ly intact,
crowded with spores.

From England to Iowa; Canada, south to Louisiana and Mexico; apparently,
in one form or another, cosmopolitan.

22. PHYSARUM LILACINUM _Sturgis & Bilgram._

1917. _Physarum lilacinum_ Sturg. & Bilg., _Mycologia_, Vol. IX.,
p. 323.

Sporangia gregarious, stalked, globose, erect, pale-lilac to pale
Indian-red in color, 0.5 mm. in diameter; sporangium-wall membranous,
beset with rounded masses of lilac or reddish lime. Stipe erect,
broad-based, tapering upwards, calcareous, furrowed, paler than the
sporangium or concolorous, 0.7-0.9 mm. long, about 0.1 mm. thick,
columella conical or columnar, capillitium delicate, rigid, persistent;
lime-knots small, rounded, composed of large, pale lilac, or reddish,
spherical granules. Spores pale-brown, almost smooth, 8-9 mu.

Vicinity of Philadelphia,--Bilgram.

23. PHYSARUM MURINUM _Lister_.

1894. _Physarum murinum_ Lister, _Mycetozoa_, p. 41.
1899. _Physarum ravenelii_ (Berk. & C.) Macbr., _N. A. S._, p. 48.
1911. _Physarum murinum_ Lister, _Mycetozoa, 2nd ed._, p. 50.

Sporangia scattered, globose or perfectly spherical, ashy-brown,
rugulose, stipitate; stipe elongate, pale brown, erect, generally
tapering upward, calcareous, brittle; hypothallus none; columella short,
hemispherical or bluntly conical; capillitium dense, much as in _P.
globuliferum_, the calcareous nodules, umber, brownish or orange-yellow,
small; spore-mass brown; spores by transmitted light, bright lilac,
almost smooth, 7-9 mu.

A very distinct species, easily known by its peculiar drab-colored
peridium and dull brown stalks. The author of the species allows for the
capillitial nodes none other tint but brown. Under direct illumination
many gatherings, especially where the sporangia are well blown out, show
nodules of a bright orange tint.

Not rare in the eastern United States, to Missouri and Iowa. Reported
also from western Europe.

Mr. Lister finds _Didymium ravenelii_ Berk. & C., on which _P.
ravenelii_ (Berk. & C.) Macbr. is founded, referable to _P.
pulcherripes_ Pk.

24. PHYSARUM PULCHERRIMUM _Berk. & Rav._

1873. _Physarum pulcherrimum_ Berk. & Rav., _Grev._, II., p. 65.
1875. _Physarum pulcherrimum_ (Berk. & Rav.) Rost., _Mon._, p. 105.
1879. _Physarum atrorubrum_ Peck, _Rep. N. Y. Mus._, XXXI., p. 40.
1899. _Physarum pulcherrimum_ Berk. & Rav., Macbr., _N. A. S._, p. 49.
1911. _Physarum pulcherrimum_ Berk. & Rav., Li