Species diversity and distribution of Pteridophytes in Mt. Pangasugan [Philippines]
1993
Belonias, B.S. | Banoc, L.M. (Visayas State Coll. of Agriculture, Baybay, Leyte (Philippines). Dept. of Plant Breeding and Agricultural Botany)
A total of 92 species of Pteridophytes belonging to 24 families and 52 genera were found in Mt. Pangasugan at elevation of 5-400 m above sea level (ASL). This includes 21 families of ferns with 49 genera and 83 species, and 3 families of fern-allies with 3 genera and 9 species. Only 83 species had been identified. The families Polypodiaceae and Aspleniaceae were the most diverse in terms of number of genera and species, the former having 8 genera and 11 species; the latter, 7 genera and 11 species. Species diversity was found to be low (11 to 24 species) at 5-80 m ASL, increased up to 40 species at 81-100 m ASL but gradually declined to as low as 15 at 101-340 m ASL. Majority of the Pteridophytes collected were terrestrial. The aquatic species comprised only 2.2 percent; the epiphytes, 17.4 percent and the petrophytes, 15.2 percent. Selaginella cuppressima and Tectaria denticulata were the most widely adapted accross different elevations followed by Angiopteris palmiformis and Microsorium punctatum and then by Lygodium japonicum. According to elevation, Selaginella cuppressima was found to be the best adapted at lower elevations of 61-80 m ASL while Tectaria denticulata favored higher elevations at 61-400 m ASL
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