Sticherus truncatus (Willd.) Nakai
Sticherus truncatus (Willd.) Nakai, Bull. Natl. Sci. Mus. 29: 20. 1950. – Gleichenia truncata (Willd.) Spreng., Syst. Veg. 4: 25. 1827; Holttum, Fl. Males., Ser. II, Pterid. 1: 20, f. 7a–b & 9. 1959; Tagawa & K.Iwats., Fl. Thailand 3: 53. 1979; Boonkerd & Pollawatn, Pterid. Thailand: 81. 2000. – Mertensia truncata Willd., Kongl. Vetensk. Acad. Nya Handl. 25: 169, t. 5, f. A. 1804.
Mertensia laevigata Willd., Sp. Pl. ed. 4, 5(1–2): 75. 1810. – Gleichenia laevigata (Willd.) Hook., Sp. Fil. 1: 10. 1844; Christ, Bat. Tidsskr. 24: 112. 1901; C.Chr., Bot. Tidsskr. 32: 349. 1916; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 51. 1939; Holttum, Rev. Fl. Malaya ed. 1, 2: 71. 1955 [‘1954’].
Terrestrial. Rhizome dichotomously branched, near the apex protected by peltate scales. Fronds of mature plants usually with indefinite growth in length, bearing primary branches in pairs. Main rachis high-climbing; resting buds covered with brown, short-fringed scales; stipular leaflets at base of primary branch and at its first fork, deltoid, deeply lobed or the basal lobes again lobed, up to 2.7 cm long; rachis branches repeatedly forked, all branches, except the basal segments, leafy throughout, each branch 7.5–12 cm long; lobes patent, adnate at base, hardly decurrent to the next ones, usually irregular in length even on the same branch, up to 3.5 cm long, 2 mm broad, the margin entire, revolute, not glaucous beneath; veins free. Sori exindusiate, with 3–5 sporangia, surrounded by stellate hairs, medial .
Distribution in Thailand
Distribution in Cambodia
Vietnam and throughout Malesia.
Climbing ferns growing on stream banks at about 50–600 m alt.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread outside of Thailand and not under any known threat.
The record for this species in Laos in Fl. Indo-Chine would appear to be a mistake as Blao is in Vietnam, not Laos.
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