1246 Wisconsin Academy of Sciences, Arts and Letters. 
Bidymrain Nigripes (Link) Fries. 
1809. Physarum nigripes Link, Obs. Biss., I., p. 27. 
1829. Bidymium nigripes (Link) Fries, Syst. Myc., III., p. 119. 
Maebride: “Sporangia gregarious, globose or hemispheric, nm- 
bilicale beneath, small, white, stipitate: the peridium smoky, cov¬ 
ered with minute calcareous crystals ; stipe slender, erect, black, 
opaque; hypothallus thallus scutate, black; columella distinct, 
globose, black or dark brown; capillitium of delicate threads, pale 
brown or colorless, with occasional brown thickenings or nodes, 
sparingly branched; spores pale, violaceous by transmitted light, 
minutely warted, 6—8 a*. ’ ’ ( \ 
Lister, under the name D. nigripes , groups D. nigripes , B. 
xantiwpus and t). eximium, For the discussion of the differences 
among these forms I would refer to Maebride and to Lister. 
Massee, under the name of D. microcarpon, gives a description 
which differs considerably from Maebride J s description of D. 
nigripes. 
Maebride’s. description is determinative and quite correct for 
my specimens. I find the spores, however, to have a diameter of 
7—11/4. 
We have this species growing on dead oak leaves from Ceme¬ 
tery woods and Eagle Heights in July 1905, and on tobacco stems 
which were being used as an insecticide in the greenhouse in 
January 1913. 
Another group came from Winnequah, July 1904, and is on a 
little oak branch. 
Diderma reticulatum (Rost.) Morgan. 
1875. Chondrioderma reticulatum Rost., Mon., p. 170. 
1894. Biderma reticulatum (Rost.) Mo.rg., Jour Cin. Soc., p. 71. 
Maebride: “Sporangia gregarious, generally rounded and 
much depressed, flat, sometimes, especially toward the margin of 
a colony, elongate, venulose or somewhat plasmodiocarpous, dull 
white, the inner peridium ashen or bluish, remote from the cal¬ 
careous crust, which is extremely fragile, easily shelling off; 
columella indistinguishable from the base of thei sporangium, 
thin, alutaceous; capillitium of short, generally colorless, deli- 
