. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 262 MYCOLOGY spores in Phoma are colorless and unicellular. The pycnidia are black with a terminal pore and depressed in the tissues of the host. The genus is arbitrarily limited to those species in which the spores are less than 15/4, for the larger spored forms have been placed in the genus Macrophoma. The most important species from the pathologic viewpoint are out of the iioo species recognized the^oUowing: Phoma beta is the cause of the heart rot and blight of beets. Phoma batata p
. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 262 MYCOLOGY spores in Phoma are colorless and unicellular. The pycnidia are black with a terminal pore and depressed in the tissues of the host. The genus is arbitrarily limited to those species in which the spores are less than 15/4, for the larger spored forms have been placed in the genus Macrophoma. The most important species from the pathologic viewpoint are out of the iioo species recognized the^oUowing: Phoma beta is the cause of the heart rot and blight of beets. Phoma batata produces a dry rot of sweet potato; while Phoma solani behaves much. Fig. 104.—Microscopic characters of apple blotch fungus (Phyllosticta solitaria). section of pycnidium showing pycnospores; 2, 3, 4, 5, mature pycnospores; 6, 7, 8, germinating spores; 9, myceUum. (After ScoU. W and Rorer. J. B., Bull. 144, U. S. Bureau of Planl Industry, pi. Hi, March 16, 1909.) like the damping-off fimgus, attacking seedling egg plants near the sur- face of the ground. The most destructive fungus of the genus Sphcerop- sis is S. malorum which causes the decay of apples, quinces and pears and attacks the stem of the apple tree producing characteristic cankers. The genus includes about 180 species. The 150 species of the genus Coniothyrium are widely spread geographically. The blight of rasp- berry canes is due to Coniothyrium Fuckelii, which has only recently come into prominence in the United States. The genus Septoria in-. 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 Harshberger, John W. (John William), 1869-1929. Philadelphia : P. Blakiston's Son & Co
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1917
