or three times as long. It is _Badhamia
nodulosa_ C. & B., _Journal of Mycology_, Vol. V, p. 186. Ravenel's
specimens are on _Acacia_ bark. Mr. Webber sent me elegant specimens
from Florida where, he says, it grows commonly on the leaves and bark of
the orange trees.

8. CRATERIUM MAYDIS, Morgan, n. sp. Sporangium globose or obovoid,
stipitate; the upper part of the wall a yellowish membrane, thin and
fragile, covered with large thick scales and nodules of lime,
amber-colored to golden-yellow; the basal portion thicker and more
persistent, naked and plicate, red-brown. Stipe red-brown, long,
slender, plicate, rising from a small hypothallus. Capillitium of thick
tubules, forming a net-work with wide expansions at the angles; the
nodules of lime large, numerous, yellow, angularly lobed and branched.
Spores globose, very minutely warted, pale violaceous, 9-10 mic. in
diameter.

Growing on old stalks of _Zea mays_. Sporangium with the stipe 1-1.5 mm.
in height and .4-.6 mm. in diameter, the stipe always longer than the
sporangium. I find it in abundance on old stalks of Indian corn, but
never on anything else.

VII. PHYSARUM, Pers. Sporangium globose, depressed globose or irregular,
stipitate or sessile; the wall a thin membrane, with an outer layer of
minute roundish granules of lime, irregularly dehiscent. Stipe present
or often wanting, never prolonged within the sporangium as a columella.
Capillitium of slender tubules, forming an intricate net-work, the
extremities attached on all sides to the wall of the sporangium; the
tubules more or less expanded at the angles of the net-work, and
containing at varying intervals nodules of lime. Spores globose,
violaceous.

_Physarum_ is the central genus of the _Physaraceae_ from which all the
others are detached by characters which for the most part are
unimportant.

Sec.1. LAPIDIUM. Lime in the Capillitium scanty; the nodules small,
roundish, ellipsoidal or fusiform.

_A. Sporangium stipitate._

_a. Sporangia regular._

1. PHYSARUM NUTANS, Pers. Sporangium orbicular, very much depressed, the
base concave or umbilicate, stipitate, cernuous; the wall a thin
pellucid membrane, thickly covered with minute white or yellow roundish
scales of lime, breaking up into irregular fragments, which often remain
attached to the capillitium. Stipe long, slender, tapering upward, bent
or curved at the apex, longitudinally rugulose, brown or blackish at the
base, becoming paler up