p. 83.
1899. _Physarum melleum_ (Berk. & Br.), Mass., Macbr., _N. A. S._,
p. 47.
1911. _Physarum melleum_ Mass., Lister, _Mycetozoa, 2nd ed._, p. 46.

Sporangia scattered, stipitate, globose, flattened below, clear yellow
or honey colored; stipe short, about equaling the sporangium, pure
white, somewhat wrinkled; columella small but distinct, white;
hypothallus none, capillitium abundant, open, snow-white, with rather
large angularly stellate nodes; spore-mass brown, almost black; spores
by transmitted light, pale violet or lilac-tinted, almost smooth, 7.5-10
mu.

Easily distinguished by its white stipe, columella and capillitium in
contrast with yellow peridial walls. _N. A. F._, 1395. Massee refers
this number erroneously to _P. schumacheri Rost._ The description and
specimen do not correspond. By that name the species has however, been
hitherto known in the United States.

Eastern United States, common; rare west of the Mississippi.

Reported from Brazil, Japan and the tropic islands round the world.
Portugal.

20. PHYSARUM CITRINUM _Schumacher_.

1803. _Physarum citrinum_ Schum., _Enum. Pl. Saell._, II., p. 201.
1911. _Physarum citrinum_ Schum., List., _Mycetozoa, 2nd ed._, p. 51.

Sporangia gregarious, scattered, globose, somewhat flattened below, pale
yellow, citrine, stipitate; the peridium thin, covered almost completely
with small calcareous scales; stipe stout, erect, fragile, tapering
upwards, furrowed, opaque, arising from a small hypothallus which is
anon continuous from one sporangium to the next; columella small,
conical, yellow; capillitium a rather dense, delicate network, the
calcareous nodules yellow, numerous, roundish, and generally small;
spore-mass black; spores under the lens violaceous, almost smooth, about
8 mu.

This species seems to be rare in the United States. It resembles
somewhat _P. melleum_, from which it is distinguished by its yellow
stipe. _P. galbeum_ is a smaller form, and lacks the columella.
Rostafinski strangely confused the synonymy here, including even _P.
rufipes_ Alb. & Schw.

New England, Ohio, Colorado.

21. PHYSARUM GLOBULIFERUM (_Bull._) _Pers._

1791. _Sphaerocarpus globuliferus_ Bull., _Champ._, Pl. 484, Fig. 3.
1801. _Physarum globuliferum_ Pers., _Syn._, p. 175, T. III.,
Figs. 10, 11, 12.
1829. _Diderma globuliferum_ Fries, _Syst. Myc._, III., p. 100.
1876. _Physarum petersii farlowii_ Rost., _Mon., App._, p