. Carnegie Institution of Washington publication. INDUCTION, DEVELOPMENT, AND HERITABILITY OF FASCIATIONS. study of fasciation is naturally grouped about these two periods. The character of the fasciatcd rosette, with broad, linear heart, giving rise to stems flattened from the base, has been made familiar by de Yries (11). In the cultures such rosettes reached a breadth of 3 cm., and the stalk from one of them produced a vegetative line which eventually measured 38 cm. (plate i). In other cases the first evidence of fasciation in the rosette is a bifurcation of the growing- region, and two ti
. Carnegie Institution of Washington publication. INDUCTION, DEVELOPMENT, AND HERITABILITY OF FASCIATIONS. study of fasciation is naturally grouped about these two periods. The character of the fasciatcd rosette, with broad, linear heart, giving rise to stems flattened from the base, has been made familiar by de Yries (11). In the cultures such rosettes reached a breadth of 3 cm., and the stalk from one of them produced a vegetative line which eventually measured 38 cm. (plate i). In other cases the first evidence of fasciation in the rosette is a bifurcation of the growing- region, and two tiny buds sometimes appear even between the cotyledons. The two types f n>settes are illustrated by plate n, fig. 4, and by text-fig. 1. The faseiation of the flowering stalks is far more common than that of the rosette and furnishes the bulk of the material for observation, as well as for histological examination. Usually the rosettes have been plants to be kept for other experimental purposes, but the late branches may be cut at will. The flowering stems studied came mostly from two sets of plants—the wild (\ lucn nis and the (). cntciata in the g'arden. There were many ring- fasciations in the two groups, though these have been comparatively infre- quently reported. The O. biainis, besides simple fasciations and ring- fasciations, showed on many stems, associated with the banding, an indentation or groove, as represented in plate n, fig. 2, running up the upper half of the stem. The groove became wider and deeper as the stem flattened. Simple fasciati* >ns, ring-fasciations, and groove-fasciations occurred together, both on secondary and tertiary branches of plants of which the main axis had usually been stunted. Two descriptions may be taken as representative: PLANT plant had 11 branches, which were all equal in importance, the main tip having been stunted early in its history. There was consequently no main branch, though A was the largest secondary branch. T
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