Bean—The Myxomycetes of Wisconsin. 1255 
tervals from the columella, at first almost simple, suddenly- 
branching to form a smooth superficial net with rounded vari¬ 
ously shaped meshes. Spores pale reddish-purple, nearly smooth 
or minutely and closely w r arted, 7-9/x in diameter. The spores 
are remarkably constant in color and size, and in the minute, 
evenly distributed warts. The capillitium exhibits wide differ¬ 
ences. 
Massee finds the stem much shorter than the sporangium, black, 
shining. He thinks the spores smooth, and 6-7^ in diameter. 
The variations within the same species of Stemonitis make 
specimens of this genus extremely difficult to determine. I find 
the sporangia about 18 mm. tall; there is almost no inner net, the 
main branches from the columella scarcely branching again until 
they reach the surface. The spores are minutely warted and 8/x 
in diameter. 
One group of sporangia which we have was obtained near 
Webster, growing on rotten wood, in the summer of 1894. A 
small group grew on the soil in the greenhouse in January 1913, 
Stemonitis Webberi Rex. 
1891. Stemonitis Webberi Rex. Proe. Phil. Acad., p. 390. 
Macbride: ‘ 4 Sporangia clustered, usually in small tufts, rusty 
brown in color, 8-10 mm., including the stipe, which is jet black, 
shining, and much expanded at the base; hvpothallus continuous, 
well-developed, a thin transparent pellicle; columella black, 
tapering upward, giving off at intervals the capillitial branches, 
and becoming dissipated just below the obtuse apex; inner capil¬ 
litial network very open, the branches far apart, anastomosing 
but a few times before breaking into the surface net to form 
large, irregular meshes, 50-125^: spores minutely roughened, 
fuscous, 8-9u„” 
Lister makes this a variety of S. splendens Rost., which is his 
synonym for S. Morgani. He gives no determinative character¬ 
istics. 
Massee does not have the name S. Webberi in his list. 
As is often the case among specimens of Stemonitis , this is 
difficult to determine. The sporangia are about 10 mm.; the 
inner net is very loose, the outer net coarse, irregular, the 
