ut lime, rising from a small
concolorous hypothallus; columella none; capillitium dense, crowded with
calcareous, brilliant orange nodules which are angular in outline and
tend to aggregate at the centre of the sporangium; spore-mass brown;
spores by transmitted light, pale brown, slightly but plainly warted,
about 10 mu. _N. A. F._, 2492.

Differs from _P. pulcherripes_ Pk. in external coloration, the peridium
a rich blue, mottled but not with lime; in the capillitium, dense,
calcareous, with large angular or branching nodes; in the stipe without
lime; in the spores, a little larger than in _P. pulcherripes_, and by
transmitted light much more distinctly brown in color. The sporangia are
also broader in the present species, reaching 1 mm.

Rare. Maine, New York, Massachusetts, Pennsylvania. Reported common in
Europe, Ceylon, Japan, etc.

32. PHYSARUM DISCOIDALE _Macbr. n. s._

PLATE XX., Figs. 3 and 3 _a_.

Sporangia gregarious, scattered, discoidal, depressed or umbilicate
above, sometimes almost annulate, snow-white, small, .5-.7 mm.,
stipitate; stipe about twice the sporangium, pale yellow, strand-like,
but erect, even; hypothallus none; columella none; capillitium strongly
calcareous, almost as in _Badhamia_, aggregate at the center, and
forming a pseudo-columella at the base of the peridium; peridial wall
firm, covered with innate patches of lime, somewhat yellow at the base;
spores minutely spinulose, violaceous, 7-9 mu.

This little species reaches us from California. It appears in late
winter in undisturbed grass tufts and the sporangia are scattered over
the lower leaves. It displays a remarkable amount of lime. The nodules,
however, are not large; they are rounded and connected here and there by
the ordinary retal tubules characteristic of a physarum.

33. PHYSARUM LEUCOPHAEUM _Fr._

1818. _Physarum leucophaeum_ Fr., _Symb. Gast._, p. 24.
1875. _Physarum leucophaeum_ Fr., Rost., _Mon._, p. 113, Figs. 77, 78.
1899. _Physarum leucophaeum_ Fr., Macbr., _N. A. S._, p. 21.
1911. _Physarum nutans_ Pers., sub-species _leucophaeum_ (Fr.) Lister,
_Mycet., 2nd ed._, p. 67.

Sporangia scattered or gregarious, stipitate; the peridium globose or
sub-depressed, plano-convex, but never umbilicate below, erect,
bluish-ashen; the stipe short, rugose, sub-sulcate, fuscous, brown, or
sometimes almost white, even or slightly attenuate upward from a
thickened base or sometimes from an indistinct