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MYSTERIUM v a r i ü m .
Irregular Hysterium.
C l a s s a n d O r d e r CRYPTOGAMIA FUNGI, i i™ .— N a t . O r d . HYPOXYLA,
De Cand.
GEN ERIC CHARACTER.
Crusta nulla. Perithecium plerumque oblongum, corneum, jima longitudinali de-
kiscens. Sporidia in tubulis hyalinis, ehngatis, erectis, gelatinosis.
Crust none. Perithecium mostly oblong, corneous, bursting by a longitudinal
opening. Sporidia contained in hyaline, elongated, erect, gelatinous
tubes.
S PE C IF IC CHARACTER.
H y s t e r i u m varium ; superjiciale, lineare, oblongum vel subrotundum, obtusum,
nigrum ; labiis obtusis “ demum apertis.”
H. superficial, linear, oblong or roundish, obtuse, black ; margins obtuse,
“ at length open.”
H y s t e r i u m v a r i u m , Fries, Syst*Mycol. v . 2. p. 582.
Hab. On Oak trees. Appin, Captain C a r m i c h a e l .
Perithecia gregarious, black, dull, superficial, very variable in form, linear,
oblong, elliptical, or roundish, rarely more than a line in length, sometimes
considerably elevated, obtuse at both extremities, Fips or margins
rounded, obtuse, closed, “ at length open.” Sporidia oval.
This polymorphous species is here added to the British
Flora hy my iudefatigahle frieud Captain C a r m ic h a e l , whose
discoveries have so frequently enriched the present publication.
I t wiis marked by him as a new species (probably before the second
volume of F r ie s ’s System had appeared); but I have
little hesitation in referring it to H . varium, with which it
agrees in all important points.
Fig. 1. H. varium, natural size. Fig. 2. Perithecia o f different farms.^ Fig. 3.
Other perithecia, one o f them vertically divided. Fig. 4. Thecæ, intermixed
with Paraphyses and Sporidia /—more or less magnified.