. Bulletin. Plant diseases -- United States. 21 The, sporophores grow either on the roots of an affected tree or on the trunk, the former being the usual position. When growing on the ground the pile us is supported on a ver}' short stalk; it is sessile when growing from the trunk. There are usually several shelves which are grown together at the center in the ground form, or grown one above the other in the trunk form (see text figure 1 and PI. I, fig. 1). The whole body varies greatl}" in size. The smallest specimens collected during the past summer were 4 inches (lO^"") in di
. Bulletin. Plant diseases -- United States. 21 The, sporophores grow either on the roots of an affected tree or on the trunk, the former being the usual position. When growing on the ground the pile us is supported on a ver}' short stalk; it is sessile when growing from the trunk. There are usually several shelves which are grown together at the center in the ground form, or grown one above the other in the trunk form (see text figure 1 and PI. I, fig. 1). The whole body varies greatl}" in size. The smallest specimens collected during the past summer were 4 inches (lO^"") in diameter; the largest about 14 inches (35""^). The hjnnenial layer begins to form some three days after the body of the pileus is com-. Fiu. 1.—Folypuras Fr. growing on u fallen Fir. plete, so that there is always a wide band of sterile h3'phj« on the under side of the pileus during the period that the pileus is growing in width. When this growth stops, the tubes gradually form close up to the edge. The h3'menium when f n^sh is rose colored; when touched or bruised it turns dark red very cpiickly. The bright colors of the 3'oung pileus gi'tiduallv give wa\^ to more su)>dued ones as th(^ fungus grows older. A few days after growth has come to a standstill, the spores ripen and begin t(^ bi; discharged. T'hey come off in clouds plainly visible to the naked eye. Slips of glass placed under the pileus and left overnight had so thick a layci- of spores deposited. 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 United States. Division of Vegetable Physiology and Pathology. Washington : G. P. O.
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