Difference between revisions of "Blechnum occidentale var. minor"
Sp. Fil. 3: 51. 1860.
Common names: Hammock fern New World midsorus fern
Basionym: Blechnum glandulosum forma pubirachis (Rosenstock) Lellinger
Synonyms: Blechnum occidentale unknownBlechnum occidentale var. pubirachis Rosenstock
Treatment appears in FNA Volume 2.
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Stems </b>slender, creeping, elongate, branched, ascending to erect at tip, not climbing. <b>Leaves</b> ± monomorphic, cespitose to widely spaced, erect to arching, fertile leaves only slightly contracted and longer than sterile leaves. <b>Petiole</b> straw-colored to light brown, (4-)8-34 cm, coarsely scaly proximally. <b>Blade</b> narrowly to broadly lanceolate, 1-pinnate proximally, becoming pinnatifid distally, or pinnatifid throughout, without conform terminal pinna, 10-30 × 3-12 cm, base truncate, pubescent abaxially. <b>Rachis</b> with indument of spreading, ± gland-tipped hairs abaxially. <b>Pinnae</b> not articulate to rachis, proximal pinnae sessile to subsessile, distal pinnae adnate; larger pinnae curved, lanceolate, 2-7 × 0.5-1.5 cm. <b>Fertile</b> pinnae slightly contracted; margins minutely serrulate to nearly entire; costae with indument of hairs abaxially. <b>2n</b> = 124.</span><!-- |
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|publication year=1860 | |publication year=1860 | ||
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|genus=Blechnum | |genus=Blechnum | ||
|species=Blechnum occidentale | |species=Blechnum occidentale | ||
|variety=Blechnum occidentale var. minor | |variety=Blechnum occidentale var. minor | ||
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Revision as of 13:14, 27 July 2019
Stems slender, creeping, elongate, branched, ascending to erect at tip, not climbing. Leaves ± monomorphic, cespitose to widely spaced, erect to arching, fertile leaves only slightly contracted and longer than sterile leaves. Petiole straw-colored to light brown, (4-)8-34 cm, coarsely scaly proximally. Blade narrowly to broadly lanceolate, 1-pinnate proximally, becoming pinnatifid distally, or pinnatifid throughout, without conform terminal pinna, 10-30 × 3-12 cm, base truncate, pubescent abaxially. Rachis with indument of spreading, ± gland-tipped hairs abaxially. Pinnae not articulate to rachis, proximal pinnae sessile to subsessile, distal pinnae adnate; larger pinnae curved, lanceolate, 2-7 × 0.5-1.5 cm. Fertile pinnae slightly contracted; margins minutely serrulate to nearly entire; costae with indument of hairs abaxially. 2n = 124.
Habitat: Rocky and clayey places near seasonally dry streams, shady hammocks or open woods, over limestone, soil nearly neutral
Elevation: 0 m
Distribution
Fla., Ga., La., Tex., West Indies, Central America, South America to Bolivia.
Discussion
Blechnum occidentale var. minor differs from var. occidentale in having rachises slightly pubescent or puberulous abaxially. Both varieties are found throughout the New World tropics; B. occidentale var. minor grows at higher elevations (D. B. Lellinger 1985). The nomenclature of these taxa is complicated, and other names may apply. Systematic problems involving different ploidy levels and apparent geographic clines in Blechnum occidentale sensu lato remain to be solved.
Plants of Blechnum occidentale often reproduce extensively by stolons as well as by spores.
Selected References
None.
Lower Taxa
None.