Drynaria sparsisora (Desv.) T.Moore

Family

Polypodiaceae

Nomenclature

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.

Description

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

Koh Kong.

Wider Distribution

Malesia and Polynesia to tropical Australia.

Ecology

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).

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.