Acrosorus friderici-et-pauli (Christ) Copel.

Etymology

After Karl Friedrich Sarasin (1859-1942) and his cousin Paul Benedikt Sarasin (1856-1929)

Family

Polypodiaceae

Type Specimen Information

F. & P. Sarasin 760, Sulawesi ("Celebes"), G. Matinang (BAS, BM).

Nomenclature

Acrosorus friderici-et-pauli (Christ) Copel., Philipp. J. Sci. 1(Suppl. 2): 159. 1906; Parris, Fl. Pen. Malaysia, Ser. I, Ferns & Lycoph. 1: 134. 2010. – Davallia friderici-et-pauli Christ, Verh. Naturf. Ges. Basel 11: 202. 1895. – Type: F. & P. Sarasin 760, Indonesia, Sulawesi, G. Matinang (isotype P).

Acrosorus triangularis Copel., Philipp. J. Sci., Sect. C, Botany 3: 347. 1909; Holttum, Rev. Fl. Malaya ed. 1, 2: 222, f. 122. 1955 [‘1954’]; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 62. 1967; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 53. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 597, f. 59.4–5. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 289. 2000. – Polypodium triangulare Scort. ex Bedd., J. Bot. 25: 324, t. 278, f. 1. 1887, nom. illeg. non Polypodium triangulare G.F.Gmel. (1791); Bedd., Suppl. Ferns Brit. Ind.: 87. 1892.

Description

Epiphytic. Rhizome short, suberect, bearing fronds in a tuft, usually also with old fronds, scaly; scales linear, up to 5 by 0.4 mm, brown or bright brown, with 3–6 rows of longitudinal cells, entire. Stipes indistinct or to 4 mm long, green to brown, winged to the very base, glabrous. Laminae linear, up to 5–20(–53) cm by 2–7(–9) mm, gradually narrowing towards both apex and base, deeply lobed almost to midrib; sterile lobes subtriangular, the acroscopic edges almost straight, nearly perpendicular to midrib, the basiscopic edges almost straight or slightly curved, forming about 45° to midrib, the apex moderately acute, 3–4 mm in both length and width; thinly leathery, glabrous or nearly so except on midrib, veins hardly visible, simple; fertile lobes at middle or apical portion of fronds, sometimes mixed with sterile ones, each bearing a sorus, circular to broadly elliptic in outline, deeply sunken in rimless pouches in the margin of the lamina, prominent on upper surface.

Distribution in Thailand

PENINSULAR: Surat Thani, Nakhon Si Thammarat, Yala.

Wider Distribution

Thailand, Vietnam, Peninsular Malaysia, Borneo, Philippines, Sulawesi and Maluku.

Ecology

On mossy tree trunks in dense evergreen forests on ridges or sometimes lithophytic .  At medium or high altitudes.

Proposed IUCN Conservation Assessment

Least Concern (LC). This species is widespread and not under any known threats.

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