Physarum penetrale Rex 1891

Physarum penetrale Rex, Proc. Acad. Phila. 1891: 389. 1891
Cytidium penetrale Morgan, Jour. Cine. Soc. Nat. Hist. 19: 11. 1896.
Sporangia stipitate, scattered, globose to ellipsoidal or pyriform, 0.4-0.6 mm. in total height, 0.3-0.4 mm. in diameter, erect or nodding; peridium greenish-gray to yellowish-green, sparsely studded "with rounded, pale yellow to yellowish-gray calcareous scales, rupturing to the base in two to four segments; capillitium dense, persistent, the nodes rounded, pale yellow, fading to white; columella reaching to about four-fifths the height of the sporangium, acuminate, or enlarged at the tip, orange-brown to dull yellow or pallid; stalk variable in height, slender, subulate, rugulose, translucent, not calcareous, dull red or orange-brown, often flattened laterally at the base; spores brown in mass, brownish-lilac by transmitted light, very minutely spinulose, 6-7 /t in diameter; Plasmodium orange-yellow.
Typk locality : Philadelphia, Pennsylvania.
Habitat: Dead wood and moss.
Distribution: Maine to Ontario, south to North Carolina and Iowa, and in Washington and