Asplenium monanthes |
Asplenium trichomanes |
|||||
---|---|---|---|---|---|---|
single-sorus fern, single-sorus spleenwort |
doradille chevelue, maidenhair spleenwort |
|||||
Roots | not proliferous. |
not proliferous. |
||||
Stems | erect, unbranched; scales black with lighter margins, linear-lanceolate, 3–6 × 0.4–0.8 mm, margins entire. |
short-creeping, often branched; scales black throughout or with brown borders, lanceolate, 2–5 × 0.2–0.5 mm, margins entire to denticulate. |
||||
Leaves | monomorphic. |
monomorphic. |
||||
Petiole | reddish brown throughout, lustrous, 1–12(–20) cm, 1/3–1/10 length of blade; indument of black filiform scales. |
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. |
||||
Blade | linear, 1-pinnate throughout, 5–25(–40) × 1–2.5(–3) cm, thick, glabrous; base gradually tapered; apex acute, not rooting. |
linear, 1-pinnate, 3–22 × 0.5–1.5 cm, thin, glabrous or sparsely pubescent; base gradually tapered; apex narrowly acute, not rooting. |
||||
Pinnae | in 10–40 pairs, oblong to quadrangular, somewhat asymmetric; medial pinnae 4–15 × 2–5 mm; base rounded to cuneate; margins crenulate or ± entire; apex obtuse. |
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. |
||||
Veins | free, obscure. |
free, evident. |
||||
Sori | 1(–3) per pinna, only on basiscopic side. |
2–4 pairs per pinna, on both basiscopic and acroscopic sides. |
||||
Spores | 32 per sporangium. |
64 per sporangium. |
||||
Rachis | reddish brown throughout, lustrous, glabrous. |
reddish brown throughout, lustrous, glabrous or nearly so. |
||||
n | = 2n = 108 (apogamous). |
|||||
2n | = 72, 144. |
|||||
Asplenium monanthes |
Asplenium trichomanes |
|||||
Habitat | Rock | |||||
Elevation | 50–1000 m (200–3300 ft) | |||||
Distribution |
AL; AZ; NC; SC; HI; Mexico; Central America; West Indies in Hispaniola; Jamaica; South America to n Argentina; Africa including Madagascar; Madeira; Réunion; Tristan da Cunha
|
AK; AL; AR; AZ; CA; CO; CT; DE; GA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; NC; NE; NH; NJ; NM; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; VA; VT; WA; WI; WV; WY; BC; NB; NF; NS; ON; QC; Worldwide
|
||||
Discussion | 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.) |
|||||
Key |
|
|||||
Source | FNA vol. 2. | FNA vol. 2. | ||||
Parent taxa | Aspleniaceae > Asplenium | Aspleniaceae > Asplenium | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Name authority | Linnaeus: Mant. Pl. 1: 130. (1767) | Linnaeus: Sp. Pl. 2: 1080. (1753) | ||||
Web links |
|