Page:The Oak.djvu/180

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The Oak (Marshall Ward) Fig 46.jpg

Fig. 46.—Piece of oak-bark with fructification of Polyporus sulphureus.

The Oak (Marshall Ward) Fig 47.jpg

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