1282 
Wisconsin Academy of Sciences, Arts and Letters. 
Arcyria denudata (L) Sheld. 
1753. Clathrus denudatus Linn., Syst. Nat., p. 1179. 
1895. Arcyria denudata (Linn.) Sheld., Minn. Bot. Studies, No. 
9, p. 470. 
Macbride: ‘ ‘ Sporangia crowded or gregarious, ovoid or short 
cylindrical, tapering upward, red-brown, stipitate; peridium 
evanescent except the plicate calyculus; stipe about equal to the 
expanded capillitium, concolorous, plicate or striate, ascending 
from a small hypothallus; capillitium attached to the whole inner 
surface of the calyculus, and connate with it, hence not decidu¬ 
ous, bright red or carmine when fresh, turning brown or paleir 
with age, the threads even, about 3y, adorned with a series of 
rather distant cogs or half rings, which form around the thread 
a lengthened spiral; spore-mass red or reddish-brown, spores by 
transmitted light colorless, nearly smooth, 6-S/x. This species is 
easily distinguished from all others of similar tints by the attach¬ 
ment of the capillitium. In adornment of the threads it is like 
A. incarnata.” 
Saccardo says that the color of all parts of this species varies 
from saffron to purplish, and to brick-red. 
Lister calls the color of the sporangia crimson. He says the 
stalk is filled with spcre-like cells. He describes the capillitium 
as an elastic network of flattened or terete red threads, with 
many attachments to the cup, and usually without free ends. 
Massee calls the color Vermillion, sometimes with a brownish or 
purplish tinge, rarely yellowish-brown. He also speaks of the 
attachment of the capillitium to the sporangial wall. 
My specimens do not vary from the above quoted descriptions. 
The chief difference between this species and A. incarnata are 
the longer, more twisted, and plicate stipe, and the less expanded 
capillitium with its permanent attachment to the calyculus. The 
capillitium of my specimen from the cemetery woods is 5-6^. 
thick, while that of other specimens is about 3,u. 
One of my three specimens was found near Doherty lake in 
summer of 1893, growing on green moss and much-decayed wood; 
one very small specimen growing on wood I found in the ceme¬ 
tery woods. October 27, 1903. For the third I have not the exact 
locality or date. It is on the end of a knot of poplar, with many 
sp oranges of a Dictydium commingled with it. 
