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Ohio Biological Survey, Bull. 10, Vol. 11, No. 6 - The Ascomycetes of Ohio IV and V by Bruce Fink;Leafy J. Corrington
page 39 of 56 (69%)
10, and 11 are partly diagrammatical.

[Illustration: PLATE XIII.]




THE ASCOMYCETES OF OHIO V[B]


The Peltigeraceae.

LEAFY J. CORRINGTON.


Two genera, _Peltigera_ and _Nephroma_, constitute the _Peltigeraceae_
as represented in the flora of Ohio. The thallus is plainly foliose with
the margins of the lobes usually ascending and is gray-green to brown in
color. The lower surface is often conspicuously veined. There are two
pronounced distinctions between the two genera. _Peltigera_ has a
well-developed cortex on the upper side of the thallus only (Fig. 1),
while in _Nephroma_ there is a well-developed cortex on both upper and
lower sides (Fig. 2).

The position of the apothecia constitutes another distinction. In both
genera the apothecia are marginal or submarginal on the lobes, which are
usually narrow and somewhat extended; but in _Peltigera_ they are
immersed in the upper surface, while in _Nephroma_ they are imbedded in
the lower surface.

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