familyBlechnaceae
genusBlechnum
Show Lower Taxa
Difference between revisions of "Blechnum"
Sp. Pl. 2: 1077. 1753; Gen. Pl. ed. 5, 485, 1754.
Common names: Deer ferns
Etymology: Greek blechnon, an ancient name for ferns in general
Treatment appears in FNA Volume 2.
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>terrestrial or rarely on rock. <b>Stems</b> creeping to ascending or erect, slender to stout, sometimes climbing [rarely subarborescent]; scales brown or black. <b>Leaves</b> monomorphic or variously dimorphic, cespitose to scattered. <b>Blades</b> pinnatifid to 1-pinnate, rarely simple or 2-pinnate. <b>Rachis</b> and costae glabrous, scaly, or hairy abaxially. <b>Veins</b> free, often forked. <b>Sori</b> borne on vascular commissures parallel to costae, 1 per side, normally uninterrupted, linear, continuous along length of costa. <b>Spores</b> with perine smooth to variously winged or rugose. <b>x</b> = 28, 29, 31, 32, 34, 36.</span><!-- |
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Latest revision as of 20:25, 5 November 2020
Plants terrestrial or rarely on rock. Stems creeping to ascending or erect, slender to stout, sometimes climbing [rarely subarborescent]; scales brown or black. Leaves monomorphic or variously dimorphic, cespitose to scattered. Blades pinnatifid to 1-pinnate, rarely simple or 2-pinnate. Rachis and costae glabrous, scaly, or hairy abaxially. Veins free, often forked. Sori borne on vascular commissures parallel to costae, 1 per side, normally uninterrupted, linear, continuous along length of costa. Spores with perine smooth to variously winged or rugose. x = 28, 29, 31, 32, 34, 36.
Distribution
Mostly tropical, especially Southern Hemisphere.
Discussion
Species ca. 220 (3 in the flora).
Selected References
None.
Lower Taxa
Key
| 1 | Leaves strongly dimorphic, fertile leaves notably more erect, longer, and with narrower pinnae than sterile leaves; sterile blades tapering at base. | Blechnum spicant |
| 1 | Leaves ± monomorphic, fertile leaves only slightly longer and somewhat contracted relative to sterile leaves; sterile blades ± truncate at base. | > 2 |
| 2 | Blades 1-pinnate proximally and pinnatifid distally or pinnatifid nearly throughout, usually less than 50 cm; pinna margins ± entire. | Blechnum occidentale var. minor |
| 2 | Blades 1-pinnate throughout, usually more than 50 cm; pinna margins ± evenly serrulate. | Blechnum serrulatum |