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Development of the Ascocarp in Glonium stellatum
E. S. Luttrell
American Journal of Botany
Vol. 40, No. 8 (Oct., 1953), pp. 626-633
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/2438451
Page Count: 8
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Glonium stellatum produces flask-shaped pycnidia containing microconidia and ascocarp initials on the surface of a subiculum of coarse, dark-brown hyphae. The ascocarp originates as a globular, parenchymatous stroma. An ascogonium is formed within the stroma. By horizontal growth the stroma develops into a long cylindrical ascocarp. Ascogenous hyphae derived from the ascogonial cells grow outward through the sterile parenchyma in the interior of the stroma, keeping pace with the elongating tip. A locule is formed, in part by the disintegration of the sterile stromal tissue above the ascogenous hyphae, in part by the growth of pseudoparaphyses. The pseudoparaphyses originate as outgrowths from the stromal cells above the ascogenous hyphae. They grow downward into the locule as distinct hyphae prior to the formation of the asci. At maturity the black carbonaceous ascocarps contain a single elongated locule occupied by a continuous layer of asci and persistent pseudoparaphyses. The ascocarp opens by a longitudinal split in the stromal tissue above the locule. The asci are bitunicate. The relationships of the Hysteriaceae lie with the Pseudosphaeriales in the series of ascostromatic Ascomycetes included in the Ascoloculares or Bitunicatae.
American Journal of Botany © 1953 Botanical Society of America, Inc.