basidium

basidium (plural, basidia) A specialized club­shaped sexual reproductive cell found in the fertile area of the hymenium . The fertile sexual spore-bearing tis­sues of all basidiomycetes, and that produces sexual spores on the gills of mushrooms. Shaped like a base­ball bat, it possesses four slightly inwardly curved horns or spikes called sterigma on which the basid- iospores are attached.

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