. Diseases of deciduous forest trees. Trees -- Diseases and pests. 60 DISEASES OF DECIDUOUS FOREST TKEES. ing trees, and should, in the opinion of the writers, be considered as saprophytic forms. (See fig. 8.) DECAY CAUSED BY STEREUM FRUSTULOSUM. Stereum frustulosum (Pers.) Fr. and other S2:)ecies of Stcreiini cause the destruction annually of large quantities of structural tin> bers. The fruiting bodies of this fungus are very insignificant and generally escape the attention of the casual observer. They appear in the form of small, slightly elevated gray spots on the surface of decaying wo
. Diseases of deciduous forest trees. Trees -- Diseases and pests. 60 DISEASES OF DECIDUOUS FOREST TKEES. ing trees, and should, in the opinion of the writers, be considered as saprophytic forms. (See fig. 8.) DECAY CAUSED BY STEREUM FRUSTULOSUM. Stereum frustulosum (Pers.) Fr. and other S2:)ecies of Stcreiini cause the destruction annually of large quantities of structural tin> bers. The fruiting bodies of this fungus are very insignificant and generally escape the attention of the casual observer. They appear in the form of small, slightly elevated gray spots on the surface of decaying wood. In the majority of instances they look like sheets of cracked mud, the individual pieces separated by the cracks vary-. FlG. 9. A piece of oak timber rotted by Hiirtum fruflutoxum. The fruiting bodies are the hghtcr colored, irregular, small bodies which are seen thickly scattered over the surface. ing in size from one-sixteenth to one-fourth of an inch in diameter. Figure 9 shows a piece of red oak (Quercus rubra L.) with the fruit- ing bodies of this fungus. Wood decayed by Stereum frustulosum can alwa3's be recognized by the peculiar pocket-like formation in the mass of the wood. Fungi like Folystidus versicolor produce a form of rot in which the entire mass of the wood is affected. Stereum, frustulosum, on the other hand, causes changes in the wood fiber in localized areas of the wood. The holes are more or less lens sliaj)cd and are separated from one another by sound layers of wood fiber. The lining of the holes is usually composed of a layer of wliite cellulose fibers. Stereum frustw- 149. 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 Schrenk, Hermann von, 1873-; Spaulding, Perley. Washington, D. C. Govt. Print. Off
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