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TECHNICAL KEY TO THE GENERA OF MUSHROOMS<br />
TECHNICAL KEY TO THE GENERA OF MUSHROOMS<br />
The amateur collector who is simply interested in mushrooms as food<br />
need pay no attention to this key, but for the benefit of those who might be<br />
more interested in the classification of the mushrooms it was thought desirable<br />
to include one that is more technical. The following is based largely on an un-<br />
pubHshed manuscript of Dr. A. H. Smith, University of Michigan, and the<br />
keys of Singer (1951). These authors treat the mushrooms as an order, the<br />
Agaricales, and group the genera into famihes within the order. However,<br />
since there is still lack of agreement on the bases to be used for the erection of<br />
famihes in the Agaricales, this category has not been recognized here.<br />
This key is intended to show better the scientific bases for the separation<br />
of genera and more emphasis is placed on microscopic characters than in the<br />
previous key (p. 00). A great many more genera are recognized than have been<br />
used elsewhere in this book. Cantharellus and related forms that are not<br />
regarded as true agarics are not included. It was thought desirable to indicate<br />
the type species of each genus, and where the genus is relatively unfamihar, the<br />
older genus where the type species has been placed or would likely be sought,<br />
is indicated in brackets. This does not mean that all of the species included in<br />
the new genus were originally all in the same old genus. For example, the type<br />
of Leucopaxillus is L. tricolor which was formerly in Tricholoma but some<br />
other species now considered to belong in Leucopaxillus were formerly in<br />
Clitocybe. However, to those famihar with the species under the old names,<br />
this does give some idea of the concept of the newer genus.<br />
This is by no means a complete survey of the modern genera of Agari-<br />
cales; Singer (1951), for example, recognizes 145 genera excluding the Boleta-<br />
ceae. It does, however, include most of the genera that are Hkely to be found<br />
in Canada.<br />
1. Trama of pileus and stipe composed of both sphaerocysts and filamentous<br />
hyphae; spores amyloid, more or less ornamented 2<br />
1. Not with above combination of characters 3<br />
2. Latex present Lactarius<br />
L. deliciosus (L. ex Fr.) S. F. Gray<br />
2. Latex absent Russula<br />
R. lutea (Huds. ex Fr.) Fr.<br />
3. Parasitic on other agarics and flesh of pileus breaking down into<br />
a mass of chlamydospores<br />
A. (Nye talis) lycoperdoides (Bull.) Ditmar ex S. F. Gray<br />
3. Not parasitic on other agarics or if occasionally so then flesh of<br />
Asterophora<br />
pileus not breaking up to form chlamydospores 4<br />
4. Lamellae waxy in consistency, usually more or less decurrent 5<br />
4. Not with above combination of characters 7<br />
5. Spores amyloid Neohygrophorus<br />
N. (Hygrophorus) angelesianus (Smith & Hesler) Singer<br />
5, Spores not amyloid 6<br />
263
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