. Comparative morphology of Fungi. Fungi. 72 COMPARATIVE MORPHOLOGY OF FUNGI whose much-branched rhizoids are rooted in the substrate and bear on apical lobate processes, numerous thin, generally unbranched, hyphae which usually end with a sporangium (Fig. 41, 1). The zoospores arise, as in the Saprolegnieae, from peripheral protoplasm, shortly before evacuation the inner layer of the sporangial walls swells. The outer cuticular membrane is separated as a small lid at the top of the sporan-. Fig. 43.—Araiospora -pulchra. Development of oogonia. 1. Young oogonium with peripheral nuclei. 2. Fund
. Comparative morphology of Fungi. Fungi. 72 COMPARATIVE MORPHOLOGY OF FUNGI whose much-branched rhizoids are rooted in the substrate and bear on apical lobate processes, numerous thin, generally unbranched, hyphae which usually end with a sporangium (Fig. 41, 1). The zoospores arise, as in the Saprolegnieae, from peripheral protoplasm, shortly before evacuation the inner layer of the sporangial walls swells. The outer cuticular membrane is separated as a small lid at the top of the sporan-. Fig. 43.—Araiospora -pulchra. Development of oogonia. 1. Young oogonium with peripheral nuclei. 2. Fundament of central egg cell. 3. Mature egg cell whose copulation papilla is in contact with the antheridium. 4. Young oospore with peripheral, faveolate cells. ( X 860; after King, 1904.) gium, and the swollen portion forms a tube into which the swarm spores migrate (Fig. 41, 2) and from which they are liberated. This species possesses antheridia and oogonia whose development is still unknown. Araiospora is similar in structure and mode of life. It differs from Rhiphidium by the presence of two kinds of sporangia, simple and echinate types (Fig. 42). The latter possess a solid membrane and may pass through a resting period; they are formed under unfavorable growth conditions, such as poor nutrition, low temperature and in places where,. 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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