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Development of the Gametophytes and Embryos of Anemia, Lygodium, Playtycerium and Pyrrosia
Abstract
This study examines the relative phylogenetic position and class- ification of the pteridophytes Anemia, Lygodium, Platycerium, and Pyrrosia. Bower (1923-28), Holttum (1949), Sporne (1962), Nayar (1970), and Bierhorst (1971) considered Anemia and Lygodium to be relatively primitive ferns, whereas Platycerium and Pyrrosia are believed to be perhaps some of the most advanced pteridophytes, Ching (1940), however, placed Platycerium in a less advanced phylogenetic position than Pyrrosia. Moreover, Christensen (1906), Bower (1923-28), Copeland (1947), Holttum (1949), and Sporne (1962) placed Anemia and Lygodium in the Schizaeaceae along with Mohria and Schizaea, while Nayar (1970) and Bierhorst (1971) raised Anemia and Lygodium to family status the Anemiaceae and Lygodiaceae. Mohria was also placed in the Anemiaceae. Ching (1940) raised the genus to the family level i.e., the Platyceriaceae, and indicated a close relationship with Dipteris. Christensen (1938) and Copeland (1947) placed Pyrrosia in the Polypodiaceae and associated it with Pleopeltis. Moreover, Copeland (1947) remarked that it may have some affinity with Phymatodes. Ching (1940), who placed it in the Polypodiaceae, stated that it is possibly related to and derived from the Microsorium-Phymatodes complex.
Subject Area
Botany
Recommended Citation
CRUMBAKER, THOMAS NEIL, "Development of the Gametophytes and Embryos of Anemia, Lygodium, Playtycerium and Pyrrosia" (1976). ETD collection for University of Nebraska-Lincoln. AAI7625863.
https://digitalcommons.unl.edu/dissertations/AAI7625863