Diseases of deciduous forest trees Diseases of deciduous forest trees diseasesofdecidu00schruoft Year: 1909 SAP-ROTS OF SPECIES OF DECTDUOITS TREES. 57 trunk. The forest fire may not seem to have injured tlie 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 bark, and the decay caused by the fimgus exte
Diseases of deciduous forest trees Diseases of deciduous forest trees diseasesofdecidu00schruoft Year: 1909 SAP-ROTS OF SPECIES OF DECTDUOITS TREES. 57 trunk. The forest fire may not seem to have injured tlie 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 bark, and the decay caused by the fimgus 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 3ear 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 styracijlua L.), white oak {Quercus alba L.), scarlet oak {Q. coccinea Muench.), red oak (Q. rubra Li.), black- jack oak {Q. marilandica Muench.), shingle oak (Q. imbricaria Michx.), sugar maple {Acer saccharum Marsh.), silver maple (A. saccharinum'L.), red maple (A. rubrum L.), yellow birch {Betula lutea Michx. f.), chestnut (Castanea dentata (Marsh.) Borkh.), shagbark hickory (Hicoria ovata (Mill.) Britton), tulip poplar (Liriodendron tulipifera L.), black cherry (Prunus serotina Ehrh.), beech (Fagus atropunicea (Marsh.) Sudworth), and willow (Salix sp.). 149 Fig. 7.—a living tree of red oak the bark of which was killed by fire. The fungus Polystictus pergamenus is rapidly rotting the sapwood beneath.
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