Ophioglossum gramineum Willd.




Ophioglossum gramineum Willd., Nov. Acad. Erf. 2: 18, t. 1, f. 1. 1802; Wieffer., Blumea 12: 324. 1964; Tagawa & K.Iwats., Fl. Thailand 3: 36. 1979; Boonkerd & Pollawatn, Pterid. Thailand: 65. 2000.

Ophioglossum parvifolium auct. non Grev. & Hook.: Tardieu & C.Chr., Fl. Indo-Chine 7(2): 6. 1939.


Rhizome subglobose, bearing several fleshy roots and 1–2 (for Thai plants, up to10 for foreign ones) fronds simultaneously. Fronds 6–8 cm long; phyllomophore 1–3 cm long; trophophyll linear-lanceolate, acute at apex, narrowly cuneate at sessile base, 1.2–2.2 cm long, to 2.5 mm broad, costules not distinct; veins reticulate forming very long-stretched areoles without included veinlets; texture papyraceous; sporophyll simple , with stalks 2–4 cm long; spikes 1–1.2 cm long.

Distribution in Thailand

CENTRAL: Saraburi; PENINSULAR: Ranong.

Distribution in Cambodia


Wider Distribution

Probably pantropical.


Open, wet, bare rock surface with about 2 cm of wet substrate in deciduous forest.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Larsen et al. 43136, Ranong, Bang Ben Nat. Park (P).

Voucher specimens - Cambodia

Pierre s.n., Cambodia (P).

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