JRNAL OF MYCOLOGY. 
Vol. ID. MANHATTAN, KANSAS, MARCH, 1887. No. 3. 
NORTH AMERICAN AGARICS.--THE SUBGENUS 
AMANITA. 
BY A. P. MORGAN. 
Amanita.— Agarics with white spores; volva contiguous from the 
first, discrete from the epidermis of the pileus; hymenophore discrete 
from the stipe. All terrestrial. Fries, Hym. Eur., p. 17. 
In these, the most highly-developed Agarics , the veil is double, con¬ 
sisting of an outer or universal veil and a partial veil. The universal 
veil is called the volva and it envelopes the whole fungus in its younger 
state, and is afterward ruptured by the growth of the stipe ; the partial 
veil at an early stage intervenes between the edges of the lamellae and 
the stipe, and in the fully grown plant it commonly forms an annulus. 
around the upper part of the stipe. In Amanita , the volva is united or 
connate only with the base of the stipe ; it is separate and distinct from 
the epidermis of the pileus, though frequently remaining upon it in the 
shape of scales and warts ; the annulus is of a delicate texture and hangs 
down from the upper part of the stipe. The lamellae are free from the 
stipe. 
ANALYTIC KEY TO THE SPECIES. 
I. Annulati. 
A. VOLVA WITH THE LIMB FREE : 
.a. Volva dehiscent at the apex, 1-4. 
b. Volva circumscissile. 5-7. 
/>'. VOLVA WHOLLY ADXATE : 
e. Pileus with the margin striate, 8-12. 
d. Pileus with the margin even, IB, 14. 
< ’. VOL V A A LL FRIA RLE : 
e. Warts of the pileus floccose, mealy, 15, 10. 
/. Warts of the pileus thick and hard, 17. 18. 
I). VOLVA WHOLLY EVANESCENT. 19. 
II. Exannulati. 
K. VOLVA WITH THE LIMB FREE : 
g. Volva dehiscent at the apex, 20, 21. 
h. Volva ruptured irregularly, 22, 23. 
F. VOLVA WHOLLY ADN ATE, 24-20. 
G. VOLVA EVANESCENT, 27. 28. 
