STUDIES ON THE LEAF STRUCTURE IN SOME SPECIES OF LEUCOBRYACEAE. II. LEUCOPHANES OCTOBLEPHARIOIDES BRID. (LEUCOPHANEAE)

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  The leaves of the moss Leucophanes octoblepharioides consist of two layers of leucocysts embedding a single layer of chlorocysts. A strand of thick-walled oblong cells lie along the median longitudinal axis and along the margins of the leaves. The inner walls of leucocysts are usually thin, while the outer ones are relatively thick in the distal portion of the leaves. Pores are present on both inner and outer walls of leucocysts. The outer pores are very small and are distributed along the margins throughout the leaf length. This structural pattern is discussed in relation to the environmental conditions of the natural habitat of the moss. The chlorocyst ultrastructure shows some changes in the various regions of the leaf, denoting a certain degree of functional diversification in the overall chlorenchymatous tissue of the leaf.