. Fio. 22S.—Tangential section through diseased wood beneath a spore-cushion. The wood- elements are much displaced by abnormal tracts of parenchyma. (Only one of the latter has been filled in, the others left blank.) (After Woernle.) of the twig-inhabiting form is due more to increased growth of the cortical cells than to increase of bast-parenchyma; in the needle-form, however, the swelling is the result of increase of the bast, especially of the bast-parenchyma. In twigs infected by the needle-form, the mycelium may be found all round, but it has difficulty in making its way radially to the
. Fio. 22S.—Tangential section through diseased wood beneath a spore-cushion. The wood- elements are much displaced by abnormal tracts of parenchyma. (Only one of the latter has been filled in, the others left blank.) (After Woernle.) of the twig-inhabiting form is due more to increased growth of the cortical cells than to increase of bast-parenchyma; in the needle-form, however, the swelling is the result of increase of the bast, especially of the bast-parenchyma. In twigs infected by the needle-form, the mycelium may be found all round, but it has difficulty in making its way radially to the cambium; in the twig-form the mycelium, as early as the spring following infection, will be found to be in close contact with the cambium on the infected side, although it requires several years to pass round to the cambium on the opposite side of the twig. The mycelium and spores of the two forms differ little from each ; '
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
