The development of wall layers and ornamentation of ascospores, plus specialized plasmic structures, are studied with the electron microscope in members of the Morchellaceae, Helvellaceae, Rhizinaceae, Thelebolaceae, and Sarcoscyphaceae; additional results in the Pyronemataceae are given. The findings are compared with those of former studies (Merkus, 1973, 1974, 1975). A general discussion on the origin and development of the different structures concludes the series. A classification based upon species representing typical developments of all the species of the four studies is made.

Persoonia - Molecular Phylogeny and Evolution of Fungi

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Naturalis journals & series

Merkus, Emily. (1976). Ultrastructure of the ascospore wall in Pezizales (Ascomycetes)—IV. Morchellaceae, Helvellaceae, Rhizinaceae, Thelebolaceae, and Sarcoscyphaceae. General discussion. Persoonia - Molecular Phylogeny and Evolution of Fungi, 9(1), 1–38.