1278 Wisconsin Academy of Sciences, Arts and Letters. 
My material shows sporangia that are gregarious, sessile or 
substipitate, globose, ellipsoidal, sometimes umbilicate below, or 
forming short plasmodiocarps, but none are flattened; dehiscence 
eircumscissile by a convex lid with sinuous lobes, as Listen states; 
the color medium or dark brown, sometimes with a purplish 
tinge; sometimes but not always showing in lighter color the 
line of dehiscence; there are no such differences of color between 
the cap and cup in my specimens as Macbride mentions; thin, 
shining, extended hypothallus. Macbride states that the capil- 
litium is smooth, then he says nearly smooth, yet in his figures 
the capillitium is represented as angled, notched, and with pro¬ 
jections. I find the capillitium scanty or almost wsanting, 
branched, unequal, yet none as wide as Saccardo gives, never 
smooth, but angled, constricted, with projections, but no minute 
warts; capillitium and spore-mass yellow; spores minutely 
wanted, 10-12y. 
I obtained this species in large quantities, October 19, 1903, 
from all parts of the bark of a poplar log in the Elmside woods. 
I found none on the wood itself. April 29, 1904, the log had 
been removed, but a few rods away was a piece of poplar bark 
bearing several groups of the species, of the last year’s fruit. 
With these was a group nearly white, wrinkled and shriveled: 
these put into a wmrrn moist-chamber became plump and came to 
maturity. I think that they had started to grow one unusually 
■warm April day and that the succeeding cold had arrested their 
development. 
Some pieces of the bark brought into the herbarium room in 
October and in April, put under a bell-jar on a tin plate and kept 
moist, fruited plentifully, giving me material for the study of 
their life-history. The plasmodium appears on the surface only 
as tiny milky wdiite drops which are the beginnings of the sporan¬ 
gia. The time from the first appearance of the plasmodium to 
that of the fully ripe spores does not ordinarily exceed thirty- 
six hours. 
Somewhat later in the spring of 1904, several logs which had 
been brought into the Science Hall greenhouse bore large crops of 
several kinds of myxomycetes, among them a large quantity of 
Perichaena corticalis, which I used for further study of its life- 
history. 
These logs came from the university campus near the buildings, 
but I have never found this species growing in those woods. 
