1276 Wisconsin Academy of Sciences, Arts and Letters. 
minutely verrueulose, in addition to the numerous spines, which 
he finds to be 2 to 4y long. The diameter of the spores he gives 
as 1 0 to 14 fi. 
Lister puts the species into the genus Perichaena, and names 
it P. chrysosperma. His description leaves no doubt that it is the 
same species described by Macbride as above. He says, however, 
that the sporangium wall is of two layers, the outer composed of 
brown granular matter, which either forms a complete crust or 
is more or less obsolete; the inner layer is subcartiiaginous, yel¬ 
lowish-olive, translucent. Stalk, when present, stout, black. 
My one specimen consists of eight sporanges, one of which is a 
thick ring, another about two-thirds of a ring, one dumb-bell 
shaped, and two nearly spherical; the other three are too much 
broken for their shape to be distinguished. 
They have a thin, dull, dark membrane on the outside, broken 
away in places, showing a shining yellow inner membrane; capil- 
litium irregular, branched, 3-5^ thick, with scattered, slender, 
bent, curved, or twisted spines, 3-5/x long; free ends few, clavate, 
spineseent; spores yellow, warted, 9-12^. The long spines on the 
threads are very distinctive. 
T found this species on the bark of a knot of a small dead oak 
twig which had a few hours before been blown from a tree to a 
walk on the university campus. The sporangia must have 
formed while the twig was still high above the ground—an un¬ 
usual position for a myxomycete. 
Perichaena depressa Libert. 
1837. Perichaena depressa Libert, FI., Crypt. Ard., IV., No. 378. 
Saccardo: “Peridia very much depressed, gregarious, crowded, 
polygonal, united laterally, red to chestnut-brown, shining, top 
coming off like a lid; capillitium well developed, threads of vari¬ 
ous forms and thicknesses 8 to 33^; spores globose, smooth, 9- 
IV” 
Macbride says the capillitium is of slender yellow threads of 
various widths, almost smooth; spores minutely warted, 10-12/x 
in diameter; shallow spore-cases in which lie the yellow spores 
and scanty capillitium. 
Lister speaks of this species as having a sporangium-wall of 
two layers, the outer cartilaginous, charged with brown granular 
