152 MUSHROOMS. 



23. Margin of pileu3 incurved when young, Psilocybe. 

 Margin of pileus always straight, Psathyra. 



24. Pileus of normal form, 25. 



25. Pileus fleshy, membranaceous or deli- 



quescent, 26. 



26. Gills deliquescent — inky fluid, Coprinus. 

 Gills not deliquescent — ring present, Annellaria. 

 Gills not decurrent — ring wanting, 27. 



27. Pileus striate — plants small, Psathyrella. 

 Pileus not striate, stem fleshy, margin 



exceeding the gills, Panaeolus. 



Class II. Key to Pore-beaeinq Fungi (Polyporei). 



1. Pores readily separating from cap, spores 



whitish or brownish. Boletus. 



2. Stems strictly lateral, pores in the form 



of tubes, mouths are separate from 



each other (growing on wood), Fistulina. 



3. Tubes not separable from each other, 



round, angular, or torn, fleshy, 



leathery or woody, Polyporus. 



(Key to species of Boleti may be found in Professor Peck's 

 work on Boleti.) 



Class III. Key to Spine-beaeikg Fungi {Bydnei). 



1. Spines awl-shaped, distinct at base, Hydnum. 



Spines awl-shaped, equal; plant gelat- 

 inous, tremulous, Tremellodon. 



Class IV. Key to Smooth Surface Fungi {Thehphora). 



1. Spores white, on ground, fleshy, tubi- 



form, cap blackish, scaly, stem 



hollow, Craterellua cornucopioides. 



2. Coriaceous or woody, somewhat zoned, 



entire, definite in form, Stereum. 



