. The fungi which cause plant disease . Plant diseases; Fungi. 484 THE FUNGI WHICH CAUSE PLANT DISEASE epidermis, lenticular to globose, thin membranous, opening by a pore; conidia small, ovate to elongate, continuous, hyaline or green; conidiophore short or almost obsolete. On leaves. In part =Guignardia, Valsonectria, Mycosphserella. The genus is a very large one of some eight hundred forms, few of which have been adequately studied. It differs from Phoma only in that it is foliicolous while Phoma is caulicolous, a distinction which. Fia. 335.—P. solitaria. 1, section through apple; 4, spore
. The fungi which cause plant disease . Plant diseases; Fungi. 484 THE FUNGI WHICH CAUSE PLANT DISEASE epidermis, lenticular to globose, thin membranous, opening by a pore; conidia small, ovate to elongate, continuous, hyaline or green; conidiophore short or almost obsolete. On leaves. In part =Guignardia, Valsonectria, Mycosphserella. The genus is a very large one of some eight hundred forms, few of which have been adequately studied. It differs from Phoma only in that it is foliicolous while Phoma is caulicolous, a distinction which. Fia. 335.—P. solitaria. 1, section through apple; 4, spores from apple blotch showing appendages; 6-7, germinating spores; 9, mycelium from corn-meal cultures. After Scott and Rorer. is not consistently maintained and which is untenable for generic limitation (see p. 478). The fungus produces leaf spots by killing or weakening the leaf tissue with its mycelium. The spots are circular or subcircular, unless rendered angular by obstruction by veins, and the pycnidia may usually be seen with a lens in old spots unless the color of the leaf forbids. Similar effects follow on fruits. P. ampelopsidis E. & M. on Ampelopsis is probably identical with P. labrusc«=Guignardia bidwellii. See p. 238. P. bellunensis Mart, on elm =Mycosphaerella ulmi. See p. 249. P. brassicse (Carr.) West on cabbage, etc. =Mycosphserella bras- siaecola.^ See p. 249. P. labruscse Thum. on the grape =Guignardia bidwellii. See p. 238. 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 Stevens, Frank Lincoln, 1871-1934. New York : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
