tely warted. Spores in mass
yellow, globose, minutely warted, 8-9 mic. in diameter. See Plate I,
Fig. 20.

Growing on old wood. Sporangium 1.5-2.5 mm. in height, the stipe
variable, but usually much shorter than the sporangium. Scarcely to be
distinguished from _Hemiarcyria ablata_, except by the threads of the
capillitium.

7. HEMIARCYRIA RUBIFORMIS, Pers. Sporangium obovoid or turbinate to
cylindric, usually few to many fasciculate upon the united stipes,
sometimes sessile, brown-red to brown or blackish in color, smooth and
often shining with a metallic luster; the wall much thickened by a dense
brownish-red layer of minute granules, at maturity the apex torn away,
leaving much the greater part persistent. Capillitium of slender
threads, 4-6 mic. in thickness, brownish-red in color, very rarely
branched; the free extremities usually terminated by a stout spine; the
spiral ridges three or four, furnished with numerous spinules. Spores in
mass, brownish-red, globose, minutely warted, 9-11 mic. in diameter.

Growing on old wood; one of the commonest of the Myxomycetes. The
fascicle 3-4 mm. in height, the individual sporangia .5-.6 mm. in
diameter.

8. HEMIARCYRIA SERPULA, Scop. Plasmodiocarp terete, flexuous, usually
branching and anastomosing to form an extensive network, from tawny to
golden-yellow in color; the wall thin above and yellow, breaking open
irregularly and falling away down to the brownish thicker adherent
base. Capillitium consisting of a few long slender threads with
numerous scattered short branches, the threads 4-6 mic. in thickness,
golden-yellow; the free ends of the branches terminating in a slender
spine; the spiral ridges three or four, covered with numerous slender
spinules. Spores in the mass golden-yellow, globose, the surface
reticulate, 10-12 mic. in diameter.

Growing on and inside of rotten wood. Plasmodiocarp an irregular patch,
one to several centimeters in extent, the strands of the net about .5
mm. in thickness. A single reticulate plasmodium is usually converted
without change of form into an individual plasmodiocarp.

II. CALONEMA, Morgan, gen. nov. Sporangia subglobose, irregular,
sessile, without a hypothallus; the wall thin, marked with branching
veins, irregularly dehiscent. Capillitium of slender tubules, arising
from the base of the sporangium, repeatedly branched and with numerous
free extremities; the surface traversed by a system of branching veins,
ending in minut