Abstract
The life cycle, morphogenesis and aspects of the fine structure of a ligulate Desmarestia species from the Brunswick Peninsula (southernmost Chile) are described. Unilocular meiosporangia develop, without change of size and shape, from outer cortical cells. Gametophytes are monoecious and become fertile at temperatures ≤ 10°C. Compared to the morphogenesis of sporophytes of other ligulate Desmarestiales, growth of the main axis stops relatively early during development, resulting in the stout appearance of the adult sporophytes. Up to 20 primary laterals have meristems and develop into corticated lateral branches. Secondary laterals with meristems develop into blades. The main axis and the lateral branches become dentate as a result of the cortication of laterals without meristems. Cells of the axial filament are surrounded by many hypha-like cells, and the cross walls of both kinds of cell have numerous plasmodesmata. Physodes occur in every cell type. The characteristics of this species are compared wit...
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