Showing papers on "Lygodium published in 1982"
TL;DR: The shoot of Lygodium is an extreme example of the phenomenon of leaf elaboration common to many ferns, and the complex nature of the leaves and simple morphology of the stem indicate a specialization of function within the shoot rather than the retention of a primitive, poorly differentiated organography.
Abstract: The leaves of the climbing fern Lygodium are borne on the dorsal surface of a subterranean rhizome and undergo a twining growth to form the aerial portion of the shoot. These leaves have a number of structural and functional analogies to the entire shoot of some twining flowering plants: continuous apical growth, circumnutation, a delay in leaflet expansion below the leaf apex, and budlike resting leaflet apices. The development of the shoot system of L. japonicum (Thunb.) Sw. and L. microphyllum (Cav.) R.Br. was investigated to determine their organographic relationships. The determinate primary leaves and the indeterminate climbing leaves initiate from a single cell on the flank of the apical meristem and are strictly foliar in nature, structurally homologous with each other and with the leaves of other ferns. Dichotomous branching occurs in a manner undocumented for this genus. The shoot of Lygodium is an extreme example of the phenomenon of leaf elaboration common to many ferns. The complex nature of ...
47 citations