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Asplenium adulterinum Milde  
Family: Aspleniaceae
[Asplenium fallax (Heufl.) Dörfl., moreAsplenium viride subsp. fallax Heufler]
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Warren H. Wagner Jr.
Robbin C. Moran
Charles R. Werth in Flora of North America (vol. 2)
Roots not proliferous. Stems short-creeping, mainly unbranched; scales black or with narrow pale borders, narrowly lanceolate, 1.5--3 × 0.2--0.4 mm, margins entire. Leaves monomorphic. Petiole dark reddish brown throughout, 1--4 mm; indument of black linear scales at base. Blade linear, 1-pinnate, 2.5--14 × 0.5--1.2 cm, thick (open habitat) to herbaceous (shaded, moist habitat), essentially glabrous; base somewhat tapered; apex obtuse, not rooting. Rachis reddish brown in proximal 1/2--4/5, green distally, lustrous, glabrous. Pinnae in 10--30 pairs, ovate to rhombic to ovate-oblong, 2.5--11 × 2--6 mm; base truncate to shortly acute; margins shallowly crenate (shade forms) to essentially entire (exposed forms); apex obtuse, broadly rounded. Veins free, evident to obscure. Sori 1--3 pairs per pinna on both basiscopic and acroscopic sides. Spores 64 per sporangium. 2 n = 144. Crevices in limestone; 1250 m; B.C.; Europe. In North America Asplenium adulterinum is known to occur on Vancouver Island, British Columbia, where only the fertile allotetraploids are known. It is likely to occur in areas where the two parents, A . trichomanes and A . trichomanes-ramosum , grow together. The genetics of the American plants should be compared with that of the European, among which two nothosubspecies occur (F. Mokry et al. 1986).

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The PCC, and this data portal, were made possible by funding from the National Science Foundation’s Advancing Digitization of Biological Collections (ADBC) program, grant numbers 1802504, 1802352, 1802134, 1802033, 1802270, 1802255, 1802239, 1802446, 1802305.
The pteridoportal taxonomic thesaurus is based on the Checklist of Ferns and Lycophytes of the World, generously provided by Michael Hassler.