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O PEG RAP HA rubella.
Reddish Opegrapha.
CRYPTOGAMIA Algce.
Gen. Char. Seeds in black, linear, sessile, simple or
branched,bordered clefts, in an uninterr u pted crust.
Spec. Char. Crust continued, limited, reddish ash-
coloured, slightly rugged. Clefts short, rounded,
somewhat curved, their disk broader than the borders.
Svn. Opegrapha rubella. P e r s .inU s t.A n n .fa sc . 7.
3 \ . t . \. f . 2 ,A , a . Ach. Meth. 2 i . Winch, v. 2 .30.
Lichen rubellus. Ach. Prodr. 22.
O n the trunks of large trees ; communicated by Mr. Turner.
Mr. Winch has thought this scarcely distinct from
0 , vulgata, l. 1811, but we find sufficient differences. The
crust of the present is more uninterrupted, of a reddish smoky
hue. Clefts regularly scattered all over it, like dots, numerous,
short, rounded, almost all separate; their disk black, flattened,
at least as broad as the margins, frequently broader. Persoon’s
figure represents the clefts more pointed at each end than we
find them, but we see no material cause to suspect his synonym,
upon which that of Acharius solely depends.
We have now published every species of this genus, known
to be British, except 0 . conglomerata and congesta.