Plasmodium white; sporangia greyish-white, obovoid or wedge-shaped, .7 mm. in diameter, clustered or scattered, stipitate or sessile, when stipitate stalks long, weak; peridium membranous, pale purple; capillitium a persistent rigid net, the nodules white, rounded, sometimes aggregate as a pseudo-columella; spores purple-brown, 10-11 mu, warted, the papillae in definite patches. Related to _P. compressum_. Reported from England; Germany. PHYSARUM CRATERIFORME _Petch._ _Physarum crateriforme_ Petch, _Ann. Perad._, IV., p. 304. _Physarum crateriforme_ Petch, List., _Mycetozoa, 2nd ed._, p. 69, Pl. 76. Sporangia gregarious, globose, clavate or crateriform, sessile or stipitate, white; stalk when present opaque conical, black below, white above, in crateriform sporangia entering and developed as a columella; capillitium various, strongly calcareous, the nodules either grouped in a pseudo-columella, or in globose sporangia, rod-like, ascending; spores closely spinulose, 11-15 mu. Reported from Ceylon, Japan, West Indies; Lisbon. PHYSARUM GULIELMAE _Penzig._ 1898. _Physarum gulielmae_ Penzig., _Myx. Beut._, p. 34. 1909. _Physarum gulielmae_ Penzig., Torrend, _Fl. des Myx._, p. 208. 1911. _Physarum gulielmae_ Penzig., List., _Mycetozoa, 2nd ed._, p. 76. Plasmodium yellow; sporangia sub-globose, sessile, brownish-orange or chestnut brown, rugulose, clustered or heaped, often with a yellow membranous hypothallus; peridium membranous with clustered deposits of yellowish-brown lime granules; capillitium abundant, the nodes angular, branching, white; spores purplish brown, spinulose, 10-12 mu. Reported from Java, Sweden, Switzerland. PHYSARUM ECHINOSPORUM _List._ 1899. _Physarum echinosporum_ List., _Jour. Bot._, XXXVII., p. 147. This species is distinguished from the preceding chiefly in episporic characters. "Spores purple, 8 mu, marked by strong ridges and spines," 8 mu. Reported from Antigua. PHYSARUM AENEUM (_List._) _R. E. Fries._ 1898. _Physarum murinum_ var. _aeneum_ Lister, _Jour. Bot._, XXXVI., p. 117. 1903. _Physarum aeneum_ Lister, R. E. Fries, _Arkiv. Bot._, I., p. 62. Sporangia sessile, sub-globose or plasmodiocarpous, pinkish-brown or bronze, glossy; peridium double, the outer somewhat cartilaginous, brittle, falling back from the shining, membranous inner wall; capillitium dense, the nodules not large, brown, sometimes aggregated to form a pseudo-columella; spores pale brownish-violet, nearly smooth, 6-8 mu. Reported from West Indies, Bolivia. =Related Genus= TRICHAMPHORA _Junghuhn_, p. 12. 1838. _Trichamphora_, Junghuhn, _Fl. Crypt. Javanica_. Sporangia discoidal, above concave, saucer-shaped, stipitate; the capillitium variable, anon physaroid, badhamioid, or even as in _Didymium_.