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CRYPTOGAMIA, 375 
_ The ics and the Boleti, numerous and beautiful 
tribes of plants, are now arranged in a method which the 
author hopes will be found sufficient to obviate the princi- 
pal difficulties which have attended the study of them, 
and to render the investigation of the species, at least as 
_ easy as any other part of the system. He therefore requests 
the attention of the reader to the following explanation of 
the principles on which they are arranged, referring him, 
for the preservation of the specimens, to what has been 
already said at page 38 and 39. 
AGARICS are composed of a Cap, or PrtEus, with 
Grits underneath, and have either SreMs or no Stems. 
5 ~ x 
The Stems are either central or lateral : hence arise 
3 primary divisions of the Genus, already in use, and 
adopted by Linnzeus. - : . 
A. Stems central, 
B. Stems lateral. 
~ C. Stemless. 
They have also a Root, more or less dbvious, and 
some of them, in a yet unfolded state, arewholly enclosed in 
a membranaceous or leather-like case, called a WRAPPER. 
Some of them have a Curtain, or thin membrane, ex- 
tending from the stem to the edge of the pileus; this cur- 
tain tears as the pileus expands, aud soon vanishes ; but 
the part attached to the stem often remains, forming a ring 
round it, This Rrnc is more or less permanent, as its 
substance is more or less tender, but some of the species 
appear some years with, and other years without a Ring,* 
so that though it forms a very obvious character, it cannot 
be admitted as a ground of specific distinction. 
Pl. 19, fie. (F.) (borrowed from M. Bulliard,) shews a 
vertical ation Cr 4 Agaric of thor: compleat kind, in 
its egg-state, in order to demonstrate all the parts mentioned 
above.—(m.m.m.m.mi.) the Wrap .—(n.n) the Pileus. 
(0. 0.) the Gill.—(p.) the Stem, fore it shoots up.— 
(q--q.) the Curtain. On the section of a Stem at (B.) 
* e.g. Ag. eruginosts. 
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