1917] HOTSON—BULBIFEROUS FUNGI 267 
According to his account, the bulbils resemble the compound 
spores of Urocystis among the Ustilaginales. The color of these 
Urocystis-like spores is reddish to chocolate brown, their form more 
or less spherical, the cortex being a layer of empty, colorless cells. 
The size of the spore balls, however, is not given. They apparently 
resemble the bulbils of Melanospora papillata Hotson, but the 
perithecia of the two species are different. In M. marchica the 
perithecium has no papilla, the setae arising from the flush surface 
of the wall. The perithecium of M. papillata, on the other hand, 
has a distinct and often quite prominent papilla, the terminal setae 
being produced at its tip. The bulbils of M. marchica also resemble 
those of Papulospora coprophila (Zukal) Hotson, but vary some- 
what in their mode of development. Apparently NEcER had not 
seen the writer’s article dealing with bulbils (6) or that of BAINIER 
(x), and therefore makes no comparisons. 
Recently DopcE (3, 4) has reported a species of Papulospora 
closely associated with Ascobolus magnificus Dodge. He is of the 
opinion that this is either a parasite on or an asexual spore form 
of the Ascobolus. These bulbils are light brown, with a layer of __ 
empty cells forming the margin. A description of this fungus is — 
0 in the present article under the name of Papulospora mag-— 
fe has been shown in a recent article by Mexavs, RoseNpaum, 6 
and ScHuttz (8) that a spec ing bulbilsis 
' frequently associated with the powdery sc > of potatoes (Spongo- iS 
Spora subterranea [Wallr.| Johnson). These investigators have 
isolated P. coprophila (Zukal) Hotson from tubers infected with ee 
— This organism has been shov F 
experiments to be a anes arse a 
