472 Wisconsin Academy of Sciences, Arts, and Letters. 
urements as it is difficult to fix the limits. There are few species 
in which very large and very small individuals do not occur. 
The plants have been collected and photographed at different 
places in Michigan, Wisconsin and Illinois during the past four 
years. The district is quite rich in these plants and there is no 
reason why many of the species listed in the notes may not also 
be discovered here as well as a number of others that occur in 
Europe. 
Synopsis of the Species. 
A. Growing on the ground (Terrigenae). \ 
1. Large plants with a thick persistent annulus. Type of 
Pholiota caperata. 
Pholiota caperata (Pers.) p. 476, pi. XXIV. 
Pholiota.p. 476, pi. XXV. 
Related species: Pholiota johnsoniana, Pk. 
2. Large plants with a membranous annulus. 
Pholiota howeana, Pk. p. 477, pi. XXVI. 
Related species: Pholiota ventricosa, Earle. 
3. Medium sized plants with a membranous annulus. Type 
of Pholiota praecox and Pholiota dura. 
Pholiota praecox (Pers.) p. 478, pis. XXVII and XXVIII, 
A, B. 
Pholiota vermiflua, Pk. p. 478, pi. XXVIII, C-E. 
Pholiota temnophylla, Pk. p. 479, pi. XXXIII, A. 
Pholiota dura, Bolt. p. 480, pi. XXIX. 
Related species: Pholiota mollicula, Bann. and Pk., Pholiota du- 
voides, Pk. 
4. Medium sized plants with a membranous annulus and vis¬ 
cid pileus. Type of Pholiota erebia. 
Pholiota erebia, Fr. p. 481, pi. XXX. 
Pholiota ombrophila, Fr. p. 482, pi. XXXI. 
Related species: Pholiota aggericola, Pk. and Pholiota aggericola 
var. retirugis, Pk. 
