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doradille chevelue, maidenhair spleenwort


not proliferous.


short-creeping, often branched;

scales black throughout or with brown borders, lanceolate, 2–5 × 0.2–0.5 mm, margins entire to denticulate.




reddish brown or blackish brown throughout, lustrous, 1–4(–7) cm, 1/6–1/4 length of blade;

indument absent or of black, linear-lanceolate or filiform scales at base.


linear, 1-pinnate, 3–22 × 0.5–1.5 cm, thin, glabrous or sparsely pubescent;

base gradually tapered;

apex narrowly acute, not rooting.


in 15–35 pairs, oblong to oval;

medial pinnae 2.5–8 × 2.5–4 mm;

base broadly cuneate, with or without low, rounded acroscopic auricle;

margins shallowly crenate to serrate or ± entire;

apex obtuse.


free, evident.


2–4 pairs per pinna, on both basiscopic and acroscopic sides.


64 per sporangium.


reddish brown throughout, lustrous, glabrous or nearly so.


= 72, 144.

Asplenium trichomanes

from FNA
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In North America, as in Europe, Asplenium trichomanes consists of diploid and tetraploid cytotypes, treated here as subspecies. Asplenium trichomanes subsp. trichomanes, the diploid, is found on noncalcareous rocks. In the southwestern United States it occurs at high elevations. Asplenium trichomanes subsp. quadrivalens, the tetraploid, grows on calcareous substrates and has a more northern distribution (R. C. Moran 1982). Triploid hybrids are known between the diploids and tetraploids (R. C. Moran 1982; W. H. Wagner Jr. and F. S. Wagner 1966).

Subspecies 4 (2 in the flora).

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

1. Spores 27-32 µm; on acidic substrates.
subsp. trichomanes
1. Spores 37-43 µm; on limestone.
subsp. quadrivalens
Source FNA vol. 2.
Parent taxa Aspleniaceae > Asplenium
Sibling taxa
A. abscissum, A. adiantum-nigrum, A. adulterinum, A. auritum, A. bradleyi, A. cristatum, A. dalhousiae, A. ebenoides, A. exiguum, A. heterochroum, A. monanthes, A. montanum, A. palmeri, A. pinnatifidum, A. platyneuron, A. plenum, A. pumilum, A. resiliens, A. rhizophyllum, A. ruta-muraria, A. scolopendrium, A. septentrionale, A. serratum, A. trichomanes-dentatum, A. trichomanes-ramosum, A. verecundum, A. vespertinum, A. ×biscayneanum, A. ×curtissii, A. ×heteroresiliens
Subordinate taxa
A. trichomanes subsp. quadrivalens, A. trichomanes subsp. trichomanes
Name authority Linnaeus: Sp. Pl. 2: 1080. (1753)
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