What is "buttonlike"

Usage examples of "buttonlike".

Mushrooms were the object of Ude's pilgrimage onto the lea in Fat Boy Ichimada's field: slender white stalks with buttonlike heads, slightly brownish, growing in small clumps.

Finally, at the bottom of the spine are four buttonlike remnants of vertebrae that once formed part of a tail (when the animals ancestral to man had tails).