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dimidiate (adjective) – shielded, covered; shaped like a shield or like a tent; (1) most commonly applied to a perithecium with an incomplete shield-like, expanded exciple (or involucrellum), i. e., a perithecial wall (or involucrellum) that does not enclose the whole perithecium, but instead extends sideways, covering the upper part of the perithecium like a shield or tent; (2) sometimes also used to describe a clypeus; (3) most generally referring to any ascocarp that lacks the lower part of the exciple and is thus not completely enclosed.

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