BIBLIOGRAFIA
- Bierhorst , D. W. 1956 . “ Observations on the aerial appendages in the Psilotaceae. ” . In Departement of Botany Vol. 6 , 176 – 184 . Ithaca : Cornell University . N.Y
- Bierhorst , D. W. 1958 . Systematic change in the apex of Psilotum. . Bull. Torrey Bot. Club , 85 : 231 – 241 .
- Bierhorst , D. W. 1971 . Morphology of vascular plants. 153 – 192 . The Macmillan Company. New York
- Molesworth , B. 1966 . Psilotum nudum in Europe. . Brit. Fern Gaz. , 9 ( 7 ) : 249 – 251 .
- Parihar , N. S. 1977 . The biology and morphology of Pteridophytes. Central Book Depart. 660 pp. Allahadad
- Salvo , A. E. 1982 . Flora Pteridofítica de Andalucía. Málaga
- Walker , T. G. 1984 . Stomata in Psilotum and Tmesipteris. . Fern. Gaz. , 12 ( 6 ) : 351 – 354 .