hape, from one to several centimeters in extent, the individual
sporangia 2-4 mm. in height. Plasmodium at first milky-white, soon
changing to bright red, then to umber, becoming paler when mature and
dry.

2. TUBULINA CASPARYI, Rost. Sporangia more or less elongated, closely
crowded and prismatic, connate, pale umber to brown in color, seated on
a conspicuous hypothallus; the wall thin, firm, minutely granulose,
semi-opaque, pale umber, iridescent when well matured; all or many of
the sporangia traversed by a central columella, from which a few narrow
bands of the membrane stretch to the adjacent walls. Spores in the mass
pale umber to brown, globose, the surface reticulate, 7-9 mic. in
diameter.

Growing on old prostrate trunks. AEthalium two or three to several
centimeters in extent, the individual sporangia 3-5 mm. in height.
Plasmodium white, the immature sporangia dull-gray tinged with sienna
color. The columella, with its radiating bits of membrane, is the same
substance as the wall; it may be a reentrant edge of the prismatic
sporangium, caused by excessive crowding together; at least, this may be
regarded as its origin; there may have arisen some further adaptation.
The species is _Siphoptychium Casparyi_, Rost. I am indebted to Dr.
George A. Rex for the specimens I have examined.

3. TUBULINA CAESPITOSA, Peck. Sporangia short-cylindric, closely crowded,
distinct or connate, argillaceous olive to olive-brown in color, seated
on a well-developed hypothallus; the wall a thin membrane, with a dense
layer of minute dark-colored round granules on the inner surface. Spores
argillaceous olive in the mass, globose, minutely warted, 6-8 mic. in
diameter.

Growing on old wood. AEthalium in irregular patches sometimes several
centimeters in extent, the single sporangia about 1 mm. in height.
Plasmodium dark olivaceous, the sporangia blackish if dried when
immature, taking a paler shade of olivaceous, according to development
and maturity. This is _Perichaena caespitosa_, Peck, in the 31st N. Y.
Report.

III. LYCOGALA, Mich. AEthalium with a firm membranaceous wall; from the
inner surface of the wall proceed numerous slender tubules, which are
intermingled with the spores. The material of the wall appears under
three different forms: the inner layer is a thin membrane, uniform in
structure, of a yellow-brown color, and semi-pellucid; the outer layer
consists of large flat roundish or irregular vesicles, brown in co