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Plcdl.aph. 3. HOMOTHALAME^. 87. Usnea. 403
B. UsNEADE^. Tlialhis slightly crustlike, penetrated
by an elastic, central bundle of ducts; apothecia regular,
shieldlike, pedicelled, sometimes proliferous from the edge
pedicels central, accompanied with cephalodia and sorediae.
VIII. 87. USNEA. Dillenius. Usnea.
Tkallus slightly crustlike, rather cylindrical, branched,
mostly hanging down, enclosing a transparent, central,
elastic, threadlike bundle of ducts ; apotliecia orbiculate,
terminal, shieldlike, eatirely formed of the thallus, and
covered in every part with its cortical substance, keeping
nearly the same colour, circumference without any defined
e^ge, generally fringed.
1. Usnea Jiorida Florid usnea.
Thallus rather upright, rough, pale grey; holdfasts slen-
der, horizontal ; branches very much spread, scarcel}^
branched ; apothecia flat, very broad, whitish, fringed ;
fringe radiating, long.
Liclienoides quod jMuscus arboreus ciun orbiculi?. Rail Syn. 65, 6.
Lichen floridus, Lin. S. P. 1624; Engl. Bot. 872.
Usnea florida, Achar. Meth. Lich. 307 ; Lick. Un. 620.
On trunks of old trees and palings.
^. rigida. Thallus long, stiff, straight, very slender,
rather hanging, rough ; branches rather long, bent,
branched, twiggy.
y. rubiginea. Thallus rather hairy, rusty red : apothecia
of the same colour.
2. Usnea pUcata. Folded usnea.
Thallus hanging, smooth, pale ; branches weak, very
much divided, the last twigs hairlike; apothecia Hat, broad,
fringed ; fringe very fine, very long.
Liclienoides quod Ivluscus arboreus, Usnea ofticinarum, llaii Syn. 6J, 1.
Liclien plicatus, Lin. S. P. 1622; Engl, Bot. 257.
Usnea plicata, Achar. Lich. Univ. 622.
Hairy tree-moiS.
From the trunks and branches of trees.
|3. comosa. Thallus slightly upright, shrublike, pale
white; side branches very much spread, diffuse, smooth,
much divided; last twigs fibrelike, rather rough, slightly
nodding; cepAa/orf^'a pale flesh-colour, growing brown.
Lichen comosus, Achar. N. Act. Stockh. 16,209.
Usnea plicata comosa. Achar. Meth. Lich. 311 ;
2 D S
Lich, Univ. 623.