. Fig. 236. âSections of a twig of Savin attacked by G. aahlnae. n, At thickest part of the swelling ; b, 3 cm. under a and normal. In It is shown one of the hollow teleutospore-cushions; five cushion-scars; in the second-year ring are two shaded zones of wood, chiefly composed of ixxronchyma. (x 25.) (After Woernle.) The sporogenous cushions of G. sabinac are formed in quite a different manner from those of G. davariaeformc. Beneath each cushion the bast increases very rapidly and forms an out- growth, which is still further enlarged by the addition to its apex of six or seven rows of radiall
. Fig. 236. âSections of a twig of Savin attacked by G. aahlnae. n, At thickest part of the swelling ; b, 3 cm. under a and normal. In It is shown one of the hollow teleutospore-cushions; five cushion-scars; in the second-year ring are two shaded zones of wood, chiefly composed of ixxronchyma. (x 25.) (After Woernle.) The sporogenous cushions of G. sabinac are formed in quite a different manner from those of G. davariaeformc. Beneath each cushion the bast increases very rapidly and forms an out- growth, which is still further enlarged by the addition to its apex of six or seven rows of radially arranged cells, rounder and smaller than the bast-cells of the cushion. The mycelium penetrates between these outer cells, and forms over the whole cellular outgrowth a pseudoparenchyma from which the sporo- f'enous tissue arises.
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Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectparasit, bookyear1897
