Family

Lindsaeaceae

Nomenclature

Odontosoria krameri Fraser-Jenk., Taxon. Revis. Indian Subcontinental Pteridophytes 152. 2008. – Odontosoria chinensis var. divaricata Christ, J. Bot. II. 2: 23. 1909. – Sphenomeris chinensis var. divaricata (Christ) K.U.Kramer, Blumea 15: 572. 1968; Kramer, Fl. Males., Ser. II, Pterid. 1: 183, f. 1. 1971; Kramer, Gard. Bull. Singapore 26: 5. 1972; Tagawa & K.Iwats., Fl. Thailand 3: 148, f.10.1. 1985; Boonkerd & Pollawatn, Pterid. Thailand: 95. 2000; Newman et al., Checkl. Vasc. Pl. Lao PDR: 28. 2007.

Stenoloma chusana var. tenuifolia auct. non (Sw.) C.Chr.: Holttum, Rev. Fl. Malaya ed. 1, 2: 341, f. 198. 1955 [‘1954’].

Description

Rhizome short creeping, 2–4 mm diam.; scales reddish brown to castaneous, acicular, entirely uniseriate, or the base often biseriate, less often the extreme base tri- or quadriseriate, to 4 mm long. Fronds clustered. Laminae usually over 20 cm long, tripinnate or more throughout; segments cuneate, suddenly spathulate-broadened at the sorus, slightly narrowed at the rounded apex, the apical margin sometimes erose, the sides often corniculate; at the base often 0.5 mm wide, slightly broadened to the apex, 1–1.25 mm wide at the sorus, of varying length; sori sometimes two together in a segment, mostly uninerval, if binerval mostly on two connivent vein-ends; indusium even in binerval sori with distinctly convex base . Spores mostly 55–60 micrometres long.

Distribution in Thailand

NORTH-EASTERN: Loei; SOUTH-EASTERN: Chanthaburi.

Distribution in Laos

Unspecified.

Wider Distribution

E Himalayas, SW China, Burma, Indochina and Malesia.

Ecology

Lower montane forests at about 1500 m alt.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 4781, Kanchanaburi, Thong Pha Phum National Park (E).