Stem fibrillose from the remains of the adnate universal veil.
Limacina (limas, a slug or snail, slimy). Page [61].
Cuticle of pileus viscid when moist, innately fibrillose or scaly, but not lacerated; flesh of pileus thick, firm; margin almost naked.
[*] Gills not discolored, nor becoming reddish.
[**] Gills discolored, usually spotted with reddish-brown.
Genuina. Page [67].
Cuticle of the pileus never moist or viscid; torn into downy or floccose scales. Flesh soft, not water-soaked; margin involute and slightly downy at first.
[*] Gills not changing color, nor spotted with red or black.
[**] Gills becoming reddish or gray, the edge at last generally with reddish or black spots.
Rigida (rigeo, to be stiff). Page [74].