Family

Hymenophyllaceae

Nomenclature

Didymoglossum motleyi (Bosch) Ebihara & K.Iwats., Blumea 51: 236. 2006. – Microgonium motleyi Bosch, Hymenophyll. Javan.: 5, t. 1. 1861; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 39. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 94. 1979. – Trichomanes motleyi (Bosch) Bosch, Ned. Kruidk. Arch. 5: 145. 1861; Bedd., Handb. Ferns Brit. India: 36. 1883; Copel., Philipp. J. Sci. 51: 201, pl. 30. 1933; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 61. 1939; Holttum, Rev. Fl. Malaya ed. 1, 2: 92, f. 30. 1955 [‘1954’]; Tagawa & K.Iwats., Fl. Thailand 3: 614. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 76. 2000.

Trichomanes nanum auct. non Bosch: Christ, Bot. Tidsskr. 24: 103. 1901.

Description

Rhizome creeping on base of tree, about 0.1 mm diam., densely hairy with short dark brownish hairs. Laminae almost sessile or on very short hairy stipes, simple, imbricate, circular or orbicular-oblong, the margin entire and plane, at most 4 mm in every direction; costae short, at most halfway to the apex of frond, without any branching; false veinlets many, simple or branched. Sori one on a frond, in a sinus at end of short main vein, deeply immersed; involucre tubular with dilated mouth, less than 1 mm long, 0.4 mm broad, the mouth up to 1 mm diam.

Distribution in Thailand

NORTHERN: Tak; SOUTH-WESTERN: Phetchaburi; PENINSULAR: Chumphon, Surat Thani, Phangnga, Phuket, Trang.

Wider Distribution

Peninsular Malaysia and Borneo.

Ecology

On basal part of tree trunks in dense primary forest at low altitudes.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 1764, Phetchaburi, Kaeng Krachan National Park (A).