Diplopterygium blotianum (C.Chr.) Nakai

Family

Gleicheniaceae

Nomenclature

Diplopterygium blotianum (C.Chr.) Nakai, Bull. Natl. Sci. Mus. 29: 49. 1950. – Gleichenia blotiana C.Chr., Bull. Mus. Natl. Hist. Nat., Ser. 2, 6: 103. 1934; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 48, f. 7.1. 1939; Holttum, Fl. Males., Ser. II, Pterid. 1: 17. 1959; Holttum, Rev. Fl. Malaya, ed. 2, 2: 630. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 52, f. 4.4–4.9. 1979; Boonkerd & Pollawatn, Pterid. Thailand: 80. 2000. – Hicriopteris blotiana (C.Chr.) Ching, Sunyatsenia 5: 279. 1940; Fl. Reipubl. Popularis Sin. 2: 124. 1959.

Gleichenia norrisii auct. non Mett. ex Kuhn: Tagawa & K.Iwats., SouthE. Asian Stud. 5: 35. 1967, p.p.

Description

Description from Holttum, Fl. Males., Ser. II, Pterid. 1: 17. 1959.
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. Scales on dormant apex of rachis nearly black, edges bearing oblique black setae; scales on growing main rachis usually with a paler median band; rachis-branches when young bearing many dark stellate hairs with rigid rays (so close that hairs touch each other but do not completely obscure surface of rachis) and also very narrow ciliate scales 2 mm long and some long lax multicellular hairs; a similar indumentum on upper surface of costae at first, later deciduous; indumentum on lower surface of costae and costules mostly of dark rigid stellate hairs, with a few scales at bases of costae; dark stellate hairs scattered abundantly on veins and lamina beneath, persistent. Main rachis-branches c. 150 cm long, the lowest pinnules stipule-like, 3.5 cm long, deltoid, with very narrow deeply pinnatifid basal lobes; pinnules commonly 20 cm long, 3–4 cm wide, the base of the costa distinctly deflexed; costae 4–5 cm apart, costules c. 5 mm apart; segments of lamina 3.5–4 mm wide, rather thin, their apices broadly rounded and sometimes retuse; veins distinctly raised on upper surface and slightly so below; sporangia 3–4 in each sorus .

Distribution in Thailand

NORTH-EASTERN: Loei; PENINSULAR: Nakhon Si Thammarat.

Distribution in Laos

Xieng Khouang.

Distribution in Cambodia

Kampot

Wider Distribution

South China to Taiwan, Indochina and Peninsular Malaysia.

Ecology

Along streams in dense evergreen forest at about 1200 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. 5122, Loei, Phu Suan Sai National Park (E); Middleton et al. 5502, Nakhon Si Thammarat, Khao Ram Rom (E).

Habit

Habit

Rhizome

Rhizome

Scales on rhizome

Scales on rhizome

Cross section through rhizome

Cross section through rhizome

Cross section through stipe

Cross section through stipe

Crozier

Crozier

Unfurling frond

Unfurling frond

Node within frond with stipule-like leaflets

Node within frond with stipule-like leaflets

Node within frond with stipule-like leaflets

Node within frond with stipule-like leaflets

Upper surface of lamina

Upper surface of lamina

Lower surface of lamina

Lower surface of lamina

Sori

Sori

Site hosted by the Royal Botanic Garden Edinburgh. Content managed by Stuart Lindsay, Gardens by the Bay, Singapore and David Middleton, Singapore Botanic Gardens. Last updated 16 November 2016.