These act chemically on the fibres and soften and expand them, causing the notched edges to become so prominent that they catch in one another.
"Ontario Teachers' Manuals: Household Management"
Ministry of Education
In the genus Tricholoma the volva and annulus are both wanting, the spores are white, and the gills are attached to the stem, but are more or less strongly notched or sinuate at the stem.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
The gills are broad, rather distant, broadly notched near the stem, and easily separating from the stem.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson