Davallia denticulata (Burm.f.) Mett. ex Kuhn

Family

Davalliaceae

Nomenclature

Davallia denticulata (Burm.f.) Mett. ex Kuhn, Filic. Decken.: 27. 1867; C.Chr., Bot. Tidsskr. 32: 345. 1916; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 107. 1939; Holttum, Rev. Fl. Malaya ed. 1, 2: 359, f. 206. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 23: 234. 1965; Seidenf., Nat. Hist. Bull. Siam Soc., 19: 86. 1958; Ching, Fl. Reipubl. Popularis Sin. 2: 298. 1959; Tagawa & K.Iwats., SouthE. Asian Stud. 3(3): 82. 1965; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 54. 1968; T.Sen, U.Sen & Holttum, Kew Bull. 27: 219. 1972; Tagawa & K.Iwats., Fl. Thailand 3: 160. 1985; Nooteboom, Fl. Males., Ser. II, Ferns and Fern Allies 3: 250. 1998; Boonkerd & Pollawatn, Pterid. Thailand: 233. 2000; Newman et al., Checkl. Vasc. Pl. Lao PDR: 26. 2007. – Adiantum denticulatum Burm.f., Fl. Ind.: 236. 1768. – Wibelia denticulata (Burm.f.) M.Kato & Tsutsumi, Acta Phytotax. Geobot. 59(1): 13. 2008. – Type: Pryon s.n., Java.

Davallia elegans Sw., Schrad. J. Bot. 1800(2): 87. 1801; Bedd., Handb. Ferns Brit. India: 59. 1883; Christ, Bot Tidsskr. 24: 110. 1901; Hosseus, Beih. Bot. Centralbl. 28(2): 364. 1911.

Description

Rhizome long creeping, about 5 mm diam., densely scaly throughout; scales ovate at base and abruptly narrowing to long, patent tails, the base up to 1.5 mm wide and long, more or less appressed, the tails up to 5 by 0.2 mm brown to dark brown, minutely toothed at margin. Stipes brown, terete, up to 40(–50) cm long, glabrous. Laminae subtriangular, gradually narrowing towards acuminate apex, quadripinnatifid to quadripinnate, up to 60(–90) by 50 cm; all pinnae anadromous; basal pinna subtriangular, broadly cuneate at base, stalked, up to 35 cm long, 30 cm wide; pinnules and secondary pinnules stalked or upper smaller ones subsessile, oblong to oblong-subdeltoid, moderately acute to acuminate, ultimate segments (3rd pinnules) oblong, oblique, round at apex, narrowly cuneate and decurrent at base, lobed at margin; lobes acute, about 0.4 mm broad, thin but fairly stiff, green; veins distinct on the lower surface; false veinlets present but not always clearly visible. Sori small, placed at very margin of lobes; indusia cup-shaped, up to 0.7 by 0.4 mm, variable in size and form .

Distribution in Thailand

NORTH-EASTERN: Loei; EASTERN: Nakhon Ratchasima, Ubon Ratchathani; SOUTH-WESTERN: Kanchanaburi, Prachuap Khiri Khan; CENTRAL: Nakhon Nayok; SOUTH-EASTERN: Chon Buri, Trat; PENINSULAR: Ranong, Surat Thani, Phangnga, Krabi, Nakhon Si Thammarat, Trang, Satun, Yala, Narathiwat.

Distribution in Laos

Champasak.

Distribution in Cambodia

Pursat

Wider Distribution

Widely distnibuted in the tropics of the Old World, Madagascar to Polynesia and Australia, north to Laos, Hainan and Guangdong.

Ecology

On dry rocks or on tree trunks in evergreen forests or half-shaded places at altitudes below 200 m, or rarely 500 m.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 5193, Ubon Ratchathani, Phu Chong Nayoi National Park (E).

Voucher specimens - Laos

Maxwell 97-1146, Champasak (CMU)

Voucher specimens - Cambodia

Godefroy 377, Pursat (P).

Habit

Habit

Habit

Habit

Habit

Habit

Rhizome

Rhizome

Growing tip of rhizome

Growing tip of rhizome

Frond apex

Frond apex

Upper surface of lamina

Upper surface of lamina

Pinna

Pinna

Lower surface of lamina

Lower surface of lamina

Lower surface of lamina

Lower surface of lamina

Sori

Sori

Mature sori

Mature sori

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