Physarum contextum

Physarum contextum (Pers.) Pers. Syn. Fung. 168. 1801
Diderma contextum Pers. Obs. Myc. 1: 89. 1796.
Didymium contextum Fries, Symb. Gast. 20. 1818.
Leocarpus contextus Fries, Summa Veg. Scand. 450. 1849.
Diderma ochroleucum Berk. & Curt.; Berk. Grevillea 2: 52. 1873.
Chondrioderma contextum Rost.; Fuckel, Jahrb. Nass. Ver. Nat. 27-28: 74. 1873.
Diderma fiavidum Peck, Ann. Rep. N. Y. State Mus. 28: 54. 1876.
Physarum fiavidum A. Berl. in Sacc. Syll. Fung. 7: 350. 1888.
Physarum conglomer aium Massee, Monog. 304. 1892. Not P. conglomeratum Rost. 1874.
Sporangiate or subplasmodiocarpous, sessile, densely crowded, sometimes almost aethalioid, oval, reniform, or elongate, 0.3-0.6 mm. wide; peridium double, the outer layer thick, calcareous, yellow, ochraceous, or pallid, rarely pinkish-buff, the inner layer membranous, pallid or yellowish; capillitium dense, the nodes white; columella none; spores nearly black in mass, deep violet-brown by transmitted light, distinctly and irregularly spinulose, 11-13 y. in diameter; Plasmodium yellow.
Type locality: Germany.
Habitat: Dead leaves and twigs and herbaceous debris.
Distribution: Throughout North America; Europe; India; Japan.