Abstract
A revision of the genusCeratopteris is presented based on comparative morphology and geographical distribution. Four species are recognized:C. thalictroides, C. cornuta, C. pteridoides, andC. richardii. Characteristics of taxonomic importance include frond length, shape, and dissection; stipe width; insertion of basal pinnae; bud development; habit; annulus cell number; spore number per sporangium; spore size; and spore surface features. Evolution within species and putative hybridization between species are discussed.
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Lloyd, R.M. Systematics of the genus Ceratopteris Brongn. (Parkeriaceae) II. Taxonomy. Brittonia 26, 139–160 (1974). https://doi.org/10.2307/2805883
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DOI: https://doi.org/10.2307/2805883