Abstract
Abstract Development of the blade in Weeksia fryeana from a cushion-shaped holdfast begins by initiation of a uniaxial bladelet. At an early stage in blade formation the apical cell of the bladelet stops functioning and lateral initials continue growing, converting the type of growth of the bladelet to what appears to be multiaxial. Development of tissues in Weeksia fryeana thalli is also described, showing that most medullary filaments in mature thalli are secondarily derived from large inner cortical cells. The significance of developmental studies to phylogeny of foliose red algae is discussed.
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