LICHEN debilis.
Weak Tin-headed Lichen.
CRYPTOGAMIA Algce.
Gen. C h a r . Male, scattered warts.
Female, smooth shields or tubercles, in which the
seeds are imbedded.
S p e c . C h a r . Crust membranous, very thin, white.
Tubercles black, convex with a recurved margin,
on long, slender, w a v y , black stalks.
S y n . Calicium debile. Turn, and Borr. Mss.
Coralloides fungiibrme arboreum nigrum, vix crus-
tosum. Dill. Muse. / 8. t. 14. f . 3 A?
O b s e r v e d by Mr. W. Borrer on old timber, frequently
under the eaves of thatched buildings, where, its thin white filmy
crust often spreads very widely. The fructification is copious,
consisting of very black, opaque, more or less convex tubercles,
whose margin is reflexed, and which are each supported by a
black, slender, wavy stalk, occasionally forked or divided, sometimes
polished, sometimes not.
Mr. Borrei- indicates the above synonym ofDillenius; but the
magnified part of the figure seems different, as well as the portion
marked B.
We are well aware that the genus Calicium must finally be
adopted, and we merely for the present refer its species, as
heretofore, to Lichen.