Family

Hymenophyllaceae

Nomenclature

Abrodictyum idoneum (C.V.Morton) Ebihara & K.Iwats., Blumea 51(2): 243. 2006. – Trichomanes idoneum C.V.Morton, Contr. U.S. Natl. Herb. 38: 272. 1973. – Trichomanes bifidum C.Presl, Hymenophyllaceae: 43. 1843, non Willd. 1810.

Trichomanes gemmatum auct. non J.Sm. ex Baker: Bedd., Suppl. Ferns Brit. Ind.: 10. 1892; Copel., Philipp. J. Sci. 51: 269, pl. 61, f. 2. 1933; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 69. 1939; Holttum, Rev. Fl. Malaya ed. 1, 2: 104, f. 40. 1955 ['1954']. – Macroglena gemmata auct. non (J.Sm. ex Baker) Copel.: Copel, Philipp. J. Sci. 67: 84. 1938; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 43. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 98. 1979. – Cephalomanes gemmatum auct. non (J.Sm. ex Baker) K.Iwats.: Tagawa & K.Iwats., Fl. Thailand 3: 615. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 26, 67. 2000.

Description

Terrestrial. Fronds to 18 cm long, 7 cm wide, very finely dissected, rachis and stipes very narrowly winged; pinnae overlapping but their branches lying almost all in one plane; ultimate segments winged with a lamina 2–4 cells wide. Sori c. 1.5 mm long, narrowly conical, hardly winged, apex truncate, receptacle slightly protruding when old.

Distribution in Thailand

PENINSULAR: Nakhon Si Thammarat.

Wider Distribution

Peninsular Malaysia and Borneo.

Ecology

On moist clayey slope in dense forest at high altitudes.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Laos

Poilane 2423, Xieng Khouang (P).

Voucher specimens - Cambodia

Poilane 2423, Xieng Khouang (P).