. Fig. 234.—A few leaves enlarged from Fig. 233. The leaf to left hand bears pycnidia on red spots on the upper surface of the leaf; the remaining leaves bear aecidia on raised portions of their surface. Several aecidia still further enlarged show the peridia dehiscing by longitudinal slits, (v. Tubeuf del.) tissues occur in the year-rings as already described for G. davariaeforme, viz. thickened twisted tracheids, loosely connected together and with fissure-like pits; medullary rays more numerous and broader; the limits of the year-ring difficult to distinguish; and a yellow pigment deposited
. Fig. 234.—A few leaves enlarged from Fig. 233. The leaf to left hand bears pycnidia on red spots on the upper surface of the leaf; the remaining leaves bear aecidia on raised portions of their surface. Several aecidia still further enlarged show the peridia dehiscing by longitudinal slits, (v. Tubeuf del.) tissues occur in the year-rings as already described for G. davariaeforme, viz. thickened twisted tracheids, loosely connected together and with fissure-like pits; medullary rays more numerous and broader; the limits of the year-ring difficult to distinguish; and a yellow pigment deposited in the walls of all the elements. A tissue of this nature may be found round the whole circumference of a twig even in the first year after infection, and regularly each succeeding year. Woernle only rarely found zones of irregular cell-formation like those
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
