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ASPLENIACEAE SPLEENWORT FAMILY

Alan R. Smith

Rhizome-scale cells with lateral walls dark brown to ± black, surficial walls clear. Leaf: stipe ×-section with 1 X-shaped or 2 back-to-back C-shaped vascular strands; segment veins generally free. Sporangia: in linear [to oblong] sori along veins; indusia linear, opening away from veins; stalk cells in 1 row; spores elliptic, winged.
1 or 2 genera (most segregates now subsumed in Asplenium), 700 species: worldwide, especially tropics. —Scientific Editor: Thomas J. Rosatti.

ASPLENIUM SPLEENWORT
Plant in soil or on rocks; rhizome generally short-creeping to erect. Leaf: often tufted, generally glabrous; rachis often ± winged; blade simple or 1[many]-pinnate or forked; pinnae often more developed acroscopically, often without obvious midrib. Sporangia: indusia persistent, covering sori when young, later reflexed. (Greek: spleen)

Key to Asplenium

A. trichomanes L. subsp. trichomanes MAIDENHAIR SPLEENWORT
NATIVE
Leaf: 1-pinnate, many, clustered, 8–25 cm; stipe 1–3(5+) cm, 0.4–0.6 mm wide, narrowly winged adaxially, dark purple-brown, shiny; blade generally 0.5–1.5 cm wide, linear; pinnae 15–30(37) pairs, 3–6(7) mm, 2–3 mm wide, oblong, generally shallowly crenate on acroscopic and distal margins. Sporangia: sori generally 1–1.5 mm, generally 2–4 pairs per pinna.
2n=72. On rocks; 200 m. nw Klamath Ranges (Del Norte Co.); widespread in North America, Europe, Asia, southern temperate. [Online Interchange] {CNPS list}

Previous taxon: Asplenium septentrionale
Next taxon: Asplenium vespertinum

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Oct 20 2014
Citation for this treatment: [Author of taxon treatment] 2013. Asplenium, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=49325, accessed on Oct 20 2014

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Geographic subdivisions indicated for the distribution of Asplenium trichomanes subsp. trichomanes Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.