1284 Wisconsin Academy of Sciences, Arts and Letters. 
tium gray or drab-colored, tbe threads regular, cylindric, coarsely 
sculptured with rings, half-rings, cogs, spines, etc.; spores in 
mass dull gray, drab, under the lens colorless, papillate, with 
few papillae, 7—8/x. ’ ’ 
Lister does not recognize this as a separate species, but calls it 
a form of A. Oerstedtii , which is pale red in all its parts. He 
says this form has smoother calyculi and stouter markings on 
the threads. 
Massee has no description which agrees with that quoted above, 
and the name is not included in his list of synonyms. 
My specimens agree with Macbride’s description, except that 
the stipe is variable in length, and the hypothallus is quite evi¬ 
dent, thin and glassy. I find the spores as described, and ,7-8/* 
in diameter. 
This is a beautiful species, very different in color from A. nut¬ 
ans. and from A. cinerea , which it most nearly resembles in gen¬ 
eral appearance. 
We have one collection which was found growing on a maple 
tree be«ide a street in Madison, July 3, 1905. 
Hemitrichia serpula (Scop.) Rost. 
1722. Mucor serpula Scop., FI. Cam., IT., p. 493. 
1873. Hemitrichia serpula (Scop.) Rost., Yersuch, p. 14. 
Saceardo: “Peridia spreading, vein-like, with many abruptly 
reticulated branchings; capillitium 4/*, branches numerous, free 
ends, the ends equal to the diameter of the capillitium, or some¬ 
what longer; spiral bands 3-4, smooth, armed with numerous 
long spines, spaces between 3 or 4 times the width of the bands; 
spores yellow 9-11/*. ” 
Macbride says in part: “Fructification plasmodiocarpus, often 
covering several square centimeters in extent, terete, :rusty, taw¬ 
ny or bright yellow; the peridium thin, transparent, with ir¬ 
regular dehiscence ; hypothallus none ; capillitium variable, spar¬ 
ingly branched, free everywhere, the free tips spinose, acumi¬ 
nate. ...... .traces of longitudinal striae; spore-mass golden yel¬ 
low, spores globose, delicately reticulate, about 10/* in diameter.” 
Lister says the sporangium-wall is of two layers; capillitium 
threads are 5 to thick; spores 10 to 12/* in diameter, their bor¬ 
der being from 0.5 to lu wide. 
