ward and cinereous or whitish at the apex.
Capillitium of very slender threads, rising from the base of the
sporangium, forming a net-work with much elongated meshes, scarcely
expanded at the angles; the nodules of lime white or yellow, ellipsoidal
or fusiform, often very small and few in number, sometimes rather large
and numerous. Spores globose, very minutely warted, violaceous, 8-10
mic. in diameter.

Growing on wood, bark, mosses, etc. A very common species. Sporangium
.4-.5 mm. in diameter, the stipe 1-2 mm. in length, the lime-nodules
commonly not thicker than the spores, but sometimes from once to twice
their diameter. Under this name I have included all the lenticular
species of Persoon's Synopsis, _Physarum nutans_, _P. luteum_, _P.
viride_ and _P. aureum_. There is no difference in these species, except
in the color of the granules of lime; the form of the sporangium and the
shape and color of the stipe are the same in all of them. No two
authorities agree in the presentation of this species.

2. PHYSARUM CUPRIPES, B. & R. Sporangium orbicular, much depressed, the
base umbilicate, stipitate, cernuous; the greater part of the wall thin
and delicate, with a scanty covering of yellow granules of lime,
becoming naked and then brassy and iridescent, after maturity soon
disappearing; the lower basal portion thicker and more persistent, with
a layer of small yellow scales of lime. Stipe long, flexuous, bent at
the apex, plicate, pale brown to yellow-brown, darker toward the base.
Capillitium of slender tubules, forming a dense persistent net-work,
more or less expanded at the angles; the lime-nodules small, numerous,
yellow, angular and fusiform, below often confluent. Spores globose,
very minutely warted, violaceous, 8-10 mic. in diameter.

Growing on old wood; rare. Sporangium .4-.5 mm. in diameter, the stipe
two or three times this length. The lime nodules are found both on the
sides and at the angles of the meshes, and are fusiform or angular
accordingly; the lime is scanty above, but in the lower part of the
capillitium the nodules sometimes run together into lobed and branched
forms. This is _Physarum berkeleyi_ of Rostafinski's monograph.

3. PHYSARUM OBRUSSEUM, B. &. C. Sporangium globose, the base usually
slightly flattened or umbilicate, stipitate and cernuous; the wall a
thin, violaceous membrane, covered by small, roundish, white or yellow
scales of lime, or sometimes naked, splitting irregularly from