ANALYTICAL KEYS. 311 



5 Gills sub-triangularly decurrent. . . Deconica. 



(Jills not decurrent Psilocybe. 



But few species of Psathyra, Deconica, Chitonia and Pilosace are noted 

 from the United States. None are here described. 



THE BLACK-SPORED AGARICS. 



Pileus present to which the gills are attached i 



Pileus wanting, gills attached to a disk at apex of stem 



from which they radiate Montagnites.* 



1 Gills more or less deliquescing, or pileus thin, membranous 

 and splitting between the lamina? of the gills and becom- 

 ing more or less plicate . Coprinus. 32 



Gills not deliquescing, etc. . . . . 2 



2 Spores globose, ovoid 3 



Spores elongate, fusiform (in some species brown), plants 



with a slimy envelope Gomphidius. 49 



3 Pileus somewhat fleshy, not striate, projecting beyond the 

 gills at the margin ; gills variegated in color from groups 



of dark spores on the surface 4 



Pileus somewhatfleshy, margin striate, gills not variegated. Psathyrella. . . 48 



4 Annulus wanting, but veil often present Panaeolus. ... 45 



Annulus wanting, veil appendiculate on margin of cap. . Chalymotta. . . 48 



Annulus present Anellaria. 



(* One American species in Texas.) 



GLOSSARY OF THE MORE TECHNICAL TERMS USED IN 



THIS WORK. 



Abbreviations : 



cm . = centimeter (about 2> 2 cm. make one inch). 



mm.= millimeter (about 25 mm. make i inch). 



H = one micron (iooo/- t = i mm.). 



Adnate, said of the gills when they are attached squarely, or broadly, to the stem. 

 Adnexed, said of gills when they are attached only slightly or only by the upper 



angle of the stem. 



Anastomose, running together in a net-like manner. 



Annulus, the ring or collar around the stem formed from the inner or partial veil. 

 Appendiculate, said of the veil when it clings in fragments to the margin of the 



pileus. 



Arachnoid, said of the veil when it is cobwebby, that is, formed of loose threads. 

 Ascus, the club-shaped body which bears the spores inside (characteristic of the 



Ascomycetes). 

 Basidium (pi. basidia) the club-shaped body which bears the spores in the Basid- 



iomycetes. These stand parallel, and together make up the entire or large 



part of the hymenium or fruiting surface which covers the gills, etc. Par- 



aphyses (sterile cells) and sometimes cystidia (longer sterile cells) or spines 



are intermingled with the basidia. 



Bulbous, said of the enlarged lower end of the stem in some mushrooms. 

 Circumscissile, splitting transversely across the middle, used to indicate one of 



the ways in which the volva ruptures. 



