. Fio. -280. â Tracheid of P(>w«destroyed by Polt/iiorun .lixtoti-'iiiouhf. The celbilose has been for the most part extnicted, and the waU« con- sist of lignin (wood-gum). Cracks occur in the dry secondary wall, while the wall (o, 0) remains intact. The spiral structure of the secondary wall causes cross- ing of the fissures in the walls of adjoining cells at tlie bordered pits, e, and at bore-holes, d, e ; where neither pits nor holes are. present the fissures are simple,/; (After H. Hartig.)

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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi