. The fungi which cause plant disease . Plant diseases; Fungi. 644 THE FUNGI WHICH. CAUSE PLANT DISEASE Fig. 434.—lUospo- rium maculicola. After Saccardo. or mottled with gray and with a small gray spot near the center, 5-15 mm. in diameter; sporodochia hypophyllous, minute, gelat- inous, yellow-amber, becoming black, spherical, becoming discoid or irregular, 150-160 /x in diameter; conidio- phores branched; conidia oblong, x 4 /i. It is said by Sheldon '^^ to be one of the most common and destructive causes of leaf spots of the apple often resulting in nearly complete de- foliation. In
. The fungi which cause plant disease . Plant diseases; Fungi. 644 THE FUNGI WHICH. CAUSE PLANT DISEASE Fig. 434.—lUospo- rium maculicola. After Saccardo. or mottled with gray and with a small gray spot near the center, 5-15 mm. in diameter; sporodochia hypophyllous, minute, gelat- inous, yellow-amber, becoming black, spherical, becoming discoid or irregular, 150-160 /x in diameter; conidio- phores branched; conidia oblong, x 4 /i. It is said by Sheldon '^^ to be one of the most common and destructive causes of leaf spots of the apple often resulting in nearly complete de- foliation. In the centers of the leaf spots other spots bearing other species of fungi are often found, leading to the thought that perhaps the Illosporium in such cases results from secondary infection in the wounds made by the earlier fungus. The sporodochia are hypo- phyllous, often hidden by the normal pubescence of the leaf. Volutella Tode (p. 641) Sporodochia discoid, regular, margin ciliate, sessile or stipitate; conidiophores usually simple; conidia ovoid to oblong. Some seventy species. V. leucotricha Atk. Sporodochia convex-discoid, white to pale flesh-color; setae few, filiform, few-septate, subhyaline; conidiophores densely fasciculate, filiform; conidia oblong. On cuttings in greenhouses. V. fructi S. & H. Spots on the fruit, circular; sporodochia, numerous in concentric circles, subcuticular, erumpent, elevated 200- 250 M, 150-400 M in diameter; mj'celium black; setse distributed throughout the sporodo- chium, black, 0 to 3- septate, acute, smooth, 100-400 X 5-8 n; co- nidiophores elongate, hyaline, simple, 25-35 x 3 m; conidia smooth, oblong-fusoid to falcate-fusoid, hyaline or sub-olivaceous, 17-23 X Fig. -V. fructi. Sporodochia in section. After Stevens and 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 perfect
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
