1919] Ckatekellus_, Canthaeell,us and Related Genera 27 



1. Gills not as above; veil absent Plicaturella 



1. Gills not as above ; veil present 2 



2. Veil composed of cob-web hairs (arachnoid), often invisible in 



age Cortinarius 



2. Veil not cobwebby 3 



3. Stem eccentric or none Crepidotus 



3. Stem central 4 



4. Stem with a ring PhoUota 



4. Stem without a ring 5 



5. Gills dissolving into a jelly or powder Bolbitius 



5. Gills not as above 6 



6. Gills free from the stem Pluteolus 



6. Gills attached to the stem (adnate or adnexed) 7 



7. Stem fleshy 8 



7. Stem cartilaginous 10 



8. Gills usually notched at the stem (sinuate) 9 



8. Gills squarely attached (adnate) or decurrent Flammula 



9. Cap scaly or fibrous or silky* Inocybe 



9. Cap smooth, viscid Hebeloma 



10. Gills decurrent Tuleoria 



[not represented] 



10. Gills not decurrent 11 



11. Cap margin inrolled when young at least Naucoria 



11. Cap margin straight even when young Galerula 



D. Spores dark-brown or brown with a tint of purple or deep smoky pur- 



ple (nearly black) ; usually umber-brown (sepia) or purple-brown 

 in purplish chestnut. 

 1. Stem easily separating from the cap; ring present .Agaricus 



1. Stem not easily separating from the cap 2 



2. Veil present; ring present or wanting 3 



2. Veil wanting 4 



3. Stem with a distinct ring Stropharia 



3. Stem usually without a ring; the veil hanging in tatters from the 



cap margin or disappearing early. (In H. lachrymabundum a ring 

 is often present) HyphoJoma 



4. Stem toughish-cartilaginous, hollow; margin of cap incurved when 



young Psilocybe 



4. Stem as above or more fragile, hollow; margin of cap straight when 

 young Psathrya 



E. Spores black or nearly so. not purplish (deep smoky olive in Gomphi- 



(lius vinicoUi; and in a few species of Corprinus they are deep brown, 

 as in Agarictis, when fresh and moist, but turn almost black on 

 drying). 



*In a few species of Inocybe that nro nearly smootli. sikOi ns /. faJlnr. tin- warty 8|>orcs 

 will distinguish them from Hebeloma. 



