Asplenium vespertinum

Maxon

Bull. Torrey Bot. Club 27: 197. 1900.

Common names: Western spleenwort
Synonyms: Asplenium trichomanes var. vespertinum (Maxon) Jepson
Treatment appears in FNA Volume 2.

Roots not proliferous. Stems short-creeping, rarely branched; scales black with lighter margins, linear-lanceolate, 2–3 × 0.2–0.4 mm, margins entire, or denticulate distally. Leaves monomorphic. Petiole reddish-brown or purplish black throughout, lustrous, 2–5 cm, 1/4–1/6 length of blade, sometimes curved like a J at base; indument of blackish brown, filiform scales at base. Blade linear, 1-pinnate throughout, 5–15 (–28) × 1–2.5 cm, thick, glabrous; base gradually tapered; apex acute, not rooting. Rachis reddish-brown or purplish black throughout, shiny, glabrous. Pinnae 15–30 pairs, oblong; medial pinnae 5–10 × 2–3 mm; base rounded to cuneate; margins lobed or serrate; apex obtuse. Veins free, obscure. Sori 2–6 pairs per pinna, on both basiscopic and acroscopic sides. Spores 64 per sporangium.


Habitat: Moist, shaded canyon walls and at base of overhanging rocks
Elevation: 0–1000 m

Distribution

V2 696-distribution-map.gif

Calif., Mexico in Baja California

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Asplenium vespertinum"
not rooting +
Obtuse (?) +  and Acute (?) +
Warren H. Wagner Jr. +, Robbin C. Moran +  and Charles R. Werth +
rounded +  and cuneate +
simple +  and 4-pinnate +
15 cm150 mm <br />0.15 m <br /> (28 cm280 mm <br />0.28 m <br />) +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
thick;1cm;2.5cm +
Western spleenwort +
Calif. +  and Mexico in Baja California +
0–1000 m +
Moist, shaded canyon walls and at base of overhanging rocks +
monomorphic +
fertile +  and than sterile ones +
serrate +, lobed +, denticulate +  and entire +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
perforate +, reticulate +, spiny +  and winged +
not articulate +
purplish black +  and reddish-brown +
1/4 length of blade;1/6 length of blade +
c--shaped +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
15 (?) +  and 30 (?) +
Bull. Torrey Bot. Club +
purplish black +  and reddish-brown +
not proliferous +
blackish brown +  and black +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
filiform +  and linear-lanceolate +
0.2mm;0.4mm +
acroscopic +  and basiscopic +
less lunate;linear +
dorsiventral +  and symmetric +
Asplenium trichomanes var. vespertinum +
Asplenium vespertinum +
Asplenium +
species +
anastomosing +