Family

Pteridaceae, subfamily Vittarioideae

Nomenclature

Adiantum capillus-junonis Rupr., Dist. Crypt. Vasc. Ross. 49. 1845; Boonkerd & Pollwatn, ScienceAsia 37: 370–372. 2011.

Description

Description from Boonkerd & Pollwatn, ScienceAsia 37: 370–372. 2011.

Rhizomes short erect; covered with brown lanceolate scales, the scales 4–5.4 mm long, margin glabrous. Stipes 3.4–8.7 cm long, 0.12–0.54 mm in diam., deep-castaneous and polished, scales like those on rhizome, smooth upwards. Laminae simply pinnate, oblong-lanceolate, 3.5–13 by 3.5–5.5 cm; pinnae stipitate, 1–3 pairs, lateral pinnae opposite or subopposite; stalks 0.1–0.5 cm, articulated to pinnae at base of pinnae, persistent; lower pairs of pinnae 1.2–2.1 by 1.5–2.5 cm; pinnae circular to obtriangular, base broad cuneate to rounded, basal edges entire, upper margins rounded; fertile pinnae with 2–5 shallow sinuses, slightly denticulate to entire on sterile parts; sterile pinnae slightly denticulate to entire on upper margins; upper pinnae and terminal pinnae similar; softly herbaceous or membranous, glabrous on both surfaces; veins dichotomous, prominent on both sides. Sori 2–5, at margin of pinnae, reflexed soral flaps oblong to reniform, about 1.2 mm broad, up to 3 mm long. Sporangia on short stalk, 1/3 as long as the capsule; capsule ca. 350 micrometres by 275 micrometres, with 28–30 indurated annulus cells. Spores trilete , mostly 56–62 micrometres diam.

Distribution in Thailand

NORTH-EASTERN: Phetchabun, Loei.

Wider Distribution

Japan, China, Taiwan, Thailand.

Ecology

On wet limestone rock walls in semishade, 600–900 m.

Similar species

Adiantum erylliae C.Chr. & Tardieu

Proposed IUCN Conservation Assessment

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