UW Burke Herbarium species comparison

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Asplenium trichomanes

Asplenium trichomanes ssp. quadrivalens

maidenhair spleenwort

maidenhair spleenwort
Habit Perennial from fibrous roots not proliferous; stems short-creeping, commonly branched; scales completely black or with brown edges, lanceolate, 2-5 mm long and 0.2-0.5 mm broad, margins entire or finely toothed.
Leaves

Leaves monomorphic;

petiole reddish to blackish brown, somewhat shiny, 1-4 cm, 1/4 length of blade or less, with black scales linear-lanceolate or filiform at base, or none;

blade linear, 1-pinnate, 3-22 cm long and 0.5-1.5 cm broad, thin, slightly pubescent or not, base tapering gradually, apex narrowly acute, not rooting;

rachis reddish brown, shiny, glabrous or with sparse indument;

pinnae in 15-35 pairs, oblong to oval, medial pinnae 2.5-8 mm long and 2.5-4 mm broad, base broadly wedge-shaped, sometimes with low rounded auricle facing apex, margins with shallow round teeth to serrate to entire, apex obtuse.

Spores

Sori in 2-4 pairs per pinna; spores 64 per sporangium.

Asplenium trichomanes

Asplenium trichomanes ssp. quadrivalens
Habitat Cliff crevices, rocky outcroppings, and talus slopes, generally where moist. Often on calcareous rocks,
Distribution
Occurring chiefly west of the Cascades crest in Washington; Alaska to California, also in southern Rocky Mountain states and in central U.S. and eastern North America.
[WildflowerSearch map]
[BONAP county map]
Occurring chiefly west of the Cascades crest in Washington; southern British Columbia to northwestern Oregon; also in eastern North America.
[BONAP county map]
Origin Native Native
Conservation status Not of concern Not of concern
Sibling taxa
A. viride
A. trichomanes ssp. trichomanes
Subordinate taxa
A. trichomanes ssp. quadrivalens, A. trichomanes ssp. trichomanes
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Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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