Ophioglossum


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Ophioglossum

 

a genus of ferns of the family Ophioglossaceae, including mostly low herbs. Only a few tropical species are epiphytic, with the leaves reaching 2.7 m in length. The leaves are for the most part entire or lobed. The sporangia are sessile and open transversely. Some species reproduce vegetatively by means of adventitious buds formed on the roots. The prothallia (gametophytes) are usually cylindrical and subterranean; those developing aboveground contain chlorophyll. There are about 45 species, distributed in the tropical and, less commonly, temperate zones of both hemispheres. Of the three or four species found in the USSR, the most common is the adder’s-tongue (O. vulgatwn), which grows in moist meadows and amid shrubbery.

References in periodicals archive ?
Light and electron microscopy of a distinctive VA mycorrhiza in mature sporophytes of Ophioglossum reticulatum.
PS = 8.331 + 0.0161 RE [R.sup.2] = 56.2% [R.sup.2] adj = 54.6% Heliotropium ophioglossum
brachiatus, Ophioglossum engelmannii, Sporobolus vaginiflorus,
Members of Ophioglossales and Polypodiales belong to the division Polypodiophyta and are often called "true ferns." The order Ophioglossales in Alabama include the adder's-tongue ferns (Ophioglossum) and grapeferns (Botrychium).
Ophioglossum californicum, Psilotum nudum and Equisetum
En el presente trabajo se adicionan 5 nuevas familias que no habian sido reportadas anteriormente: Ophioglossaceae (Ophioglossum crotalophoroides), Montiaceae (Montia fontana y Montiopsis cuminghii), Polygalaceae (Monnina sp.), Tropaeolaceae (Tropaeolum tuberosum, en estado silvestre) y Vivianiaceae (Balbisia meyeniana).
This viewpoint is also accepted by Bower (1935) who regards Ophioglossum, with its reticulate venation, as a derived type.
Note: the 15 species of ferns and allies collected at Wilbur Wright Fish and Wildlife Area include Ophioglossum vulgatum L.
Ophioglossum engelmannii Prantl, Limestone Adder's-tongue.* S2S3