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Description: A phylogenetically diverse group of fungi all with more or less globose fruiting bodies, internal tissue which is quite firm and compact when young, but a powdery mass of spores when mature. Geastrum looks unusual because of its additional outer wall layer, which splits and folds back like a row of petals. Most of the fungi in this group are saprobes, but Scleroderma, Pisolithus and Rhizopogon are ectomycorrhizal.

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