. Black rot, leaf spot and canker of pomaceous fruits. Black rot; Leaf spots; Canker (Plant disease); Apples. Black Rot, Leaf Spot, and Canker of Pomaceous Fruits 67 as in the case of the perithecium. The basal part is thinner in the case of the subglobose fruit bodies. This condition may be attributed to the fact that less protection is needed at the base; or perhaps here the thick- ness may be partially determined by mechanical pressure brought about by the resistance offered by the host tissue. Arising from the inner thin-walled cells are the pycnosporophores, which. FlG. 22. VARIATIONS OF
. Black rot, leaf spot and canker of pomaceous fruits. Black rot; Leaf spots; Canker (Plant disease); Apples. Black Rot, Leaf Spot, and Canker of Pomaceous Fruits 67 as in the case of the perithecium. The basal part is thinner in the case of the subglobose fruit bodies. This condition may be attributed to the fact that less protection is needed at the base; or perhaps here the thick- ness may be partially determined by mechanical pressure brought about by the resistance offered by the host tissue. Arising from the inner thin-walled cells are the pycnosporophores, which. FlG. 22. VARIATIONS OF PYCNIDIA OF PHYSALOSPORA CYDONIAE A, Typical simple unilocular pycnidium; B, pycnidium with long neck, similar to C but with an ostiolum; C, pycnidium similar to B, ostiolum not yet developed; D, pycnidium from apple leaf; E, hair-like out- growths on the tip of an ostiolum, developed under moist conditions; F, pycnidium with mound-like struc- ture at base; G, pycnidium which approaches in appearance the fruiting body o: species belonging to the form-genus Botryodiplodia extend entad. They are clavate, flask-shaped, or cylindrical. They may be as long as the spore itself, from 25 to 30 yu, or may measure less than Sju; the average dimensions are from 10 to 15 ju by 3 to 4/1. At the tip of each is developed a pycnospore. In some cases there is a mound-like structure at the base of the pycnidium (Fig. 22, f). This is illustrated by Duggar( 19091353, fig. 171). It has been a matter of conjecture whether this may appear only in an oblique tan-. 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 Hesler, L. R. (Lexemuel Ray). Ithaca, N. Y. : Cornell University
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectblackro, bookyear1916
