Loxogramme involuta (D.Don) C.Presl
Loxogramme involuta (D.Don) C.Presl, Tent. Pterid.: 215. 1836; Bedd., Handb. Ferns Brit. India: 393, f. 228. 1883; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 464. 1941; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 56. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 577. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 278. 2000. – Grammitis involuta D.Don, Prodr. Fl. Nepal.: 14. 1825.
Rhizome short, ascending to creeping, about 1.5 mm diam., bearing a tuft of fronds near apex, densely covered with scales or dark on older portion; scales subdeltoid with acuminate apex, up to 7 by 4 mm, thin but stiff, entire, greyish brown, clathrate. Stipes indistinct, or very short with wings. Laminae caudately long-acuminate at apex, attenuate at base and decurrent to narrow wings of stipes nearly to the base, lanceolate, up to 35 by 4 cm, deep green on upper surface, paler beneath; midrib more or less raised beneath, usually flat on upper surface, stramineous or pale green; veins all obscure, anastomosing with free included veinlets; thick and fleshy, glabrous on both surfaces. Sori linear, to form angles of about 80° to midribs, continuous from near margin to near midrib, up to 3 cm long, about 1.5 mm broad, superficial .
Distribution in Thailand
NORTHERN: Chiang Mai, Tak; NORTH-EASTERN: Loei; EASTERN: Nakhon Ratchasima.
Distribution in Laos
India, Upper Burma and Indochina.
On mossy rocks or on mossy tree trunks in dense evergreen forests at 900–1800 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. 4951, Chiang Mai, Doi Pha Ti Do (E).
Lower surface of lamina and sori
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