They are difficult to define. The genus has been subdivided by botanists
into tribes which it may be well to enumerate. We have followed
Stevenson's arrangement.
He divides Cortinarius into six tribes.
1. Phlegacium = clammy moisture. In this tribe the cap is fleshy and
sticky (viscous), while the stem is firm and dry. In all Cortinarii the
gills become cinnamon-colored. There are many large-sized mushrooms in
this tribe, the cap sometimes measuring 6 inches across.
2. Myxacium = mucous. This tribe has the stem sticky (viscous), and the
universal veil is glutinous. The cap is fleshy but thin. Gills attached
to stem and decurrent.
3. Inoloma = fibre and fringe. It contains distinguished species. The
cap is at first silky, with innate scales or fibrils, is equally fleshy
and dry. The stem is fleshy and rather bulbous.
4. Dermocybe = skin and head. The cap and stem are both thinner in this
tribe than in Inoloma. The pileus becomes thin when old, and is dry, not
moist. It is at first silky.
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