Family

Polypodiaceae

Nomenclature

Aglaomorpha coronans (Wall. ex Mett.) Copel., Univ. Calif. Publ. Bot. 16: 117. 1929; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 488, f. 57.3 & 57.4. 1941; Holttum, Dansk Bot. Ark. 20: 21. 1961; Tagawa, J. Jap. Bot. 38: 328. 1963; Tagawa & K.Iwats., SouthE Asian Stud. 5: 57. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 551, f. 55.4 & 55.5. 1989; Hovenkamp & Roos, Fl. Males., Ser. II, Ferns and Fern Allies 3: 15. 1998; Boonkerd & Pollawatn, Pterid. Thailand: 245, 262. 2000; Newman et al., Checkl. Vasc. Pl. Lao PDR: 29. 2007. – Polypodium coronans Wall. ex Mett., Abh. Senck. Naturf. Ges. 2: 121, t. 3, f. 40 & 41. 1857; Hosseus, Beih. Bot. Centralbl. 28(2): 366. 1911. – Drynaria coronans (Wall. ex Mett.) J.Sm., J. Bot. 4: 61. 1841; Bedd., Handb. Ferns Brit. India: 338. 1883. – Pseudodrynaria coronans (Wall. ex Mett.) Ching, Sunyatsenia 5: 262. 1940; Holttum, Dansk Bot. Ark. 23: 231. 1965. – Pleopeltis coronans (Wall. ex Mett.) Alderw., Bull. Dép. Agric. Indes Néerl. 27: 11. 1909. – Type: Wallich 288 (B; iso BM, BR, G, GH, K, L, P, US, W), Nepal.

Polypodium conjugatum Baker, Syn. Fil.: 366. 1868. – Drynaria conjugata (Baker) Bedd., Ferns Brit. India correct . 1870.

Description

Epiphytic or lithophytic. Rhizome creeping, thick, 1.5–3 cm diam., densely scaly throughout; scales pseudopeltate, brown, linear, (5–)10–15(–20) by 0.5–1 mm, sharply toothed at margin. Fronds sessile, 70–170 by 20–45(–60) cm, lobed almost to rachis, lobes continuing with wings less than 1 cm broad, the base of laminae broadly rounded to cordate, up to 15 cm broad, subentire or shallowly lobed, brown, like the nest leaves of Drynaria; lobes of the upper part of laminae ascending, usually more than a dozen pairs, linear-subtriangular, attenuately acuminate at apex, entire at margin, 15–40 by 1.5–5 cm, every lobe falling at the abscission along rachis; veins raised on both surfaces, venation drynarioid, or reticulate, main areoles quadrangular, smaller areoles with free included veinlets; coriaceous, green, glabrous. Sori one, or very rarely two, row(s) between main veins, more or less elongate, or sometimes uniting longitudinally, but rarely continuous beyond cross veins.

Distribution in Thailand

NORTHERN: Chiang Mai, Chiang Rai, Lampang, Phrae, Tak, Phitsanulok; NORTH-EASTERN: Loei; EASTERN: Chaiyaphum; SOUTH-WESTERN: Kanchanaburi; SOUTH-EASTERN: Prachin Buri, Chanthaburi; PENINSULAR: Surat Thani, Nakhon Si Thammarat, Trang, Phangnga.

Distribution in Laos

Champasak, Khammouane, Salavan.

Distribution in Cambodia

Kampot

Wider Distribution

Himalayas to S China, Indochina, Taiwan and northwards to the Ryukyus; Khao Chong is the southernmost record of this species .

Ecology

On rather dry or mossy rocks or on tree trunks in open places or in dense forests, not so rare at medium altitudes throughout Thailand.

Proposed IUCN Conservation Assessment

Least Concern (LC). This species is common and widespread.

Voucher specimens - Thailand

Middleton et al. 4707, Chanthaburi, Khao Soi Dao Wildlife Sanctuary (E).

Voucher specimens - Laos

Newman et al. LAO 170, Khammouan (CMU, E).