wn together.
The _Fuligo vaporaria_ Pers., of the green-houses and gardens I have
never seen; the _Mucor septicus_ Linn., was thought to be the plasmodium
of this. Linnaeus's description is simply "_Mucor unctuosus flavus._"

Sec.2. AETHALIOPSIS, Zopf. Aethalium small; lime abundant in the
capillitium, the nodules numerous and large, angular and irregular.

4. FULIGO MUSCORUM, A. & S. Plasmodium effused, golden yellow. Aethalium
small, subpulvinate, irregular, the surface furnished with scattered,
irregular scales of lime, whitish or ochraceous to golden yellow in
color, arising from a thin, white, membranaceous hypothallus. Sporangia
closely packed and grown together; the walls a thin, violaceous
membrane, rugulose, with a thin, closely adherent layer of granules of
lime. Capillitium a loose net-work of tubules, widely expanded at the
angles; the tubules for the most part filled with lime, the nodules
white or yellowish, numerous, very large, angular and irregular,
sometimes confluent with pointed lobes and branchlets. Spores
irregularly globose, minutely warted, dark violaceous, 9-11 mic. in
diameter.

Growing on leaves, twigs, mosses, etc. Aethalium from 2 or 3 mm. to a
centimeter or more in extent. I have a specimen of _Fuligo simulans_
Karsten, from Karsten himself; it is identical with my specimens of
_Fuligo ochracea_ Peck. There could be no better representation of these
specimens made at that time than the description and figure of _Fuligo
muscorum_ A. & S., in the _Conspectus_.

5. FULIGO CINEREA, Schw. Plasmodium milk-white, changing to cinereous.
Aethalium effused, variable in extent, the surface rugulose and
perforate, white, the hypothallus thin or scarcely evident. Sporangia
variously contracted and grown together, forming a dense reticulum; the
walls a thin pellucid membrane, with a thick white outer layer of
granules of lime. Capillitium a loose net-work of tubules, widely
expanded at the angles, the tubules for the most part filled, with lime,
the nodules white, numerous, very large, angular, and irregular, lobed
and branched. Spores globose or oval, minutely warted, dark violaceous,
10-15 x 10-12 mic.

Growing on old leaves, herbaceous stems, etc. I find it most abundantly
about the horse barn, upon the old straw and manure, sometimes running
out onto the green herbage. Aethalium from a few millimeters to several
centimeters in extent. Upon the testimony of Dr. Geo. A. Rex this is
both _Enteridi