. The essentials of botany. Botany. IMPERFECT FUNGI 239 producing whitish or discolored spots, and eventually developing small perithecia-like structures (pycnidia) containing conidia. Species of Phyllosticta are common on leaves of Virginia creeper, wild grape, cottonwood, willow, pansy, peach, apple, wild cherry, elm, etc., while species of Septoria are to be found on leaves of box-elder, aster, thistle, evening primrose, wild lettuce, plum, elder, etc. 412. The Black-dot Fungi (Order Melanconiales) differ from the preceding mainly in the absence of a distinct perithecium, the spores develop
. The essentials of botany. Botany. IMPERFECT FUNGI 239 producing whitish or discolored spots, and eventually developing small perithecia-like structures (pycnidia) containing conidia. Species of Phyllosticta are common on leaves of Virginia creeper, wild grape, cottonwood, willow, pansy, peach, apple, wild cherry, elm, etc., while species of Septoria are to be found on leaves of box-elder, aster, thistle, evening primrose, wild lettuce, plum, elder, etc. 412. The Black-dot Fungi (Order Melanconiales) differ from the preceding mainly in the absence of a distinct perithecium, the spores developing beneath the epidermis of the host and bursting through so as to form Fig. 115.—Septoria. Fig. 116.— FiQ. 117.—Ceroospora. small dark-colored or black dots (acervuli). Species of Gloeosporium and Melanconium are common on leaves, fruits, and twigs. 413. In the Molds (Order Moniliales) the conidia- bearing threads emerge through the stomata of the host, or grow out through the outer decaying tissues, forming moldy patches or masses. Here are many common parasites ( species of Ramularia, Cercospora, Fusi- cladium) and saprophytes (Monilia, Botrytis, etc.), some of which are both parasitic and saprophytic. Laboratory Studies. Although the Imperfect Fungi are quite too difficult for the beginner to do much with, it is well that he should become somewhat familiar with their general appearance; accordingly a few studies are 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 Bessey, Charles E. (Charles Edwin), 1845-1915; Bessey, Ernst Athearn, 1877-1957. joint author. New York, H. Holt and company
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