ed from Corda,
exaggerate the hypothallus, but otherwise leave nothing to be desired.

As to synonymy, Bulliard has plainly the priority. His figure, t. 446,
Fig. 1, can refer to nothing else, especially reenforced as it is by
Sowerby, _Eng. Fung._, t. 12.

Rather rare on fallen stems of herbaceous plants, but widely
distributed, New England to Oregon and Washington.

11. DIDERMA SAUTERI (_Rost._) _Macbr._

1875. _Chondrioderma sauteri_ Rost., _Mon._, p. 181.
1891. _Chondrioderma aculeatum_ Rex, _Proc. Phil. Acad._, p. 390.

Sporangia scattered, gregarious, sessile, lenticular or hemispherical,
flattened above and sometimes concave or umbilicate below, dusky or
yellowish white, the outer peridium papyraceous, thin, occasionally
wrinkled, rupturing irregularly, remote from the inner, which is thin,
delicate, semi-transparent, grayish, rarely iridescent; hypothallus
none; columella irregular, sometimes small and hardly evident, rugose,
with spine-like processes, the persisting bases of the capillitial
threads, reddish brown; capillitium scanty, white, or colorless, simple
or sparingly branched; spores dark violaceous, spinulose, 12-13 mu.

This is _Chondrioderma aculeatum_ Rex, _Proc. Acad. Nat. Sci. Phil._,
1891, p. 390. After careful comparison of specimens and various
descriptions, especially that of Rostafinski with the type specimens of
Dr. Rex, I am constrained to concur with Lister in adopting
Rostafinski's name. The sporangia in the type specimens (Rex) are on
moss, borne at the extreme tips of acuminate or aculeate leaves, so that
at first sight they appear stipitate.

Apparently rare. Maine, New York.

12. DIDERMA COR-RUBRUM _Macbr. n. s._

PLATE XVIII., Fig. 2

Sporangia gregarious clustered, small .5-.7 mm., sessile
corrugate-plicate, especially above, snow-white, the outer peridium
cartilaginous polished without and within, the inner delicate,
evanescent; columella well developed, globose or clavate, anchored by
several stout transverse trabeculae to the peridial wall, papillate,
deep-red as is the peridium especially below; capillitium very delicate,
sparingly branching, colorless; spores verruculose, fuliginous tinged
with red, about 12 mu.

This curious but elegant little species is represented by a single
colony collected by Professor Morton Peck in Iowa. It resembles _D.
sauteri_ but is distinguished by the plicate white wall, the stout
columella with its lateral extensions, as by