turing irregularly. Stipe short, stout,
erect, arising from a small, circular hypothallus, whitish or
alutaceous, longitudinally rugulose, expanding at the apex, the wrinkles
running out as veins on the under side of the sporangium; the columella
much flattened, lenticular or discoid, alutaceous or pinkish.
Capillitium of very slender, colorless threads, simple or forking a time
or two, and connected by short branchlets at the extremities. Spores
globose, even, violaceous, 7-9 mic. in diameter.

Growing on sticks, leaves, herbaceous stems, etc. Sporangium .8-1.2 mm.
in diameter, the stipe shorter than the diameter, sometimes very short
or quite obsolete.

8. DIDERMA TESTACEUM, Schr. Sporangia circular or oval, much depressed,
sessile, without any hypothallus, gregarious, irregularly scattered,
sometimes close and even confluent. The outer calcareous layer of the
wall thick, smooth, crustaceous, separate and distinct from the inner
membrane, white or pinkish-white to rose-red in color, gradually
breaking up in pieces and falling away; the inner membrane thin,
pellucid, cinereous from the adherent granules of lime, irregularly
dehiscent from the apex downward. Columella hemispheric or depressed,
granulose-roughened, white, pinkish, or fleshy-red. Capillitium of very
slender, nearly colorless threads, more or less branched. Spores
globose, very minutely warted, 8-10 mic. in diameter.

Growing on old leaves, wood, mosses, etc. Very common in this country.
Sporangium .6-1.0 mm. in diameter, sometimes a little irregular,
especially the form growing on mosses, and occasionally confluent.

9. DIDERMA CINEREUM, Morgan, n. sp. Sporangia subglobose, more or less
irregular, somewhat depressed, sessile, usually close or crowded,
sometimes confluent; the hypothallus a thin membrane, pellucid or with
occasional patches of lime granules, sometimes not apparent. The wall
very thin, even or rugulose, cinereous, the thin membrane covered by a
single layer of closely-adherent granules of lime, rupturing
irregularly. Columella white, hemispheric or depressed and irregular,
the surface granulose. Capillitium of very slender, colored threads, the
extremities pellucid, more or less branched. Spores globose, minutely
warted, violaceous, 9-11 mic. in diameter. Plate XII, Fig. 46.

Growing on old wood, leaves, etc. The sporangium .3-.5 mm. in diameter,
thin and smooth or rugulose. The species superficially greatly resembles
_Physarum cinereu