ROCCELLA TINCTORIA. ORD. LIV. Algz. — 111 
Medical Properties and Uses. As a remedial agent, the Roccella tinctoria 
has very little, if any efficacy, although it was formerly celebrated as a spe- 
cific in disorders of the lungs.* In the present day, it is chiefly used for 
preparing the Archil, used as a chemical test or dye-stuff, as above stated. 
* Many species of Lichen have at different times been employed; not only in do- 
mestic economy and the arts, but in medicine; viz. Lichen caninus, deriving its spe- 
cific name from its supposed specific effects in preventing or curing hydrophobia; Lichen - 
pullus, esteemed astringent, and administered in asthma and coughs ; Lichen pyxidatus, 
much used in whooping-cough and other complaints of the lungs; Lichen sazratilis, 
considered astringent and employed in hemorrhages ; Lichen pustulatus, which may be 
substituted for all-spice; also dyes a fine red ; and Lichen aphthosus, a drastic vermifuge. 
Some of the above, and many other species, are also used as dye-stuffs. 
FUCUS VESICULOSUS. BLADDER-FU: CUi S. BLADDER- 
“sere meneeromeralerm enm 
SYNONYMA. Fucus sive Alga marina latifolia vulgatissima, Raii Syn 
p-40.”.4. Quercus Marina. Gel. Hist. Fuc. p.60. Alga sive Fucus, 
Quercus marina, dictus. Baster, Op. Subs. 2. p. 4, 116. ¢.11. 7.2. Fucus 
vesiculosus. Linn. Sp. Pl. v. 2. p. 1626; Eng. Bot. v.15. t.1066; Wither. 
Bot. Arr. v. 4. p.84; Esper. Icon. Fuc.1. p. 38. t.12; Hook. Scot. P. II. 
p.94; Turner, Hist. Fue. v.2. p. 44. t.88; Hook. Br. Fl. p. 459. 
Class XXIV. Cryptogamia. Ord. III. Alge. 
Nat. Ord. — Alge. 
Gen. Char. Seeds mixed with jointed fibres, produced: in clustered tuder- 
cles, which burst at their summits. 
Spec. Char. Frond coriaceous, flat, linear, dichotomous, entire; with a 
central rib; vesicles innate, in pairs; receptacles, distinct, terminal, 
turgid, mostly elliptical. 
