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    Peziza cerea

Frutibodies (apothecia) are up to 5 cm across, cup-shaped to saucer-shaped, often with a broadly toothed edge, lacking a stalk, and off-white to yellowish buff or pale olivaceous.  It fruits on old dirt floors of huts, garages or basements.  Not edible.

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Section Through Hymenium of an Apothecium

The hymenium contains asci, ascospores and paraphyses. Paraphyses are sterile cells' often with swollen tips and are at high turgor pressure. Tips of paraphyses squeeze tightly together at the surface of the hymenium forming a barrier called the epithecium. The high osmotic pressure of the cells of the epithecium makes it difficult for marauding microfauna such to penetrate and feed on the rich protoplasm below. To disperse spores, asci push between the paraphyses from below, shoot off their spores then collapse e.g. Peziza.

Micrograph from MycoAlbumCD by George Barron