60 NEW YORK STATE MUSEUM 



Series B 



Plant truly hygrophanous 



Pileus thin, depressed or cup shape, lamellae adnate be- 

 coming decurrent Cyathi formes 



Pileus thin, convex flattened or depressed, glabrous, 

 lamellae thin, close, horizontal, adnate or decurrent 

 with a tooth Orbiformes 



Section Versiformes differs from Orbiformes chiefly in having 

 the pileus not glabrous. It is largely composed of species which 

 w e have placed in the genus Laccaria. Other New York representa- 

 tives are wanting. 



SERIES A 



Xot truly hygrophanous 



Disciformes 



Pileus subequally fleshy, convex, plane or depressed; lamellae at 

 first adnate or regularly adnato-decurrent. 



Solitary or gregarious, commonly terrestrial, rarely lignicolous. 

 This section includes many species of very diverse size, habitat and 

 appearance and they are not always sharply limited from each other. 

 The pileus, in some of the more fleshy species, assumes a broadly 

 obconic shape when mature. The pileus is dry in some, moist, but 

 not truly hygrophanous, in others. The species have been assembled 

 in groups depending on the color of the pileus. 



KEY TO THE SPECIES 



Pileus some shade of brown or cinereous i 



Pileus reddish or tan color 3 



Pileus some shade of yellow .4 



Pileus green or greenish odora 



Pileus grayish or whitish 8 



Pileus white or watery white when moist 12 



1 Stem tapering upward 2 



1 Stem not tapering upward media 



2 Lamellae crowded nebularis 



2 Lamellae not crowded clavipes 



3 Taste and odor farinaceous, pileus even pinophila 



3 Taste and odor not farinaceous, pileus rivulose rivulosa 



4 Growing on decaying wood 5 



4 Growing on the ground 6 



5 Pileus minutely squamulose decora 



5 Pileus glabrous sulphurea 



6 Young pileus hairy or tomentose suhhirta 



6 Vomit; pileus glabrous 7 



7 Taste hitter, stem stuffed fellea 



