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Development of the Ascocarp of Ceratocystis ulmi

Martin A. Rosinski
American Journal of Botany
Vol. 48, No. 4 (Apr., 1961), pp. 285-293
Stable URL: http://www.jstor.org/stable/2439340
Page Count: 9
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Development of the Ascocarp of Ceratocystis ulmi
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Abstract

A study of the development of the perithecium of Ceratocystis ulmi was conducted using classic histological techniques. This study revealed the presence of a singular combination of primitive and advanced characteristics. The perithecium possesses a simple centrum made up only of ascogenous hyphae and small, spherical asci, but croziers are formed prior to ascus formation, and the ascogenous hyphae are arranged in a hymenium. Since development of C. ulmi compares closely with most other accounts of development in other members of the genus Ceratocystis, it appears that Ceratocystis is a good taxon. In addition, because of its intermediate nature and because Ceratocystis is the type genus of the family Ophiostomataceae, this family should be placed in a separate order, the Ophiostomatales.

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