INTRODUCTION. 
XV 
°R gills, vary in the different genera, being persistent in such 
as Agaricus, Russula, Lentinus, etc., hut deliquescent in Coprinus, 
Rolbitius, etc. The edge of the folds is acute in Agaricus, 
Marasmius, etc., but obtuse and vein-like in Oantharellus, 
longitudinally channelled in Trogia, and splitting in Schizo- 
phyllum. In order to assist in their determination, we have 
appended, in a tabular form, the following 
KEY TO THE GENERA, AND SUBGENERA, OP AGARICINI. 
I. Spores white, or very slightly tinted. — Leuoospori. 
* Plant fleshy, more or less'firm, putrescent 
(neither deliquescent nor coriaceous), 
f Hymenophore free. 
Pilens bearing warts or patches free 
from the cuticle. 
Ring present 1. Amanita. 
Ring absent 2. Amanitopsis. 
Pileus scaly, scales concrete with 
the cuticle. 
Ring present 3. Lepiota. 
Ring absent 4. Schulzeria. 
f Hymenophore confluent. 
J Without cartilaginous bark. 
§ Stem central. 
|| With a ring 5. ArmiUaria. 
|| Ringless. 
Gills sinuate 6. Tricholoma. 
Gills Recurrent. 
Edge acute .... 7. Clitocybe. 
Edge swollen . . . . xi. Oantharellus.. 
Gills adnate. 
Parasitic on other Agarics xii. Nvctaljs. 
Not parasitic. 
Milky ix. Lactarius. 
Not milky. 
Rigid and brittle . . x. Russula. 
Waxy vii. Hygrophorus. 
§ Stem lateral or absent . ... 11. Pleurotus. 
J With cartilaginous bark. 
Gills adnate 8. Collybia. 
Gills sinuate 9. Mi/cena. 
Gills decurrent 10. Ompttalia. 
* Plant tough, coriaceous, or woody, 
t Stem central. 
Gills simple xiii. Marasmius. 
dills branched xvi. Xkbotus. 
f Stem lateral or wanting. 
Gills toothed ....... xiv. Lentinus. 
Gills not. toothed xv. Pants. 
Gills channelled longitudinally or 
crisped xvii. Trogia. 
Gills splitting longitudinally . . xviii. Schizopuylluu. 
Gills anastomosing xix. Lenzites. 
* Plant membranaceous, stem central . . iv. Hiatula. 
