March 1907] North American Species of Agaricaceae 53 



NORTH AMERICAN SPECIES OF AGARICACEAE. 



a. p. morgan. 



The Melanosporae. 



Synopsis of the Genera. 



X. Spores Black. 



I. PSATHYRELLA. Pileus membranaceous, conic or 

 campanulate, striatulate. 



II. PANAEOLUS. Pileus somewhat fleshy, without striae. 

 XX. Spores Purplish-Brown or Purplish-Black. 



A. Veil none. 



a. Lamellae iiery broad, subdecurrent. 



III. DECONICA. Pileus somewhat fleshy, hemispheric. 



b. Lamellae adnexed or adnate. 



IV. PSATHYRA. Pileus submembranaceous, conic or cam- 



panulate ; stipe fragile. 



V. PSILOCYBE. Pileus more or less fleshy; stipe rigid or 

 tough. 



c. Lamellae free from the stipe. 



VI. PILOSACE. Pileus fleshy, convex then expanded. 



B. Veil present. 



a. Lamellae attached to the stipe. 



VII. HYPHOLMA. Veil marginal, woven into a wxb which 

 adheres to the margin of the pileus. 



VIII. STROPIL\RIA. Veil marginal; when the pileus ex- 

 pands it is left behind as an annulus upon the 

 stipe. 



b. Lamellae free from the stipe. 



IX. AGARICUS. Veil marginal, annulate upon the stipe. 



X. CLARKEINDA. Veil universal, a volva inclosing the 

 incipient pileus and stipe. 



