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predehiscence (noun,ascus term, pl. predehiscences) – the stage during ascus ontogeny that precedes ascus dehiscence; four different kinds of predehiscence have been distinguished, some of these occurring together: (1) ascus from modification, usually an elongation of the ascus until the hymenium surface is reached (e. g., Asobolus); (2) changes in lateral walls, walls usually become thinner; (3) differentiation of an apical apparatus by formation of ring- or lid-like structures like an annulus or operculum or layer differentiation, often accompanied by a reduction of tholus height; (4) ascus liberation (i. e., the entire ascus breaks of at the base and the spores are released from the hymenium inside the ascus, e. g., Cerastomella).

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