Asplenium montanum Willdenow

Mountain spleenwort

Etymology Montanum refers to the mountains.
Description Rhizome: erect, occasionally branching, scales clathrate, to 3mm, dark brown.
Frond: 15 cm high by 5 cm wide, evergreen, monomorphic, blade/stipe ratio: 1:1 or less.
Stipe: purple-brown at base, fading to green , dark brown, narrowly deltate scales at base grading into multicellular hairs, vascular bundles: 2 C-shaped, back to back, uniting to 1 upwards to an X-shape.
Blade: 2-pinnate at the base, said to be occasionally more divided, always less upwards, oblong-triangular, leathery, dull, commonly with tiny glandular hairs and a few linear scales.
Pinnae: 6 to 9 pair, opposite to alternate, anadromic, stemmed, variable in shape; margins serrate or creanate; veins free, forking.
Sori: linear, along a vein, w-6 on each segment, indusium: translucent, pale tan, fimbriate, hidden by sporangia at maturity, on one side of the sorus, opening toward the middle of the segment, sporangia: brown.
Culture Habitat: crevices in sandstone or other acidic rocks. Distribution: eastern United States. Hardy to -30C, USDA Zone 4.
Asplenium montanum
Asplenium montanum. Frond and fertile pinna.  Illustration by Edgar Paulton, from How to Know the Ferns and Fern Allies, John T. Mickel, 1979 Wm. C. Brown Co.
Asplenium montanum
Asplenium montanum, a dried specimen from Vinton County, Ohio.  Jaknouse at Wikipedia
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