. Comparative morphology of Fungi. Fungi. FiG. 302.—Astraeus hygrometricus. 1. Mature fructification. 2. Section of young fructification, i, i', i", endoperidia; a', a", exoperidia; g, gleba. (Natural size; after Tavel and Bary.) in damp. The endoperidium ruptures irregularly or stellately at the top and the spores are dispersed. In Geaster velutinus (Cunningham, 1927), the mycelial layer consisting of a dense palisade, 1 to 2 mm. thick of coarse, deeply colored hyphae, is first differentiated from the ground tissue. In the next stage the primor- dia of the fleshy and fibrillose laye
. Comparative morphology of Fungi. Fungi. FiG. 302.—Astraeus hygrometricus. 1. Mature fructification. 2. Section of young fructification, i, i', i", endoperidia; a', a", exoperidia; g, gleba. (Natural size; after Tavel and Bary.) in damp. The endoperidium ruptures irregularly or stellately at the top and the spores are dispersed. In Geaster velutinus (Cunningham, 1927), the mycelial layer consisting of a dense palisade, 1 to 2 mm. thick of coarse, deeply colored hyphae, is first differentiated from the ground tissue. In the next stage the primor- dia of the fleshy and fibrillose layers of the exoperidium, the gleba and the sterile central tissue, the columella, are differentiated. The fibrillose layer consists of periclinally arranged large and small hyphae with later the addition of some hyphae similar to those of the mycelial layer. The fleshy, or inner layer of the exoperidium begins as a layer of large, com- pactly woven hyphae between the fibrillose layer and the gleba. The cell walls gelify and the tissue gradually becomes pseudoparenchyma. It is interrupted by the thickened base of the columella. Shortly after the differentiation of the fleshy layer begins, a dome of cavities appears between this layer and the columella. The cavities vary in size and shape, apparently being formed by the tearing apart of the hyphae. These cavities become lined with large inflated cells, the. 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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