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. 6. 1879. _Physarum albicans_ Peck, _Rep. N. Y. Mus._, XXX., p. 50. 1893. _Physarum columbinum_ Macbr., _Bull. Lab. Nat. Hist. Iowa_, II., 384. 1899. _Physarum globuliferum_ (Bull.) Pers., Macbr., _N. A. S._, p. 45. 1911. _Physarum globuliferum_ Pers., Lister, _Mycetozoa, 2nd ed._, p. 48.