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REFERENCES

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  • Copelakd, E. B. (1947). Genera Filicum. Waltham, Mass .
  • Emmott, J. I. (1963). A cytotaxonomical investigation of north temperate species of the genus Phyllitis. Ph.D. thesis, University of Leeds.
  • Fernald, M. L. (1935). Critical plants of the Upper Great Lakes region of Ontario and Michigan. Rhodora, 37, 220.
  • Löve, A. (1954). Cytotaxonomical remarks on some American species of circumpolar taxa. Svensk. hot. Tidskr., 48 (1), 211.
  • Manton, I. (1950). Problems of Cytology and Evolution in the Pteridophyta. Cambridge .
  • Milde, J. (1864). Scolopendrium hybridum Milde. Verh, zool-bot. Ges. Wien, 14, 235.
  • Vida, G. (1963). A new Asplenium (Sectio Ceterach) species and the problem of the origin of Phyllitis hybrida (Milde) C. Christ. Acta bot. Acad. Sci. Hung., 9, 197.
  • Wagner, W. H. Jr. (1955). Should the American Hart's Tongue be interpreted as a distinct species Amer. Fern J., 45, 127.