732 ADDITIONAL EXERCISES 



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

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

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

 Russula. Earle: Torreya, 2: 101-3, 11 7-19, July, August, 1902. 



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

 Stropharia. Earle: 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, 56, 61, 1891; 

 48: 266, 1895. 

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

 Fungi, 239, 1900. 



APPENDIX XI 



Key to Agaricace^ 



The following key to the Agaricace^ 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 difficulty 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. 



Whites pored 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 !* Pleurotus. 



Stem central- 

 Gills decurrent — 



Edge blunt, fold-like, forked Cantharellus. 



Edge thin, stem fibrous outside Clitocybe. 



