crenately

The margins of these leaf-like branches are more or less crenately notched, the notches representing buds, as do the spine-clusters in the spiny genera; and from these crenatures the large showy flowers are produced.

Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various

The = pileus = is thin, at first firm, becoming soft, convex, then plane and often somewhat depressed in the center, usually even, dry, the margin in old plants crenately wavy, dull gray or smoky gray in color, with a fine down or tomentum.

Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. George Francis Atkinson 1886