NATURAL HISTORY SURVEY 19 



DESCRIPTION OF GENERA AND SPECIES 



HYMENOMYCETES. 



KEY TO CHICAGO FAMILIES AND GENERA. 



Hymenium not an even surface, but 



on radiating lamellae, these 



usually inferior in position. . Fam. I. AGARIC ACE AE 

 lining the interior of tubes or 



pores Fam. II. POLYPORACEAE 



covering needle-shaped or 



other fleshy protuberances. . Fam. III. HYDNACEAE 

 Hymenium even, and 



inferior, plant tough Fam. IV. THELEPHORACEAE 



on all sides of the upper parts 

 of erect fleshy clubs or dense 



branches, plant tender Fam. V. CLAVARIACEAE 



on the outer surface of a ge- 

 latinous mass Fam. VI. TREMELLACEAE 



FAM. I. AGARICACEAE. 

 Spores white or whitish (in a few cases slightly tinted) . . 1 



Spores rosy, rusty pink, or salmon color... 13 



Spores ochraceous or subferruginous 19 



Spores black, dark brown, or purplish-brown 25 



1 Pileus more or less fleshy, putrescent 2 



Pileus fleshy-tough, or even corky, not putrescent, reviving 



with moisture 11 



2 Stem fleshy, separating easily from the pileus 3 



Stem fleshy or fibrous-elastic, confluent with 



and of the same structure as the pileus 4 



Stem cartilaginous, confluent with the pileus, 



but of a different structure 7 



3 With volva and annulus Amanita. 



With volva, annulus wanting Amanitopsis. 



Without volva, annulus present Lepiota. 



4 Without volva or annulus 5 



Without volva, with annulus, lamellae at- 

 tached to the stem Armillaria. 



5 Lamellae sinuate Tricholoma. 



Lamellae decurrent 6 



6 Edge of lamellae acute Clitocybe. 



Lamellae often branched, edge obtuse Cantharellus. 



7 Lamellae adnate, margin of pileus at first 



involute Collybia. 



Lamellae sinuate, margin of pileus at first 



straight Mycena. 



Lamellae decurrent, pileus usually umbilicate.Omphalia. 



