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Fig. 46.—Piece of oak-bark with fructification of Polyporus sulphureus.
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Fig. 47.—Piece of oak attacked by Polyporus sulphureus, the yellowish white mycelium of which is seen at c and d. (R. Hartig.)
Fig. 46.—Piece of oak-bark with fructification of Polyporus sulphureus.
Fig. 47.—Piece of oak attacked by Polyporus sulphureus, the yellowish white mycelium of which is seen at c and d. (R. Hartig.)
