Harper—Additional Species of Pholiota. 405 
The chief distinction is always that of the bulbous and non- 
bulbous stem. In Constantin and Dufour forms of both species 
with scaly stems are reported. 
THE STROPHARIA STERCORARIA-SEMIGLOBATA GROUP 
1. Stropharia semiglobata. Batsch. Typical form, 
PI. XVIII. 
Plants of this species are common on dung in pastures at 
Geneseo, Ills. It is more frequently met with than any other 
form in the group. It was described but not illustrated in the 
article on Species of Stropharia in the Region of the Great 
Lakes, vol. XVII of these Transactions, p. 1022. 
The characteristic marks of the species are the smooth, 
viscid, cream colored, hemispherical pileus, the broad, 
squarely adnate gills, the long, smooth, hollow stem and the 
scanty annulus in the mature plants. Its ally Stropharia 
stercoraria may be distinguished by the more flattened 
pileus, more floccose stuffed stem, narrower gills and more 
persistent annulus. 
2. Stropharia semiglobata. Sterile form. PI. XVIII K. 
Sterile plants of this species were found several times dur¬ 
ing the summer of 1915 on dung heaps in a pasture at 
Geneseo, Ills. They agreed with the normal plants in all 
respects except that the gills remained white and bore no 
spores. There were numerous fertile plants in the neigh¬ 
borhood. A number of sterile forms of different species have 
been reported. Clitocybe sadleri B. and Br. is supposed to 
be a sterile form of Hypholoma fasciculare. 
3. Stropharia siccipes Karst. Var. radicata Pk. PI. 
XVIII I. 
Specimens of the rooting form of Stropharia siccipes were 
sent to me by Dr. Mary Whetstone in June, 1915. They 
grew in rich ground and had conspicuous roots some of them 
nearly horizontal. A photograph of a dried specimen of 
these plants is shown in pi. XVIII I. Peck suggested that 
the plants grew from manure buried in the ground. It is 
possible that the root is a sclerotium and survives the winter. 
The illustration shows the appearance of the pileus of dried 
plants in this group. The cortex is smooth and shining and 
becomes areolately wrinkled. 
