Journal
GRANA
Volume 45, Issue 1, Pages 22-60Publisher
TAYLOR & FRANCIS AS
DOI: 10.1080/00173130500520453
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Megaspore morphology in the lycopod family Selaginellaceae is studied using scanning electron microscopy. The 52 species examined correspond to taxa included in a molecular phylogenetic analysis of the family, based on rbcL gene sequences, and represent the morphological and geographical variation found within the group. Surface sculpture and wall structure are described. A revised terminology to describe the continuum seen in wall structures is presented. The morphological variation is discussed in a phylogenetic context and several putative synapomorphies of clades within the family are identified. This study allows us to assign extant and fossil megaspores to monophyletic groups within the Selaginellaceae.
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