P E Z IZ A ERUMPENS.
Sycamore-petiol Peziza.
CI.ASS AND O nD E R CRYPTOGAMIA FUNGI, Linn—N a t . O r d . FUNGI, Link,
Gi'ev.
GEN ERIC CHARACTER.
Pileus stipitatus aut sessilis, plus minusve cupuliformis vel complanatus, tubulis
elongatis sporulferis in pagina superiorc.
Pileus sessile or stipitate, dilated upwards into a variable cup-sbaped or flat-
tisb receptacle, having sporules contained in elongated tubular cells,
whose summits terminate at the superior surface.
S P E C IF IC CHARACTER.
P eziza erumpens ; minuta, ceracea, glaberrima, sessilis, cinerea, sub cortice
Aceris Pseudo-Platani petiolorum subputridorum inclusa, tempeslate húmida
solùm erumpens.
P. minute, ceraceous, glabrous, sessile, grey, concealed beneath the bark
of the semiputrid petiolsof Acer Pseudo-Platanus, and bursting through
it only in moist weather.
H ab. On the fallen petiols of the Sycamore ( Acer Pseudo-PlatanusJ, late in
the autumn. Auchindenny woods, near Edinburgh.
In dry weather, nothing is perceptible but oblong or elliptical black spots,
to the naked eye resembling an Hysterium. In moist weather, the
plant makes its appearance, by gradually distending the small slit in
the bark of the petiol, till it attains its round form, when the margin
projects over the edge of the fissure ; in the absence of moisture, the
whole again contracts and becomes invisible. Pileus very minute, of a
grey colour, and waxy-watery substance, glabrous, rather thin, round,
entire, margin none when expanded. Hymenium slightly concave, the'
tubular cells filiform.
The present new species of Peziza was discovered wholly
by accident. I had brought home the petiols of the Sycamore
from Auchindenny woods, under the persuasion that the plants
upon them were probably an nndescribed species of Hysterium.
r