CRYPTOGAM1A Alga;.
G en. Char. M ale, scattered warts.
Female, smooth shields or tubercles, in which llie
seeds are imbedded.
Spec. Char. Crust leprous, th in , scattered, greyish-
white . Shields slightly convex,irregularly shaped,
rusty-black, with a grey bloom when dry, and a
th in , black, smooth border.
Syn. L ich en pruinosus. Ach. Prod. 77.
L. pru in atu s. Dicks. Crypt, fasc. 3. 15. t. 9. f . 4.
With. v. 4. 20. Hull. 290.
Lec idea pruinosa. Ach. Meth. 55. Winch, v. 2.3 5 .
GrATHERED on a limestone wall near Gain ford, Durham,
by the Rev. Mr. Harriman, and communicated to us by Mr.
Winch, who justly observes that the pf crust is white or ash-
coloured,” not reddish nor rusty, except probably from the
action of some animal matter falling upon it. 1 he substance
is very thin, leprous and dispersed, inseparable from the stone.
Shields variously scattered, often clustered, sessile, rather depressed,
various in size and shape; their disk somewhat convex
; when wet of a rusty brown, redder within; when dry
black, with a peculiar grey bloom, like that of a plum. Their
border is thin, smooth, entire and black. It is a rare species,,
not generally known to botanists, either in this country or
abroad.
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