732 ADDITIONAL EXERaSES 



Psathyra. Peck: Rep. N. Y. State Mus., 64. 

 Psathyrella. Peck: Rep. N. Y. State Mus., 23: 102, 1873. 

 PsUocybe. Peck: Rep. N. Y. State Mus., 23: 99, 1873; 64. 

 Russula. Eakle: Torreya, 2: 101-3, 117-19, July, August, 1902. 



Peck: Rep. N. Y. State Mus., 23: 120, 1873; 60. 

 Stropharia. E.-uiLE: Torreya, 3: 24, February, 1903. 

 Tricholoma. Morgan: Journ. Cin. Soc. Nat. Hist., 6: 65, 1883. 



Peck: Rep. N. Y. State Mus., 23: 73, 1873; 44: 39, 40, 44> 52, S^i 61, 1891; 

 48: 266, 1895. 

 Volvaria. Lloyd: Volvae of U. S., 10, 1898. McIlvaine: One Thousand American 

 Fungi, 239, 1900. 



APPENDIX XI 



Key to AGARiCACE.a: 



The following key to the Agakicace^ is taken from Bulletin No. 175, U. S 

 Department of Agriculture, 1915, entitled "Mushrooms and other Common Fungi" 

 by Flora W. Patterson and Vera K. Charles, as well as the descriptions of a few 

 of the more common forms selected by way of illustration. 



The classification of the genera of Agaricaceae is based upon the color of the 

 spores. It is generally a comparatively easy matter to form an opinion regarding 

 the color of the spores, but if any diflSculty is experienced a spore print may be 

 made. The process is very simple, and the results are quite satisfactory. The 

 stem is removed from the specimen from which a print is desired and the cap 

 placed face down on pieces of black and white paper placed side by side and 

 covered with a tumbler. When the spores are mature they will fall in radiating 

 lines on the pieces of paper. If a permanent spore print is desired, an alcoholic 

 spray of white shellac may be employed. This is prepared by making a saturated 

 solution of white shellac and then diluting it 50 per cent, with alcohol. 



WhiU-spored Agarics 



Plants soft or more or less fleshy, soon decaying, not reviving 

 well when moistened: 

 Ring or volva or both present — 



Volva and ring both present Amanita. 



Volva present, ring absent Amanitopsis. 



Volva absent, ring present — 



Gills free from stem Lepiota. 



Gills attached to the stem Armillaria. 



Ring and volva both absent — 



Stem excentric or lateral Pletjrotus. 



Stem central — 

 Gills decurrent — 



Edge blunt, fold-like, forked Cantharellus. 



Edge thin, stem fibrous outside Cutocybe. 



