AMANITA Pers. 



Volva splitting regularly all around, leaving a free 

 border at base of stem; cap naked, or with broad, 



membranous patches i 



Volva splitting regularly all around, closely embracing 

 the bulbous stem; cap covered with scattered, thick 



warts 6 



Volva broken up into wart-like scales; cap bearing 

 mealy patches which soon disappear, or with small, 

 hard, pointed warts; stem bulbous at first, but bulb 



soon disappearing 12 



Gills yellow; cap red or orange, striate on the 



margin A. Caesarea 



Gills white 2 



Each basidium producing two spores A. bisporigera 



Each basidium producing four spores 3 



Cap viscid 4 



Cap dry 5 



Volva closely wrapping base of stem, persistent. . .A. verna 

 Volva cup-like around base of stem, often remaining 



in the soil when plant is collected A. phalloides 



Stem bulbous; volva split in a circular manner, some- 

 what closely joined to the stem A. mappa 



Stem not bulbous ; volva free, fitting closely around 

 the stem ; upper margin thin ; lower part thick, 



giving stem a bulbous appearance A. spreta 



Cap red or yellow 7 



Cap white, or slightly tinged with yellow 9 



Cap 4 or more inches broad, covered with rough, white 

 or yellow warts; margin slightly striate. .. ..-i. miiscaria 



Cap small, i to 2 inches broad 8 



Margin of cap striate A. Frostiana 



Margin of cap not striate A. Havoconia 



Stem tapering below the bulb into a root-like pro- 

 longation 10 



