h pointed lobes and branchlets.

_A. Sporangia stipitate._

15. PHYSARUM IMITANS, Racib. Sporangium depressed-globose, the base
flattened or umbilicate, stipitate, erect or cernuous; the wall a thin
violaceous membrane, with a closely adherent layer of minute granules,
over which are scattered rather large, roundish or irregular white
scales of lime, splitting from the apex downward into a few irregular
segments. Stipe short, thick at the base and tapering upward,
longitudinally rugulose, from gray to brown or blackish, especially
below. Capillitium a loose irregular network of tubules, widely expanded
at the angles; the nodules of lime white, numerous, large, irregular,
with pointed angles and lobes. Spores globose, very minutely warted,
violaceous, 8-9 mic. in diameter.

Growing on old wood, mosses, etc. Sporangium .4-.5 mm. in diameter, the
stipe about the same length or a little longer. The species
superficially resembles the gray form of _Physarum nutans_, and quite
likely is constantly overlooked on this account. Although I am not able
to verify my reference, yet my specimens answer so well to the
description of Raciborski that I am unwilling to invent a new name.

16. PHYSARUM ORNATUM, Peck. Sporangium globose or depressed-globose,
stipitate; the wall a thin yellowish membrane, covered with minute
granules and small irregular scales of lime, yellow to orange in color.
Stipe short, erect, blackish-brown, black at the base, longitudinally
plicate, rising from a small hypothallus. Capillitium of tubules forming
a rather dense net-work, with wide expansions at the angles; the nodules
of lime large, numerous, yellow, irregular, sometimes confluently
branched and reticulate. Spores globose, minutely warted, dark
violaceous, 10-12 mic. in diameter.

Growing on old wood, bark, mosses, etc. Sporangium about .5 mm. in
diameter, the stipe about the same length or shorter. _Physarum oblatum_
McBride, can not be distinguished from this. Specimens of this species
in the herbarium of Schweinitz are labeled _Physarum sulphureum_; this
is without doubt a mistake.

17. PHYSARUM GRAVIDUM, Morgan, n. sp. Sporangium depressed-globose, the
base umbilicate, stipitate; the wall a thin, violaceous membrane,
brownish at the base, with a thin coat of small, white scales and minute
granules of lime. Stipe long, erect, brown or reddish-brown, darker
below, tapering upward, expanding at the base into a small hypothallus.
Capillitium of