Physarum notabile

Physarum notabile Macbr. N. Am. Slime-Moulds
ed. 2. 80. 1922.
Didymium connatum Peck, Ann. Rep. N. Y. State Mus. 26: 74. 1874.
Physarum connexum sensu Morgan, Jour. Cine. Soc. Nat. Hist. 19: 20. 1896. Probably not P.
connexum Link, 1809. Physarum connatum G. Lister in Lister, Mycet. ed. 2. 71. 1911. Not P. connatum Schum. 1803,
nor P. connatum Ditmar, 1817,
Sporangiate to plasmodiocarpous; sporangia gregarious, globose to reniform, stalked or sessile on a constricted base, 0.3-1 mm. in diameter, the sporangiate forms merging into short plasmodiocarps, the fructifications often clustered into closely compacted groups of 3-10 within the larger groups; peridium membranous, densely incrusted with ashywhite calcareous deposits; stalk, when present, irregular, usually tapering upward, deeply plicate-furrowed, opaque, dark or covered with white calcareous granules; capillitium abundant, the nodes variable in size and shape, connected by rather long hyaline threads, the junctions not always nodulose; spores black in mass, dark sooty-brown by transmitted light, minutely papillose, 10-11.5 n in diameter; Plasmodium white or gray.
Type locality: Portville, New York. Habitat: Dead wood and bark.
Distribution: Northern United States and Canada; Brazil; Europe.