マツバラン地上茎の二又分枝(予報)

概要

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The dichotomy in the aerial shoot of Psilotum nudum has the tendency that the axes are decussate and the same order bifurcation occurs at the same level. The branching is developed in rapid succession of bifurcation of the shoot apex followed by elongation of the axes produced. As regards the appendage-dichotomy (or trichotomy) relationships B_<IERHORST> (1954, 1971) reported that an appendage is produced in the axil of each of the bifurcations (or trifurcations) and such an appendage may be shifted in position to a point slightly to one side of the axil or even above it. In some respects his interpretation on the relationships in the young shoot may not coincide with those in the adult one. In the young aerial shoots examined, appendages are produced at the various outer sides, showing no apparent regularity, but the bifurcation always occurs in a plane which is perpendicular to the major axis of the elliptical outline of the young axes. The symmetrical dichotomy may have a relationship with the characteristic development.
日本植物分類学会の論文
1976-09-30