Selliguea heterocarpa (Blume) Blume

Family

Polypodiaceae

Nomenclature

Selliguea heterocarpa (Blume) Blume, Enum. Pl. Javae Addenda. 1828; Blume, Fl. Javae Fil.: 125, t. 52, f. 1. 1829; Holttum, Rev. Fl. Malaya ed. 1, 2: 157, f. 69. 1955 [‘1954’]; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 53. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 563, f. 56.10–11. 1989; Hovenkamp, Fl. Males., Ser. II, Ferns and Fern Allies 3: 209. 1998; Boonkerd & Pollawatn, Pterid. Thailand: 261, 289. 2000. – Grammitis heterocarpa Blume, Enum. Pl. Javae 118. 1828. – Type: Reinwardt s.n. (L), Java.

Description

Rhizome short creeping, 2–4 mm diam., densely scaly throughout; scales peltate, oblong-subtriangular with very long tail, pale brown, concolourous, not clathrate, 5–8 by 1–1.4 mm, fimbriate at basal margin, toothed at basal lateral margin. Fronds dimorphic. Stipes 2–12(–28) cm long, fertile fronds usually taller, stramineous, scaly at base. Laminae simple, often drying reddish, oblong to oblong-lanceolate or ovate, entire, gradually narrowing towards acuminate apex, tapering at base, broadest at about basal 1/4 way, 12–18(–52) by 0.6–3.5(–4.8) cm in fertile and 23–37 by 0.8–6.3(–8.5) cm in sterile ones; leathery, light green, more or less reddish in dried specimens; midrib and lateral main veins distinct, the other veins hardly visible, anastomosing with included free veinlets. Sori linear, in one row between adjacent lateral main veins, continuous or more or less interrupted (in which case circular or oblong), immersed to some extent and raised on upper surface.

Distribution in Thailand

PENINSULAR: Surat Thani, Phangnga, Nakhon Si Thammarat, Satun, Songkhla, Yala.

Wider Distribution

Indochina, Peninsular Malaysia, Sumatra, Java, Borneo, and the Philippines.

Ecology

On rocks or on tree trunks usually by streams in not so dense evergreen forests at low altitudes.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 5331, Songkhla, Ton Nga Chang Wildlife Sanctuary (E).

Habit

Habit

Rhizome

Rhizome

Upper surface of lamina

Upper surface of lamina

Lower surface of frond with linear sori

Lower surface of frond with linear sori

Lower surface of frond with round sori

Lower surface of frond with round sori

Sori

Sori

Variation in sorus shape

Variation in sorus shape

Site hosted by the Royal Botanic Garden Edinburgh. Content managed by Stuart Lindsay, Gardens by the Bay, Singapore and David Middleton, Singapore Botanic Gardens. Last updated 16 November 2016.