. Diseases of deciduous forest trees. Trees -- Diseases and pests. SAP-ROTS OF SPECIES OF DECIDUOUS TREES. 57 trunk. The forest fire may not seem to have injured the tree at the time, although the heat may have been sufficient to kill the cambium layer over a considerable area. The bark over such areas dries out and cracks, and it is in such dead bark that this fungus finds a favor- able entrance. Within a few months after the injury the sporophores of Polystictus pergamenus are found growing on the dead hark, and the decay caused by the fungus extends rapidly throughout the deadened area (fig
. Diseases of deciduous forest trees. Trees -- Diseases and pests. SAP-ROTS OF SPECIES OF DECIDUOUS TREES. 57 trunk. The forest fire may not seem to have injured the tree at the time, although the heat may have been sufficient to kill the cambium layer over a considerable area. The bark over such areas dries out and cracks, and it is in such dead bark that this fungus finds a favor- able entrance. Within a few months after the injury the sporophores of Polystictus pergamenus are found growing on the dead hark, and the decay caused by the fungus extends rapidly throughout the deadened area (fig. 7). In almost any burnt area of decidu- ous forest one may find many of the standing trees after a year or two bearing large masses of the sporo- phores of this fungus. Polystictus pergamenus is universally distributed throughout the United States and Canada, and it is known from various points in South America. It grows on practically all the deciduous species of wood. It is very common on species of oak and has been collected by the writ- ers on the following woods: Red gum {Liquidambar styracifiua L.), white oak (Quercus alba L.), scarlet oak (Q. coccinea Muench.), red oak (), black- jack oak (Q. marilandica Muench.), shingle oak (Q. imbricaria Michx.), sugar maple (Acer saccharum Marsh.), silver maple (A saccharinum L.), red maple (.. I. rubrum I yellow birch (Betula lutea Michx. f.), chestnut (Castanea dentate (Marsh.) Borkh.), shagbark hickory (Hicoria ovata (Mill.) Britton . tulip poplar (Liriodendron tulipifera L.), black cherrj '' Ehrh.), beech (Fagus atropunicea (Marsh.) Sudworth)3 and willow (Salix sp.). 149. Fig. 7.—Aliving tree of red oak the bark ofwhicb was killed by fire. The fungus Polystictus pergamenus is rapidly rotting thesapwood 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 or
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