Drynaria sparsisora (Desv.) T.Moore
Drynaria sparsisora (Desv.) T.Moore, Index Filic.: 348. 1862; C.Chr., Bot. Tidsskr. 32: 349. 1916; Holttum, Rev. Fl. Malaya ed. 1, 2: 183, f. 89. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 23: 231. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 3(3): 78. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 58. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 544. 1989; Hovenkamp & Roos, Fl. Males., Ser. II, Ferns and Fern Allies 3: 43. 1998; Boonkerd & Pollawatn, Pterid. Thailand: 25, 2701. 2000; Leti et al., Fl. Photogr. Cambodge 556. 2013. – Polypodium sparsisorum Desv., Berl. Mag. 5: 315. 1811.
Polypodium linnei Bory, Ann. Sci. Nat. 5: 464, t. 12. 1825. – Drynaria linnei (Bory) Bedd., Ferns Brit. India: t. 315. 1869; Handb. Ferns Brit. India: 343. 1883; Christ, Bot. Tidsskr. 24: 106. 1901.
Rhizome short creeping, 1–3 cm diam., densely covered with scales; scales oblong-ovate, acute at apex, round at base, peltate, toothed to fimbriate at margin, 1.5–3(–11) by 1–2.5 mm, bi-coloured with black brown central portion and brown margin, not so stiff. Nest leaves sessile, oval to ovate-oblong, 17–23 by 16–22 cm, lobed to a half-way between midrib and margin; lobes round at apex, entire, oblong-subdeltoid, up to 6 by 4 cm. Foliage leaves: stipes 12–18(–35) cm long, narrowly winged almost to the base; laminae pinnatifid, oblong, acute at apex, 40–50(–150) by (15–)25–35(–50) cm; lobes oblique, adnate to its neighbours with laminae of less than 1 cm in breadth, oblong-lanceolate, caudately acuminate at apex, entire, up to 20 by 5 cm; veins raised on both surfaces, copiously anastomosing, 6–8 rows of areoles between the main veins, no included free veinlets; coriaceous; pale green, glabrous. Sori round or punctiform, on veins, irregularly placed on the lower surface of lobes.
Distribution in Thailand
EASTERN: Chaiyaphum; SOUTH-WESTERN: Phetchaburi; SOUTH-EASTERN: Prachin Buri, Chanthaburi, Trat; PENINSULAR: Ranong, Phangnga, Phuket, Krabi, Trang, Satun, Narathiwat.
Distribution in Cambodia
Malesia and Polynesia to tropical Australia.
On tree trunks in dense evergreen forests or in light shade at low to medium altitudes.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
Voucher specimens - Cambodia
Viboth R5-43, Koh Kong, Thma Baing (P).
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