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a rare plant, which is partly accounted for from the singularity
of its actual station. Four species only are published ; but I
have received a fifth named O. faginea from my friend^ M.
F r i e s .
The most remarkable feature in the genus is the structure
of the peridium, which is partly fibrous and partly crustaceous,
and the somewhat permanent compactness of the mass of sporidia,
which require the influence of the atmosphere for their
dispersion.
Fig. 1. 0. equina, natural size. Fig. 2. Plants in different
A plant divided. Fig. 4. Sporidia ; magnified.
:. Fig. 3.
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