6 BULLETIN 175, U. S. DEPARTMENT OF AGRICULTURE. 



Plants soft or more or less fleshy, etc. — Continued. 

 Ring and volva both absent — Continued. 

 Stem central — Continued. 



Gills adnate or adnexed — Continued. 



Cap thin, margin of the cap at first straight, mostly 



bell shaped Mycena. 



Cap fleshy, gills very rigid and brittle, stem stout — 



Milk present Lactarius. 



Milk absent Russula. 



Gills various, often decurrent, adnate or only adnexed, 

 edge thin, thick at junction of cap, usually distant, 



waxy Hygrophorus. 



Plants coriaceous, tough, fleshy or membranaceous, reviving when 

 moistened: 

 Stem generally central, substance of the cap noncontinuous with 



that of the stem, gills thin, often connected by veins or ridges. .Marasmius. 

 Stem central, excentric, lateral, or absent, substance of the cap 

 continuous with that of the stem — 



Edge of gills toothed or serrate Lentinus. 



Edge of gills not toothed or serrate Panus. 



Edge of gills split into two laminae and revolute Schizophyllum. 



Plants corky or woody, gills radiating Lenzites. 



ROSY-SPORED AGARICS. 



Stem excentric or absent and pileus lateral Claudopus. 



Stem central: 



Volva present, annulus wanting Volvaria. 



Volva and annulus absent- 

 Cap easily separating from the stem, gills free Pluteus. 



Cap confluent with the stem, gills sinuate Entoloma. 



OCHER-SPORED AGARICS (SPORES YELLOW OR BROWN). 



Gills easily separable from the flesh of the cap: 



Margin of the cap incurved, gills more or less decurrent forked 



or connected with veinlike reticulations Paxillus. 



Gills not easily separable from the flesh of the cap: 



Universal veil present, arachnoid Cortinarius. 



Universal veil absent — 



Ring present Pholiota. 



Ring absent — 



Stem central — 



Cap turned in Naucoria. 



Cap not turned in Galera. 



Stem excentric or none Crepidotus. 



BROWN-SPORED AGARICS. 



Cap easily separating from the stem, gills usually free Agaricus. 



Cap not easily separating from the stem, gills attached: 



Ring present Stropharia. 



Ring absent, veil remaining attached to the margin of the cap. .Hypholoma. 



BLACK-SPORED AGARICS. 



Gills deliquescing, cap thin, ring present in some species Coprinus. 



Gills not deliquescing: 



Margin of cap striate, gills not variegated Psathyrella. 



Margin of cap not striate, gills variegated Panaeolus. 



