Definition of panther cap in US English:

panther cap

noun

  • A poisonous toadstool that has a brownish-gray cap with fluffy white spots and white gills, found in woodlands in both Eurasia and North America.

    Amanita pantherina, family Amanitaceae, class Hymenomycetes

    • ‘Panther caps are distinguishable by their brownish-colored caps with off-white warts.’
    • ‘I've tried Fly agaric mushrooms (and panther caps) in my misguided experimental phase, and they contain a lot of the things that are poisonous in datura.’