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.
T + Botrychium virginianum T + Botrychium virginianum T + Botrychium virginianum T + Botrychium virginianum T + Botrychium virginianum T + Ophioglossum reticulatum L.
Botrychium lunarioides is often associated with another inconspicuous family member, Ophioglossum crotalophoroides (bulbous adder's-tongue).
OPHIOGLOSSUM {oh-fee-oh-GLOSS-um} Linnaeus 1753 * Adder's-tongue Ferns * (Greek ophis, snake, and glossa, tongue, referring to the sporulating portion of the fertile rachis.
Complete plastid genomes from Ophioglossum californicum, Psilotum nudum, and Equisetum hyemale reveal an ancestral land plant genome structure and resolve the position of Equisetales among monilophytes.
Species found only at Botany Glen and not at other documented studies from the region include Ophioglossum vulgatum, Heracleum lanatum, Triosteum perfoliatum, Trillium grandiflorum, Stylophorum diphyllum, Chelone oblique, and Viola palmata
Progressing distally from the root, Psilophyton crenulatum, the most basal clade, comprises the psilotophytes Psilotum + Tmesipteris, followed by the equisetophyte Equisetum, the seed plant Pinus, the ophioglossalean ferns Ophioglossum + Botrychium, the marattiaceous ferns Marattia + Angiopteris, and the "leptosporangiate" clade that consists of the Filicales + the Hydropteridales [ILLUSTRATION FOR FIGURE 4 OMITTED].
Contribucion al conocimiento sobre el genero Ophioglossum L.
1980; Gunning, 1981; Kurth & Gifford, 1985), Asplenium (Gifford, 1991), Osmunda (Freeberg & Gifford, 1984), and Ophioglossum (Peterson & Brisson, 1977).
La identificacion inicial del pliego que sirvio como base para dicha indicacion fue rectificada con posterioridad por el propio autor de la revision (como Ophioglossum azoricum K.
Microtubular cytoskeleton and organelles during sporogenesis of the homosporous fern Ophioglossum vulgatum.