Abstract
Ganoderma applanatum (Pers. ex Wallr.) Pat., a Phialophora sp., and possibly Coprinus atramentarius (Bull. ex. Fr.) Fr. showed a potential for causing locally severe damage to aspen in Wyoming. Cytospora chrysosperma Pers. ex Fr., Pholiota squarrosa (Pers. ex Fr.) Quel., an Ascocoryne sp., Pleurotus ostreatus (Jacq. ex Fr.) Kummer, Armillariella mellea (Vahl. ex Fr.), and a Libertella sp. all were associated with root diseases. Phellinus tremulae Bond. et Boris was not found in roots. Chemical evidence for the decay potential is given for six of the most frequently isolated fungi.

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