La paroi des asques chez les Pyrénomycètes : étude ultrastructurale. I. Les asques bituniqués typiques

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Abstract

A complex and homogeneous organization is present in the ascus wall of typical bitunicate Pyrenomycetes. First unitunicate, the wall soon becomes bitunicate. A clear space then separates both tunicae (exoascus and endoascus); it is formed by the lysis of the external part of the endoascus. In the mature ascus the exoascus is composed of two superposed layers and the endoascus of a single layer which shows remarkable accordion-like fibrillas.The essential structural feature of the bitunicate ascus wall is the presence, in the Pyrenomycetes as well as in lichenized and nonlichenized Discomycetes, of two tunicae, the inner (endoascus) presenting a wavy or folded fibrillar structure. In the Pyrenomycetes such a structure is much more distinct, however; a clear space in addition separates the exoascus and the endoascus.

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