1232 Wisconsin Academy of Sciences, Arts and Letters. 
on green moss and dead wood, another at Blue Mounds, July 
1907, on green grass stems. 
Physaxmn melleum (Berk, and Br.) Mass. 
1873. Dydymium melleum , Berk. & Br., Jour. Linn. Soc. XIV 
p. 83. 
1892. Physarum melleum Massee, Mon., p. 278. 
Macbride: “Sporangia scattered, stipitate, globose, flattened 
below, clear yellow or honey-colored; stipe short, about equaling 
the sporangium, pure white, somewhat wrinkled; columella small 
but distinct, white: hypethallus none; capillitium abundant, 
open, snow-white, with rather large angularly stellate nodes; 
spore-mass brown, almost black; spores by transmitted light pale 
violet or lilac-tinted, almost smooth, 7.5-10/a: Easily distin¬ 
guished by its white stipe, columella and capillitium in strong 
contrast with yellow peridial walls. 
Lister describes the plasmodium as yellow; sporangia yellow or 
brownish-yellow; sporangium-wall membranous, often wrinkled, 
persistent at the ; base, yellowish, with minute yellow lime gran¬ 
ules sparsely distributed; stalk white, buff, or rufous, stout, 
opaque, with few shallow furrows; capillitium consisting of ir¬ 
regularly branching delicate hyaline threads sometimes expanded 
at the axils, with lime-knots white or yellowish, various in shape 
and size, mostly large and angled. Spores 7-8y in diameter. 
Massee calls the color of this species yellowish-olive or honey- 
colored, sprinkled with minute particles of lime. He describes 
the capillitium as very dense, snow-white, the nodes numerous, 
very large, angularly stellate, separated from each other by con¬ 
strictions only, lime in the form of granules present in every 
portion; spores minutely verruculose, 6-7/x in diameter. In other 
particulars his description does not differ from those above given,. 
This species is a dull brownish-yellow—honey-color describes 
it well; it is not the vivid yellow of P. auriscalpium, and it has a 
white stipe, whereas that of P. auriscalpium is dark. In P. mel¬ 
leum the stipes often remain after the sporangia disappear. The 
above descriptions render it easy to determine. 
We have one collection, gathered in the campus woods, July 
22, 1904: 
