Diplazium esculentum (Retz.) Sw.

Family

Athyriaceae

Nomenclature

Diplazium esculentum (Retz.) Sw., Schrad. J. Bot. 1801(2): 312. 1803; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 269. 1940; Tagawa & K.Iwats., SouthE. Asian Stud. 3(3): 88. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 106. 1967; Holttum, Dansk Bot. Ark. 23: 242. 1965; Tagawa & K.Iwats., Fl. Thailand 3: 466. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 153, 154, 192. 2000; Newman et al., Checkl. Vasc. Pl. Lao PDR: 33. 2007. – Hemionitis esculenta Retz., Obs. Bot. : 38. 1791. – Anisogonium esculentum (Retz.) C.Presl, Tent. Pterid.: 116. 1836; Bedd., Handb. Ferns Brit. India: 192, f. 94. 1883. – Athyrium esculentum (Retz.) Copel., Philipp. J. Sci., Sect. C, Botany 3: 295. 1908; Holttum, Rev. Fl. Malaya ed. 1, 2: 562 f. 333. 1955 [‘1954’].

Description

Rhizome erect, sometimes more than 1 m in height; scales up to 10 by 1.2 mm, dark brown, black-margined, toothed with Y-shaped teeth. Stipes about 70 cm long. Laminae variable in size, often more than 1 m long, bipinnate, or pinnate when young or small; lower 1 or 2 pinnae often reduced, larger pinnae up to 40 by 25 cm, rather suddenly narrowing towards acute apex; larger pinnules subsessile or shortly stalked, subcordate or auricled at base, narrowing towards acuminate apex, up to 13 by 2.5 cm, lobed to 1/4 way to costule; lobes rounded at apex, serrate, papyraceous; veins pinnate, veinlets up to 10 pairs, uniting with the opposite ones forming excurrent veinlets (seemingly goniopteroid venation). Sori on nearly the whole length of veinlets, often uniting with opposite ones.

Distribution in Thailand

NORTHERN: Mae Hong Son, Chiang Mai, Chiang Rai, Lampang, Tak; EASTERN: Chaiyaphum; SOUTH-WESTERN: Kanchanaburi, Phetchaburi; CENTRAL: Saraburi, Nakhon Nayok, Bangkok; SOUTH-EASTERN: Chon Buri; PENINSULAR: Surat Thani, Satun, Narathiwat.

Distribution in Laos

Vientiane.

Distribution in Cambodia

Mondulkiri, Ratanakiri.

Wider Distribution

Tropics of Asia, north to Central China and S Japan, east to S Pacific Islands.

Ecology

Usually on moist, level ground in paddy fields or along rivers in open places or at least in light shade at low or medium elevations less than 800 m alt.

IUCN Conservation Assessment

Least Concern (LC) as listed on the IUCN Red List at http://www.iucnredlist. org/apps/redlist/details/194150/0.

Notes

Young fronds locally consumed as a vegetable.  The Delacour specimen from Khammouane in Laos mentioned by Tardieu & Christensen (1940) is sterile but is probably a Cyathea .

Voucher specimens - Thailand

Hennipman 3315, Chiang Mai, Fang (P); Maxwell 92-804, Chiang Mai, Chiang Dao (P); Smith 2636, Surat Thani, Bandon (P).

Voucher specimens - Laos

Maxwell 99-211, Vientiane (CMU).

Voucher specimens - Cambodia

Long et al. CL404 & CL459, Mondulkiri (P); Matras 25, Ratanakiri (P).

Lower surface of lamina

Lower surface of lamina

Venation

Venation

Sori

Sori

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