. Fio. "2215.âComparison of (dcnu ; the vaseuliir bundle and an underlying resin-canal are ^hll^vn. (After Woernle.) this way a corky layer is formed under the sporogenous cushion and gradually displaces it. If in a following year the cushion be again formed, the scar is ruptured and lieals as before. Needles frequently remain in jiosition for two, three, nr fnur years, but UKJst (jf tliem fall olf in the lirst autumn. I'mler the sporogenous cushion the cells «jf the mesoj)liyll inciease botli ill huiiiIkm' and size. in considering the twig-deformations, Woernle tlistinguishes t
. Fio. "2215.âComparison of (dcnu ; the vaseuliir bundle and an underlying resin-canal are ^hll^vn. (After Woernle.) this way a corky layer is formed under the sporogenous cushion and gradually displaces it. If in a following year the cushion be again formed, the scar is ruptured and lieals as before. Needles frequently remain in jiosition for two, three, nr fnur years, but UKJst (jf tliem fall olf in the lirst autumn. I'mler the sporogenous cushion the cells «jf the mesoj)liyll inciease botli ill huiiiIkm' and size. in considering the twig-deformations, Woernle tlistinguishes the I'orm assumed by tiie (i'//iii/iusj)(irt(iii/iinn on the needU's, as just descrii)ed, from a iorm wliich iiihal)ils tlie thicker twigs. JJoth cause deformation of twigs, but tlieir elfeets (Ullei as I'ollows: "The needle-iiibabitiiig form can only eause a slight swelling extendiiiLj almost regulaily round the whole twig: the twig- inliabitiii^,' loim, on the oilier liaiid, alwa^â s i;i\es |-ise to a \eiv
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Photo credit: © The Bookworm Collection / Alamy / Afripics
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectparasit, bookyear1897
