270 ALGiE INARTICULATE. [Lichina. 



Tribe II. Lichinee. 



Marine plants, of a blackish-green colour, changing to deep black 

 on exposure to the air, of a cartilaginous substance and fibrous tex- 

 ture. Frond flat or cylindrical, minute, branched in a dichoto- 

 vious or subpalmated mamier. Fructification terminal or nearly 

 so, composed of capsules furnished with a pore, and filled with 

 a colourless gelatinous mass of very fine filaments, among which 

 pellucid oval or oblong seeds are disposed in many radiating 

 moniliform series. Grev. 



6. Lichi'na. Ag. Lichina. 



Frond cartilaginous, blackish-green, dichotomous. Fructifi- 

 cation; roundish capsules of the same colour, containing radiat- 

 ing moniliform lines of pellucid seeds, imbedded in a gelatinous 

 mass of filaments. Grev. Alg. Brit. p. 21. t. 6. — Named from 

 its similarity to some of the Lichen family, among which, indeed, 

 Acharius had placed it. 



1. \j.pygmcea, Ag. {dwarf Lichina); frond between flat and 

 compressed, capsules globose. Grev. — Ag. Sp. Alg. v. I. p. 105. 

 Hook. Fl. Scot. P. IL. p. 96. Grev. Alg. Brit. p. 22. t. 6, Crypt. 

 Fl. sub t. 219. — Fucus pygmaus, Lightf. Scot.- p. 964. t. 32. 

 Turn. Syn. Fuc. p. 258, Hist. Fnc. t. 294. / a—h. E. Hot. 

 t. 1332 F. pusillus, Huds. — F. lichenoides, Good, et Woodiv. 



On rocks which are exposed and almost dry at low water, frequent. 

 Summer and Autumn. If. — About half an inch high. This and the 

 following have almost the habit, but not the texture, of Stereocaulon 

 among the Lichens. 



2. L. confinis, Ag. (least Lichina); frond cylindrical, capsules 

 terminal oval. Grev. — Ag. Sp. Alg. v. I. p. 105. Grev. Alg. 

 Brit. p. 23. t. 6, Crypt. Scot. t. 22 1 . — L. pygm&a, /3. minor, 

 Hook. Fl. Scot. P. II. p. 96. — Fucus pygmazus, /3. minor, Turn. 

 Hist. Fuc. t. 204. f. i — o. — Lichen confinis, Ach. Prodr. — E. Bot. 

 t. *2blb. — Stereocaulon confine, Ach. Meth. 



On rocks partially covered only at high tides, chiefly in Scotland. 

 Dunbar. Ardthur, Capt. Carmichoel. Caroline Park, Dr. Greville. 

 Colvend, Dr. Richardson, &c. — Summer and Autumn. If.. — My own 

 observations have led me to consider this as a mere variety of the pre- 

 ceding, whose different appearance is due to a more frequent exposure 

 to a dry atmosphere. Its height is scarcely 2 or 3 lines. 



Tribe III. Laminarie. 



Plants all marine, of an olive-brown or olive-green colour, be- 

 coming somewhat darker on exposure to the air, varying from cori- 

 aceous to membranaceous. Frond with a lobed or fibrous root, 

 more or less stipitate and forming a plane, entire or cleft expansion, 

 in a few cases, furnished with one or more ribs. Vesicles none, 

 {except in the genus Macrocystis,) unless the hollow stem of 



