Bean—The Myxomycetes of Wisconsin. 
1277 
matter, and more or less closely combined with the membranous, 
smooth inner layer. He calls the spores minutely warted, 8-12/a 
in diameter. 
Massee calls the capillitium threads smooth, rarely notched or 
furnished with rudimentary scattered spinules; spores minutely 
warted, 9-12 /a in diameter. 
In my material the capillitium is not very abundant, varying 
in width, with irregular projections, branched; spores minutely 
warted, 9-12/a in diameter. 
My one group of sporangia I found on a piece of oak bark in 
the campus woods in October, 1903. 
Perachaena corticalis (Batsch) Rost. 
1783. Lycoperdon corticale Batsch. Eleuch, Fung., p. 155. 
1875. PericJiaena corticalis (Batsch) Rost., Mon., p. 293. 
Saecardo: “Peridia gregarious, sessile, resting upon a hypo- 
thallus, spheroidal, depressed, dehiscence circumscissile; from 
dirty yellow to obscure red; capillitium scantily developed, 
threads S-25/a thick; spores smooth, light yellow, 10-12 /a.” 
Macbride calls the upper part or lid chestnut brown, the lower 
almost black; capillitium smooth, attached to the lid and usually 
coming away with it.On and under the bark of dead elms 
of various species.Prior to maturity the future line of 
fission is plainly indicated by the difference in color. In another 
place he says the capillitium is nearly smooth; spores only 
slightly roughened by minute warts. 
Lister says the sporangia sometimes form short, broad plas- 
modiocarps; that they are crowded, sessile on a broad or narrow 
base, rarely substipitate. He calls the color dark purple or 
purplish-brown, nut-brown, gray, or white. “Dehiscing along 
definite lines, either horizontally with a convex lid, or in broad 
sinuous lobes.’’ He calls the capillitium threads irregularly 
compressed, angled and constricted, minutely warted, rarely 
smooth. Size of the spores, 12-14/* in diameter. 
Massee describes the color as brown, bluish-purple, sometimes 
whitish; capillitium sometimes almost obsolete, threads thin, 
smooth, or here and there notched; spores warted, warts variable 
in size, sometimes very indistinct, at others well developed, never 
smooth. 9-12/a in diameter. The spores vary in marking from 
vague granulations to well-defined warts. 
