ag. Sp. Alg. 2, p. 358. 

 Dimiontia soboUfera., Kiitz. Sp. Alg. p. 749- Fucus ramentaceics, Linn. — Turn. Hist, 

 t. 149. (Tab. XXIX. A.) 



Hab. Greenland, Agardh. Newfoundland, Despreaux. Arctic Coast, Seeman. 

 Halifax, W. H. H. Rye Beach, New Hampshire, Miss Frothingham. (v. v.) 



Fronds very densely tufted, ten to fourteen inches long, cylindrical, one to two 

 lines wide at the widest part, much attenuated to the base, and more or less tapering 

 to the apex, sometimes quite simple, sometimes dividing an inch or two above the 

 base into several long simple branches. The frond is rarely naked, usually it is 



