Blechnum

Linnaeus

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.
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

Distribution values could not be resolved to valid regions

Mostly tropical, especially Southern Hemisphere.

Discussion

Species ca. 220 (3 in the flora).

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