24 THE CHICAGO ACADEMY OF SCIENCES 



Late in the season a form occurs with the pileus whitish, be- 

 coming fuliginous toward the center of the disk. The variety 

 with the pileus wholly white and volva closely sheathing the base 

 of the stem (A. verna Bull.) also occurs. 



Amanita muscaria L. 



Pileus at first red, then orange-tawny or yellowish, becoming 

 pale when old, globose then convex, at length expanded, sprinkled 

 with thick, angular fragments of the volva, margin slightly striate; 

 flesh white. 



Lamellae reaching the stem and decurrent in lines upon it, 

 crowded, broader in front, white. 



Stem shining white, firm, torn into scales, stuffed then hollow, 

 bulbous at the base which is marginate with concentric scales or 

 interrupted rings formed by the splitting volva. Ring soft, 

 torn, inserted at the apex of the stem. Spores broadly elliptical, 

 7.5 to 10 p. long. 



Pileus up to 10 cm. broad; stem 8 to 15 cm. high, 1 to 1.5 cm. 

 thick. 



Woods, throughout. Often with A. phalloides. and like it 

 very poisonous. Popularly known as the " Fly Agaric " from the 

 fact that it will kill flies that feed upon it, a property which we 

 have verified by experiment. 



Amanita Frostiana Pk. 



Pileus convex or expanded, bright orange or yellow, warty, 

 sometimes nearly or quite smooth, striate on the margin. 



Lamellae free, white or slightly tinged with yellow. 

 - Stem white or yellow, stuffed, bearing a slight, sometimes 

 evanescent annulus, bulbous at the base, the bulb slightly mar- 

 gined by the volva. Spores globose, 7.5 to 10 /^. 



Pileus 2.5 to 5 cm. broad; stem 5 to 7.5 cm. long, about 4 mm. 

 thick. 



In woods, Winfield, Lisle and Glencoe. July. Not easily 

 distinguished from small forms of A. muscaria. Separated from 

 the latter species by Prof. Peck, on account of the globose spores 

 and smaller size. 



Amanita pantherina DC. 



Pileus commonly olivaceous-umber when young, fleshy, con- 

 vex then flattened or somewhat depressed, with a viscous pellicle 

 which is at first thick and olivaceous-fuscous then thinned out, 

 almost disappearing and livid, the disk only becoming fuscous, 

 margin striate, the fragments of the volva divided into small, 

 equal, white, regularly arranged, moderately persistent warts; 

 flesh white. 



Lamellae free, reaching the stem, broader in front, shining 

 white. Ring more or less distant, adhering obliquely, white, 

 rarely superior. 



Stem at first stuffed then hollow with spider-web fibrils within, 



