Asplenium oligosorum Mickel & Beitel
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Authority
Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.
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Family
Aspleniaceae
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Scientific Name
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Description
Species Description - Roots filiform, fibrous, not proliferous; rhizomes shortcreeping to suberect; rhizome scales black, clathrate, 1–1.5 x 0.1– 0.3 mm, entire; fronds clumped, 5–16 cm long; stipes atropurpureous, lustrous, (1–)2.5–3.5 cm x 0.5–0.6 mm, 1/3–2/5 of frond length, glabrous, adaxially with very narrow brown wings; blades 1-pinnate, 4–13 x 1.3–1.5 cm, apices pinnatifid, not proliferous; rachises atropurpureous, lustrous, glabrous, adaxially with brown, wings 0.1–0.3 mm wide; pinnae oblong, arcuate, 12–18 pairs, (5–)7–8 x 3–5 mm, opposite proximally, alternate distally, sessile, dimidiate, articulate, rachis color not extending onto pinna stalks, acroscopic bases of pinnae usually overlapping rachises, apices rounded to obtuse, entire to undulate-serrate; veins simple or 1-forked near their bases, tips evident adaxially; indument absent, except for scattered, appressed hairs 0.1 mm long on laminae abaxially; sori 1 or 2 per pinna, on one or both sides of midveins, if only one then this parallel to and adjoining the basiscopic margin; indusia whitish, 2–4 x 0.8–1 mm, margins undulate; spores reniform.
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Discussion
Type. Mexico. Oaxaca: Distrito Teotitla´n, Mpio. Tenango, first half of the trail from San Marti´n Caballero to Tenango, Hallberg 1444 (NY!; isotype UC!).
Asplenium oligosorum is closely related to A. olivaceum and differs from that in the less rounded (more arcuate) pinnae that usually overlap the rachises, more coarsely undulate pinna margins, prominent brownish wings on the stipes and rachises adaxially, and larger indusia.