406 Wisconsin Academy of Sciences , Arts, and Letters. 
SYNOPSIS OF THE FORMS ILLUSTRATED 
Stem as well as the pileus viscid. Yellowish. Pileus convex 
or hemispherical, obtuse. 
Stem stuffed.S. stercoraria, vol. XVII, pi. LXVII. 
Stem hollow.S. semiglobata, pi. XVIII. 
Sterile form of S. semiglobata.PI. XVIII K. 
Pileus umbonate. 
.S. umbonatescens, vol. XVII, pi. LXV B. 
Stem dry. Plants argillaceous. 
Without a root. 
.S. siccipes, vol. XVII, pi. LXVI DEF. 
With a root. 
.S. siccipes v. radicata, pi. XVIII I. 
Stropharia semiglobata and Stropharia stercoraria are 
both included in the important European lists and the char¬ 
acters ascribed to them are the same there as here. Semi¬ 
globata has been illustrated twenty times and Stercoraria 
seven times, so that semiglobata appears to be the best 
known species in Europe as well as in America. Stropharia 
umbonatescens corresponds to Stropharia mammillata Kalch. 
and Stropharia siccipes is a European species so that the 
variation in the group in Europe corresponds closely to that 
in the United States. 
STRUCTURE OF THE PLANTS IN THE GROUP 
The photographs in pi. XVIII show the structure of the 
plants in the group. 
a. The white floccose universal veil which covered the 
young plants can be seen on the stems in D and E. It disap¬ 
pears earlier from the pileus than from the stem and both 
pileus and stem are covered with a smooth viscid coat when 
mature. 
b. The young lamellae are nearly orbicular, G. The 
partial veil fills the triangular space between the gills and 
the stem and extends up to the base of the gills at the junc¬ 
tion of the pileus and the stem. It appears white in G in 
contrast with the gills and the growing tissue of the stem. 
The expansion of the pileus and elongation of the stem tears 
the under surface of the partial veil from the stem below and 
