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Ascocarp Development in Chaetomidium arxii (Chaetomiaceae) with Special Emphasis on the Ontogeny of Its Cephalothecoid Peridium

Gerald L. Benny, Don A. Samuelson and James W. Kimbrough
Botanical Gazette
Vol. 141, No. 4 (Dec., 1980), pp. 347-352
Stable URL: http://www.jstor.org/stable/2474593
Page Count: 6
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Ascocarp Development in Chaetomidium arxii (Chaetomiaceae) with Special Emphasis on the Ontogeny of Its Cephalothecoid Peridium
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Abstract

Chaetomidium arxii is a cleistocarpous ascomycete with a cephalothecoid peridium A coiled ascogonium is enclosed by an ascocarp that relatively early in its ontogeny produces several hairs from the outer row of peridial cells Centrum cells differentiate into ascogenous hyphae that produce the asci by a noncrozier process. The peridium consists of (1) an inner layer, four or more cells thick, with relatively thin and unpigmented walls, and (2) an outer layer, usually two cells thick, with walls that become thick and pigmented. Localized sites on specific cells of the outer peridial layer do not become thickened and pigmented These sites become more obvious as the ascocarp matures and later become the sutures between the cephalothecoid plates During the differentiation of the sutures they gradually detach so that the cephalothecoid plates must be held together by the inner peridial layer. At maturity the inner peridial layer deliquesces, allowing the cephalothecoid plates to be broken apart readily along the sutures The mature cephalothecoid plates usually radiate from a single hair of the ascocarp, and the peridium appears slightly elevated at the suture. The evolution and probable methods of ascospore dispersal are discussed for Ascomycetes with the cephalothecoid peridium.

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