imes by confluence
branched and reticulate; the wall a firm yellowish membrane, with a
thin, rough, closely adherent coat of granules of lime, dull ochre to
lemon-yellow and orange in color. Capillitium a dense net-work of
tubules, for the most part filled with lime, only here and there short,
slender, empty spaces; the nodules large, numerous, white or yellow,
angular and with pointed lobes and branchlets. Spores globose, minutely
warted, dark violaceous, 9-11 mic. in diameter.

Growing on leaves, bark, lichens, etc. Plasmodiocarp .3-.4 mm. in
thickness and of varying length. This species is in the herbarium of
Schweinitz, at Philadelphia, with the name _Physarum reticulatum_; it is
described by George Massee as _Physarum gyrosum_; by Lister it is
incorporated with several other species under _Badhamia decipiens_.

28. PHYSARUM CONTEXTUM, Pers. Sporangia sessile and closely crowded
together, roundish or more or less elongated, flexuous and complicate,
the apex plane or impressed; the wall a firm yellowish membrane, covered
by a thick pulveraceous layer of lime, white, ochraceous or yellow,
easily crumbling and breaking up. Capillitium a loose net-work of
tubules, much expanded at the angles; the nodules of lime very large,
white or yellow, numerous, angular, and irregular, by confluence lobed
and branched, sometimes massed together in the center of the sporangium.
Spores globose, minutely warted, dark violaceous, 10-13 mic. in
diameter.

Growing on bark, leaves, mosses, etc. Sporangia with a width of .3-.5
mm. and varying in length from .5 mm. to 1 or 2 mm. The sporangia are
often so much crowded as to appear to be grown together. _Diderma
ochroleucum_ B. & C. belongs to this species. _Physarum conglomeratum_
Fr. is a closely related species, with smaller and smoother spores. I
have not met with this.

29. PHYSARUM DIDERMA, Rost. Sporangia large, irregularly globose or
oblong, sessile, but without a hypothallus, closely crowded together and
sometimes confluent. The wall composed of two distinct and separate
layers; the outer a thick, uneven, crustaceous, snow-white layer of
lime; the inner a thin, violaceous membrane, cinereous from the adherent
granules of lime, or free from them, and iridescent. Capillitium of
tubules forming a loose net-work, with wide expansions at the angles;
the nodules of lime numerous, snow-white, large, irregular, with pointed
angles and lobes, sometimes confluent in the center of the spor