. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECT! 303 The germ tubes arise from any cell of the spore, and it is stated that they may enter the host either by means of the stomates or by directly penetrating the cuticle. This fungus grows vigorously in pure cultures. Upon prune agar it has been found (Jones) that the spores might be produced as a chain of two, and on account of this character the plant has been placed in the related genus Alternaria. As is, of course, well known, the step from Macrosporium to Alte
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECT! 303 The germ tubes arise from any cell of the spore, and it is stated that they may enter the host either by means of the stomates or by directly penetrating the cuticle. This fungus grows vigorously in pure cultures. Upon prune agar it has been found (Jones) that the spores might be produced as a chain of two, and on account of this character the plant has been placed in the related genus Alternaria. As is, of course, well known, the step from Macrosporium to Alternaria is at best a very slight one, yet it should be remembered that these genera based upon recognizedly variable characters serve at most for convenience. The catenulate method of spore production has been reported only in artificial cul- tures in this case, and it is possible, furthermore, to ob- tain for various fungi in such cul- tures in general many variations from what would be considered the normal type of spore production upon the host. Attention may be called to the fact that cultures of many Stilbeae yield upon agar only simple conidiophores. Cul- tures of Fusarium and Glceosporium are also modified in an equiva- lent manner, the stromatic development being usually suppressed. Species of Cercospora also produce spores in an abnormal manner. Upon the leaf Macrosporium may be accompanied by one or more species of true Alternaria, but the latter are saprophytic, as deter- mined by experimental Fig. 137. Spores Macrosporium Solani: germinating with HypH/E entering Stomata (After Jones). 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 Duggar, Benjamin M. (Benjamin Minge), 1872-1956. Boston ; New York : Ginn
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