. Comparative morphology of Fungi. Fungi. 286 COMPARATIVE MORPHOLOGY OF FUNGI hyaline ectostromatic cushion just beneath the periderm. The amount of this tissue formed varies widely. When a well-developed ectostroma is formed, pycnidia are formed within it. If this tissue is much reduced it remains sterile and, unless pycnia are formed in the entostroma, only perithecia are produced. At about the time the ectostroma ruptures the periderm, its tissues are colored yellow becoming a reddish orange. The perithecial initials are formed within the bark cortex beneath the ectostroma. Along with the d
. Comparative morphology of Fungi. Fungi. 286 COMPARATIVE MORPHOLOGY OF FUNGI hyaline ectostromatic cushion just beneath the periderm. The amount of this tissue formed varies widely. When a well-developed ectostroma is formed, pycnidia are formed within it. If this tissue is much reduced it remains sterile and, unless pycnia are formed in the entostroma, only perithecia are produced. At about the time the ectostroma ruptures the periderm, its tissues are colored yellow becoming a reddish orange. The perithecial initials are formed within the bark cortex beneath the ectostroma. Along with the development of the perithecia, there is production of entostromatic mycelium. This may be so vigorous that a large stromatic mass containing only the remnants of the bark cells is pushed up through the periderm. In these larger stromata the ecto- stroma can no longer be distinguished (P. J. Anderson, 1913). This species has done much damage to Castanea in the United States and Eastern Asia (Shear, Stevens and Tiller, 1917). Endothia gyrosa and E. singularis show a great growth of entostroma, resulting in a large crumbly mass of fungus tissue in which only the rem- nants of the bark cells may be found. This genus must have arisen as a divergent line from some ancestor of Valsa and Leucostoma rather than directly from the latter. Xylariaceae.—The haplostroma- tic type is most marked in the last family (Tavel, 1892; Theissen, 1909). 186.—Endothia parasitica, l. Sec- rp^e smipier genera, as Nummularia, tion of pycnium. 2. Section of perithecial ,. *^ t , x x1 t^ stroma. (After Heald, 1913.). «*Sitt$x mmmlr. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gäumann, Ernst Albert, 1893-1963; Dodge, Carroll William, 1895-. New York [etc. ] McGraw-Hill Book Company, Inc.
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