Bean—The Myxomycetes of Wisconsin. 1227 
Mac,bride’s description is almost identical with Saccardo’s, but 
he adds that the outer peridium, especially its upper part, is en¬ 
tirely evanescent. 
Lister says that the capillitium has scanty hyaline threads 
connecting the branching lime-knots. He calls the spores dark 
violet-brown. He states that Rostafinski was the first to detect 
and point out that in P. context inn the spores are rough and 
measure 10-1 3 m, while in P. conglomeratum they are nearly 
smooth and meashre 8-9y in diameter. 
Massee differs from Lister only in the dimensions of spores, 
which he finds to be 11-14/* in diameter. He says this species is 
known from P. comjlomeratum by the denser capillitium of num¬ 
erous large, irregular lime-knots, and the larger sporangia usu¬ 
ally of a pale lemon yellow, sometimes with a very faint tinge of 
green. 
My specimens agree very closely with the above quoted descrip¬ 
tions. 
I have two specimens which I found in Cemetery woods 1 in 
October 1903, growing on and under poplar bark. One group is 
about one inch long by a third as broad, the other is about a 
fourth as large ; another from Blue Monuds, August 8, 1904; an¬ 
other from East Madison on a dead straw found August 10, 1904. 
Physarum cinereum (Batsch.) P'ers. 
1786. Lycoperdon cinereum Batsch, Blench. Fung., p. 249, fig. 
169. 
1805. Physarum cinereum Bersoon, Synopsis, p. 170. 
Maebride: “Plasmodium watery-white or transparent, wide- 
streaming on decayed sod, etc. Sporangia sessile, closely gregar¬ 
ious or even heaped, sub-globose, elongate or plasmodiocarpous, 
more or less calcareous, gray; peridium simple, thin, more or less 
densely coated with lime; capillitium strongly developed, the 
nodes more or less richly calcareous, the lime-knots rounded, 
angular; spore-mass brown, spores violaceous-brown, 10-12/*, 
distinctly warted.” He calls it a “delicate, inconspicuous 
species, ashen gray. ’ ’ 
Lister varies somewhat from the above. He says in part: 
“Sporangia pulvinate, heaped, crowded, or scattered, cinereous, 
more or less warted or veined with white; capillitium sometimes 
