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acervulus An asexual structure, bearing conidia (i.e. thin-walled, asexual spores), that is formed by certain fungi parasitic (see parasitism) in plants. It consists of a mat of fungal tissue which bears a layer of conidiophores (i.e. specialized hypha that bear conidia); initially formed within the plant tissues, it later breaks through to the surface to release conidia.
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