PL cell. aph. 3. HOMQTHALAMEiE. 87. Usnea. 403 
B. UsNEADEiE. Phallus 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. 
Phallus slightly crustlike, rather cylindrical, branched, 
mostly hanging down, enclosing a transparent, central, 
elastic, threadlike bundle of ducts ; apothecia orbiculate, 
terminal, shieldlike, entirely formed of the thallus, and 
covered in every part with its cortical substance, keeping 
nearly the same colour, circumference without any defined 
edge, generally fringed. 
1. Usnea Jlorida. Florid usnea. 
Phallus rather upright, rough, pale grey; holdfasts slen- 
der, horizontal ; branches very much spread, scarcely 
branched ; apothecia flat, very broad, whitish, fringed ; 
fringe radiating, long. 
Lichenoides quod Muscus arboreus cum orbiculis, Raii Syn. 65, 6. 
Lichen floridus, Lin. S. P. 1624; Engl. Bot. 872. 
Usnea florida, Achar. Meth. Lich. 307 ; Lich. Un. 620. 
On trunks of old trees and palings. 
j3. rigida. Phallus long, stiff, straight, very slender, 
rather hanging, rough ; branches rather long, bent, 
branched, twiggy. 
y. rubiginea. Phallus rather hairy, rusty red ; apothecia 
of the same colour. 
2. Usnea plicata. Folded usnea . 
Phallus hanging, smooth, pale ; branches weak, very 
much divided, the last twigs hairlike ; apothecia Hat, broad, 
fringed ; fringe very fine, very long. 
Lichenoides quod Muscus arboreus, Usnea officinarum, Raii Syn. 64, 1. 
Lichen plicatus, Lin. S. P. 1622; Engl. Bot. 257. 
Usnea plicata, Achar. Lich. Univ. 622. 
Hairy tree-moss. 
From the trunks and branches of trees. 
£. comosa. Phallus slightly upright, shrublike, pale 
white; side branches very much spread, diffuse, smooth, 
much divided; last twigs fibrelike, rather rough, slightly 
nodding; cephalodia pale flesh-colour, growing brown. 
Lichen comosus, Achar. N. Act. Stockh. 16,209. 
Usnea plicata comosa, Acliar. Meth. Lich. 3 11 ; Lich. Univ. 623. 
2 D 2 
