Ophioglossum costatum

Ophioglossum costatum R. Br. (Syn: Ophioglossum aphrodisiacum Welw. ex Hook.; Ophioglossum brevipes Bedd.; Ophioglossum bulbosum Bedd.; Ophioglossum felixii Tard.; Ophioglossum fibrosum Schum.; Ophioglossum pedunculosum Desv.; Ophioglossum wightii Hook. & Grev.);

Terrestrial herbs of about 10-20 cm long with a fleshy small, globose, subterranean rhizome, 1-2.5 x 1-2 cm, roots fleshy, slender. Fronds bipartite; sterile blade 10-12 x 2-2.7 cm, lanceolate, base cuneate, apex obtuse, entire, thick, fleshy, coriaceous, veins anastomosing; common stalk 3-6 cm long, 0.2-0.3 mm thick; fertile spike 3-6.5 cm long, arising from the base of the sterile blade, oblong, acute, flattened, fleshy with wavy margins, stalk 15-20 cm long. Sporangia globose, sunken, arranged in a row on either side of the stalk.
in grasslands of laterite hills, paddy fields, forest margins, etc.
India, Africa, Comores Archipelago, Malagasy, Sri Lanka, Sumatra to East Australia, New Zealand, Sumatra and Guinea coast; Kerala;
(Attributions- K. P. Rajesh from India Biodiversity Portal)               


Ophioglossum for Identification. : 5 posts by 3 authors. Attachments (3)
Please help me identifying the Ophioglossum sp. in attached images.
Date: 30th June 2016
Place: Takve, Maval, Maharashtra
Not sure if the images will be sufficient for confirming ID. I guess they are insufficient.
Would appreciate if someone could share an identification key.
Very close to Ophioglossum polyphyllum but can't confirm.
Thanks for sharing. I thought Ophioglossum always have solitary leaves.

This is Ophioglossum costatum which bears 1-5 tropophylls and each tropophyll thickish with prominent mid veins