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Peziza praetervisa         Fireplace Cup

You often find this cup fungus growing amongst charcoal remnants in an old fireplace site in campgrounds.   Also known as Peziza violacea because it is purplish when young.  Like many Discomycetes however, it goes through a number of  'morphs' as it ages.  Peziza species are not easy to identify without a microscope but in this case the location helps.

Fruitbodies are cup-shaped but become flattened with a wavy outline in age. They are thin and brittle. The inside is violet to violet-brown but ages brown. The outside is paler. Widespread and not uncommon, it fruits scattered or in clusters, amongst charred wood in campsite fireplaces.