. Nature and development of plants. Botany. 242 SEXUAL REPRODUCTION OF ASPERGILLALES tremely small and numerous spores float off in the air as an invisible dust and quickly germinate under favorable conditions, forming new mycelia. The male and female gametangia have departed considerably from the form shown in the cup fungi. They now appear as short, slightly modified branches of the hyphae and have lost the tubular outgrowth so characteristic of the Pezizales and red. Fig. 152. Formation of spores or conidia in the Aspergillales: A, spore- bearing hypha of Aspergillus. B, hypha of green moul
. Nature and development of plants. Botany. 242 SEXUAL REPRODUCTION OF ASPERGILLALES tremely small and numerous spores float off in the air as an invisible dust and quickly germinate under favorable conditions, forming new mycelia. The male and female gametangia have departed considerably from the form shown in the cup fungi. They now appear as short, slightly modified branches of the hyphae and have lost the tubular outgrowth so characteristic of the Pezizales and red. Fig. 152. Formation of spores or conidia in the Aspergillales: A, spore- bearing hypha of Aspergillus. B, hypha of green mould, Penicillium. C, one of the terminal branches of B enlarged, showing manner of spore formation. algae. However they become closely intertwined (Fig. 153) and the ends of the branches meet, thus the mingling of the gametes is made possible through a dissolution of the separating walls at the tips of the gametangia. The resulting gametospore remains attached to the parent plant and germinates at once, forming an irregular hyphal outgrowth (Fig. 153, B, s) which becomes completely overgrown by the hyphae of the mycelium (Fig. 153, B, C). Thus is formed a solid ascocarp or perithecium (plu. perithecia), that appears to the eye as a minute grain of sand. During this growth numerous lateral branches arise on the hyphae derived from the gametospore and become trans-. 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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