. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 247 second from the end, will develop one or several asci (Fig. 157, C, D). As in Penicillium, this growth becomes enveloped by a mass of hyphae that originate from the hyphae bearing the gametospore and from adjacent strands of the mycelium. These ascocarps appear at maturity as black specks and in the majority of forms they are provided with hair-like outgrowths that are very regular and characteristic of the genera (Fig. 158). The ends of these hairs are rather mucilaginous and may assist in the dissemination of the ascocarps
. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 247 second from the end, will develop one or several asci (Fig. 157, C, D). As in Penicillium, this growth becomes enveloped by a mass of hyphae that originate from the hyphae bearing the gametospore and from adjacent strands of the mycelium. These ascocarps appear at maturity as black specks and in the majority of forms they are provided with hair-like outgrowths that are very regular and characteristic of the genera (Fig. 158). The ends of these hairs are rather mucilaginous and may assist in the dissemination of the ascocarps. The ascospores are resting. Fig. 158. Forms of ascocarps found among the powdery mildews: A, Phyllactinia with needle-like appendages enlarged at the base. B, Micro- sphaera, appendages dichotomous at apex. C, Uncinula, appendages coiled at apex. D, Erysiphe without appendages and crushed to show escaping asci. E, ap ascus containing six ascospores. spores adapted to enduring drought and cold as in Penicillium, which they resemble in their discharge and germination. 92. Reduced Ascomycetes.—Space will only permit the consideration of two other groups from this enormous alliance of the Ascomycetes. These forms are here considered partly because of their economic importance and partly because they illustrate the reduction that may go on in the plant body. These two groups of fungi have become so changed and simplified in their structure and life history as to render impossible a guess as to their relationship to other 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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