Bolbitis costata (C.Presl) Ching ex C.Chr.
Bolbitis costata (C.Presl) Ching ex C.Chr., Index Filic. Suppl. III.: 47. 1934; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 91. 1967; Hennipman, Leiden Bot. Ser. 2: 155, f. 41. 1977; Tagawa & K.Iwats., Fl. Thailand 3: 311. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 182. 2000. – Campium costatum C.Presl, Tent. Pterid.: 238, pl. X23. 1836; C.Chr., Contr. U.S. Natl. Herb. 26: 331. 1931. – Gymnopteris costata (C.Presl) Bedd., Suppl. Ferns Brit. Ind.: 27. 1876; Bedd., Handb. Ferns Brit. India: 438, f. 266. 1883.
Terrestrial. Rhizome thick, scaly. Sterile frond: stipe stramineous, about 60 cm long, densely scaly with light brown appressed membranous oblong-ovate scales; lamina oblong-lanceolate, about 65 by 28 cm; rachis minutely scaly; lateral pinnae 8 pairs, oblong-lanceolate, caudate at apex, round to cuneate at base, subentire, up to 20 by 4 cm, shortly stalked, ascending and straight or slightly falcate, little reduced towards both ends; terminal pinna longer, 23 by 3.8 cm, cuneate at base, viviparous near apex; costa sparsely scaly beneath; veins raised on lower surface, main veins 3–5 mm apart, more than one row of areoles between main veins, a few veinlets included; coriaceous, green but reddish when dried. Fertile frond: stipe about 60 cm long, scaly; lamina 30 by 12 cm; lateral pinnae 6 pairs, linear with round apex, shortly stalked, up to 80 by 8 mm; terminal pinna like the lateral ones, a little longer; sporangia dispersed on the whole under surface of pinnae .
Distribution in Thailand
NORTHERN: Chiang Mai, Lampang.
On rather dry slopes in mountain forests at 600–1000 m alt.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threats.
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