116 
Journal of the Mitcheee Society 
[ December 
ated, but its remains will usually be seen on the pileus or at the 
base of the stipe, according to the nature of its development. In 
some cases the valva is a loose membranous sack, which splits as 
the pileus develops, and is left as a loose cup at the base of the 
stipe. In other cases the volva breaks at the margin of the pileus 
leaving a part adherent to the pileus in the form of irregularwarts, 
while the basal portion remains adherent to the base of the stipe, 
either in the form of a sheath with an even margin where it has 
been ruptured, or in the form of scales. 
Species, then, with white spores, a distinct cup at the base of 
the stipe, or the pileus adorned with superficial warts may be 
looked for in this genus. The Volvarias wich are rather rare have 
the same loose cup at the base of the stipe, but will be at once 
distinguished by the red spore print which will be obtained by 
placing a cap on white paper, 
KEY TO THE GENERA AND SPECIES 
Stipe furnished with an annulus. 
Stipe without an annulus. 
Amanita. 
Volva forming a loose membranous cup at the base of the stipe 
Volva forming a distinct marginate sheath adnate to the stipe 
Volva not as above. 
Amanita. 
Amanitopsis. 
1. Gills yellow. A. caesarea. 
1. Gills white, margin of pileus striate. A. spreta. 
1. Gills white, margin ef pileus even. 2. 
2. Annulus remaining white. A. phalloides. 
2. Annulus becoming sooty black. A. porphyria. 
3. Pileus yellow. A. mappa. 
3. Pileus white. A. cothumata. 
3. Pileus gray or brownish gray. A. pantherina. 
4 . Pileus striate on the margin , spores elliptical . A . muscaria and 
A. russuloides. 
4. Pileus striate on the margin, spores subglobose. A. frostiana. 
5. Flesh with red stains when wounded. A. rubescens. 
5. Not as above. 6. 
6. Pileus adorned with erect pointed warts. A. echinocephala. 
