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CRYPTOGAMIA Algce.
Gen. Char. Receptacles shapeless, without a border,
hairy and powdery, in an uninterrupted crust.
Spec. Char. Crust very thin, leprous, hoary, with a
brown edge. Receptacles minute, indeterminate,
finely branched, somewhat confluent, brownish-
black.
Syn. Spiloma microclonium. Sm. FI. Brit. v. 4. ined.
S. microclona. Ach. Meth. Suppl. 5.
D is c o v e r e d by Mr. Sowerby, many years ago, on the
ragged trunks of aged oaks in Windsor forest. Mr. W. Borrer
finds it in Sussex.
The white or hoary thin leprous crust overruns the inequalities
of the bark, and is terminated by a remarkable brown
undulated border. The fructification looks as if snuff, or
wood soot, had been sprinkled over the crust, or swept into
the clefts of the bark, but when highly magnified, it seems
composed of innumerable minute ramifications, that discharge
a dark powder when arrived at maturity.
ziso.
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