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least halberd fern

incised halberd fern

Stems

horizontal, short-creeping.

erect, compact.

Petiole

straw-colored, 1–3 times length of blade, hairs absent abaxially, pubescent adaxially, base scaly;

scales lanceolate to linear, 1–3 × 0.3–0.5 mm.

straw-colored to tan or chestnut brown, equaling or slightly longer than blade, pubescent on both surfaces, base scaly;

scales narrowly lanceolate, 3–8 × 0.2–0.7 mm.

Blade

deltate to pentagonal, 1-pinnate or ternately lobed, 5–10 × 3–7 cm.

oblong or ovate-oblong, 1-pinnate, 0.15–1.2 × 0.2–0.5 m. Rachis and costae puberulent abaxially.

Pinnae

absent or 1(–2) pair, or blade shallowly pinnatifid, 4–7 cm, base rounded, without proliferous buds in axils.

(2–)3–6 pairs, 12–25 cm, base oblique, with 1–2 proximal basiscopic lobes, margins crenate without proliferous buds in axils.

Indusia

peltate.

attached laterally.

Rachis

and costae pubescent abaxially.

Areoles

rarely with included veinlets.

with included veinlets.

2n

= 80.

= 160.

Tectaria fimbriata

Tectaria incisa

Habitat Sinkholes, on shaded ledges or occasionally in sun Hammocks
Elevation 0 m (0 ft) 0 m (0 ft)
Distribution
from FNA
FL; Mexico in Yucatán; West Indies in Bahamas; Greater Antilles
[BONAP county map]
from FNA
FL; Mexico; Central America; West Indies in Antilles; South America to n Argentina
[BONAP county map]
Discussion

The hybrid between Tectaria fimbriata and T. coriandrifolia is T. × amesiana A. A. Eaton. Although intermediate between the two parents, the hybrid will lead to T. fimbriata in the key. The hybrid may be distinguished from T. fimbriata by scattered hairs on abaxial surface of petioles and misshapen spores.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 2. FNA vol. 2.
Parent taxa Dryopteridaceae > Tectaria Dryopteridaceae > Tectaria
Sibling taxa
T. coriandrifolia, T. heracleifolia, T. incisa
T. coriandrifolia, T. fimbriata, T. heracleifolia
Synonyms Aspidium fimbriatum, Aspidium minimum, Aspidium trifoliatum var. minimum, Sagenia lobata, T. lobata, T. minima
Name authority (Willdenow) Proctor & Lourteig: Bradea 5: 386. (1990) Cavanilles: Descr. Pl. 249. (1802)
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