g, ascending, brownish in color, usually several
fasciculate or to some extent connate, the sporangia divergent at the
apex. Capillitium not much expanded after dehiscence, cylindric, pale
cinereous, or pale yellowish; the threads variable in thickness. 2-4
mic., those at the surface densely and minutely warted, those of the
interior nearly smooth. Spores globose, even, 6-8 mic. in diameter.

Growing on old wood. Capillitium 2-4 mm. long, the stipe about the same
length. _Arcyria bicolor_, B. & C.

III. HETEROTRICHIA, Massee. Sporangia regular, oblong-ovoid, stipitate;
the wall a thin delicate membrane, the upper part disappearing at
maturity, leaving the basal portion as a small calyculus. Stipe filled
with large thick-walled vesicles, which are sub-angular from mutual
pressure; these become smaller upward, and pass gradually into normal
spores. Capillitium issuing from the interior of the stipe, the central
and superficial threads dissimilar, forming a complicated network, with
numerous free extremities, the surface minutely warted, or with annular
ridges. Spores globose, brownish.

Distinguished from Arcyria by the numerous free extremities of the
peripheral portion of the network.

1. HETEROTRICHIA GABRIELLAE, Massee. Sporangium oblong-ovoid, stipitate;
the calyculus small, thin, smooth. Stipe very short, erect,
yellowish-brown in color. Capillitium much elongated after dehiscence,
cylindric-ovoid, sub-erect; the threads of the central portion about 1.5
mic. thick, with slightly elevated ridges partly encircling the tube,
nearly colorless; threads of the peripheral portion bright yellow, 5-6
mic. thick, with numerous short acute free branches, the surface densely
and minutely warted. Spores in mass, yellowish-brown, globose, even, 7-8
mic. in diameter. See Plate I, Fig. 18.

Growing on wood; S. Carolina, _H. W. Ravenel_. The sporangia densely
crowded, becoming scattered toward the margin of the cluster. Massee's
Monograph of the Myxogasters.

ORDER V. TRICHIACEAE.

Sporangium regular and stipitate or sessile, rarely plasmodiocarp; the
wall a thin membrane, usually granular or venulose on the inner surface,
colored as the spores and capillitium, irregularly dehiscent.
Capillitium of slender tubules, simple or branched, scarcely forming an
evident network; the surface of the threads furnished with continuous
ridges, which wind around the tube in a spiral manner. Spores globose,
red, brown, yellow, ol