Nephrolepis acutifolia (Desv.) Christ
Nephrolepis acutifolia (Desv.) Christ, Verh. Naturf. Ges. Basel 11: 243. 1895; E.Smith, J. Siam Soc. Nat. Hist. Suppl. 8: 5. 1929; Holttum, Rev. Fl. Malaya ed. 1, 2: 375, t. 218. 1955 [‘1954’]; Tagawa & K.Iwats., Fl. Thailand 3: 171. 1985; Boonkerd & Pollawatn, Pterid. Thailand: 237. 2000; Hovenkamp & Miyamoto, Blumea 50: 289. 2005. – Lindsaea acutifolia Desv., Mém. Soc. Linn. Paris 6(3): 312. 1827.
Isoloma lanuginosa J.Sm. in Hook. & Bauer, Gen. Fil. (Hooker): t. 102. 1842. – Lindsaea lanuginosa (J.Sm.) Hook., Sp. Fil. 1: 210, t. 69A. 1846; Bedd., Handb. Ferns Brit. India: 77. 1883.
Rhizome erect with long creeping and branching stolons. Tubers absent. Stipe about 10 cm long, scaly; scales appressed, up to 20 by 0.5 mm, gradually narrowing from base to apex, irregular at basal margin, otherwise entire, dark brown. Laminae linear-lanceolate, about 75 by 15 cm, pinnate; lateral pinnae more than 50 pairs, 1–2 cm apart; middle ones the largest, narrowly lanceolate, gradually narrowing towards acute apex, truncate or subcordate at base, sessile, more or less falcate, up to 8 by 1 cm in fertile ones, 1.3 cm broad in sterile ones, entire; chartaceous; veins hardly visible, forked near costa, all free. Sori marginal, continuous or rarely interrupted in apical region; indusia about 1 mm in breadth, forming lindsaeoid grooves for sporangia with margin of pinna, brown, thin but stiff, glabrous .
Distribution in Thailand
EASTERN: Nakhon Ratchasima; SOUTH-EASTERN: Prachin Buri, Chon Buri, Chanthaburi; PENINSULAR: Surat Thani, Phangnga, Nakhon Si Thammarat.
Old World tropics generally from Africa through SE Asia to Polynesia.
In light shade at low altitudes.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
At the end of veinlets on upper surface of frond are distinct hydathodes on which the excretions sometimes persist and form a continuous line of white dots along the margin of fronds. These are usually wrongly described as white scales covering the hydathodes.
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