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prototunicate (adjective,ascus term) – thin-walled and lacking distinct apical structures; referring to asci with an almost entirely reduced tholus; releasing spores by disintegration of the ascus wall (evanescence). Prototunicate asci are apparently evolved separately in the Lichinaceae and the calicioid Physciaceae (i. e., the "Caliciales"); possibly derived by reduction from more complex ascus structures still present in lecanoralean asci. Kind of:ascus dehiscence type.

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