Family

Dryopteridaceae

Nomenclature

Bolbitis sinuata (C.Presl) Hennipman, Blumea 18: 148. 1970; Hennipman, Leiden Bot. Ser. 2: 232, f. 61 & 62. 1977; Hennipman, Fl. Males., Ser. II, Pterid. 1: 326, f. 27j. 1978; Tagawa & K.Iwats., Fl. Thailand 3: 321. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 184. 2000. – Polypodium sinuatum C.Presl, Reliq. Haenk. 1: 21. 1825.

Acrostichum diversifolium Blume, Enum. Pl. Javae: 103. 1828. – Bolbitis diversifolia (Blume) Schott, Gen. Fil.: ad. t. 13. 1835; Holttum, Rev. Fl. Malaya ed. 1, 2: 465, f. 273. 1955 [‘1954’]; Tagawa & K.Iwats., SouthE. Asian Stud. 3(3): 85. 1965.

Description

Lithophytic. Rhizome creeping, ascending, scaly; scales greyish-brown, clathrate, sometimes with a narrow paler non-clathrate margin, rather stiff, lanceolate, up to 4 by 1 mm. Sterile frond simple or tri- to quinque-foliate; stipe stramineous or darker, 3–19 cm long, sparsely scaly; simple laminae or terminal pinnae broadly oblanceolate, acuminate, at apex, gradually narrowing towards base, 15–30 by 5–7.5 cm, subentire at margin, often a bulbil on midrib near the apex of terminal pinna; midrib scaly beneath; main veins distinct but other veins obscure on both surfaces, reticulate without included veinlets, areoles irregular, many; thickly papyraceous, glabrous. Fertile frond nearly the same height as sterile ones; stipe 15–25 cm long; lamina simple or imparipinnate with 2–3 lateral pinnae and a large terminal pinna; lateral pinnae lanceolate, gradually narrowing towards both ends, sessile, up to 6 by 0.7 cm, terminal or simple pinna lanceolate, about 12 by 2 cm, veins reticulate, obscure .

Distribution in Thailand

PENINSULAR: Ranong, Nakhon Si Thammarat, Trang, Satun, Yala.

Wider Distribution

Peninsular Malaysia, Sumatra, eastwards to the Philippines.

Ecology

On wet mossy rocks by streams in dense evergreen forests at low altitude.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 5343, Satun, Thale Ban National Park (E); Middleton et al. 5499, Songkhla, Khao Nam Khang National Park (E).