. FiG. 195. — Log rotted by Polyporus schweinitzii. After von Schrenk. tocybe, Tricholoma, and Septobasidium. Root-rots are also due to other fungi, chiefly the following: Ozonium Root-rot (Ozonium omnivorum Sh.). — Elm, basswood, oak, cottonwood, mesquite, china tree, mulberry, apple, and pear are affected by this rot, which has been de- scribed and discussed on page 23.

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