Bean—The Myxomycetes of Wisconsin . 
1283 
Arcyria cinerea (Bull.) Pers. 
1791. Trichia cinerea Bull., Champ, d& France, p. 120, Tab. 477. 
1801. Arcyria cinerea (Bull.) Pers. Syn. Fung., p. 184. 
Macbride: ‘ 4 Sporangia scattered or gregarious, ovoid or cylin¬ 
drical, generally tapering upward, about 2-3 mm. high, ashen 
gray, sometimes with a yellowish tinge, stipitate; calyculus 
very small, thin; stipe about half the total height, rising from a 
small hypothallus, thin, gray or blackish, densely crowded with 
spore-like cells; capillitium dense, freely branching, ashen or yel¬ 
lowish, little expanded in dehiscence, the threads almost even, 
though a little wider below, minutely spinulose; spore-mass con- 
eolorous, spores by transmitted light colorless, smooth, 6-7ju. A 
very common little species easily recognized by its color and 
habit. The capillitium is more dense than in any other species 
and expands less. The stipe is about equal to the expanded cap¬ 
illitium, unusually long.” 
Lister’s description agrees with Macbride’s. 
Massee says that the sporangia are simple or digitato-fascicu- 
late on a common stem; that the capillitium is dense, protruding 
elastically, and remaining erect. The rest of his description 
agrees with Macbride’s. 
My specimen agrees with Macbride’s description excepting as 
to spores, which I find to be from 7 to 9/x in diameter. The 
sporanges are tiny bodies, under a hand lens showing beautiful 
dense pear-shaped masses of soft gray capillitium with a yellow¬ 
ish tinge, which keep their shape and ereetness under many ad¬ 
verse conditions. 
The one small group of this species which I have was found at 
Blue Mounds, August 8, 1903. The sporangia were growing on 
wood so much weather-wopm that it fell into fragments. 
Arcyria magna Rex, 
1893. Arcyria magna Rex, Proc. Phil. Acad., p. 364. 
Macbride (in part) : “Sporangia tawny gray or ashen, cylin- 
dric, when expanded reaching a length of half a centimeter or 
more, stipitate; petridium evanescent except the small, shallow, 
cup-like base; stipe long, weak, pale brown or reddish; capilli- 
