Fungous diseases of plants . ribed asa new species, Clitocybe parasitica. He has found this fungusconstantly associated with the root rot of the apple, and also witha similar disease of peach and cherry, as well as of certain nativespecies of oak. Other observers have apparently not been ableto conclude that a Clitocybe is the cause of the disease prevalent 472 FUNGOUS DISEASES OF PLANTS throughout that general region, and now notably destructive insections of Missouri. At any rate this species of Clitocybe is verycommon at least from Missouri southwestvvard, and occurs abun-dantly in regions
Fungous diseases of plants . ribed asa new species, Clitocybe parasitica. He has found this fungusconstantly associated with the root rot of the apple, and also witha similar disease of peach and cherry, as well as of certain nativespecies of oak. Other observers have apparently not been ableto conclude that a Clitocybe is the cause of the disease prevalent 472 FUNGOUS DISEASES OF PLANTS throughout that general region, and now notably destructive insections of Missouri. At any rate this species of Clitocybe is verycommon at least from Missouri southwestvvard, and occurs abun-dantly in regions in which the root rot of apples is unknown. Thisfungus occurs, for instance, during a favorable season in unlimitedquantity at Columbia, Mo., and may be found arising in largeclusters from the roots of hickory and other deciduous trees ; butno evidence in that vicinity of its appearance in orchards hascome to the attention of the writer, although constant search hasbeen made for it, particularly where orchards have succeeded. « Fig. 234. Clitocybe parasitica: a Cluster of Sporophores fromRoot of Hickory deciduous forests. The Clitocybe is unquestionably, however, aninjurious fungus, and it is quite possible that the failure to attackapples in certain regions is due to more favorable conditions forthe host. The fungus shown in Fig. 234 grows in very dense pileus is usually from 6 to 8 cm. in diameter, convex orumbonate in form, usually beset with minute scales, varying incolor frommottled buff to pale yellowish brown. The gills are palerand become mottled, noticeably decurrent at first, which charac-ter is still slightly evident with age. The stipe is usually 10-16 length, and up to i cm. in diameter, solid, usually curved, and AUTOBASIDIOMYCETES 473 somewhat darker in color than the i:)ileus. Rhizomorphs are pres-ent, and these, at maturity, are black in color. When growing;close beside the trunk or under the edge of fallen logs or brush,giant forms of the m
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