Plant 8-20 cm, tufted from creeping rhizome. Frond unequally dichotomous, petiole longer than the lamina, green except at blackish base, lamina 1-2 times forked, primary divisions linear, stalked, the later segments sessile, apex of segments often ending in two or more fine points. Sori elongate, 5-10 x 1-2 mm. Spores ripe 4-8. In rock crevices, avoiding limestone, 200-2200 m.
Temperate Eurasia to N. Africa & Japan.
Very similar to subsp. septentrionale but with narrower segments and costae, a more slender frond, smaller spores and diploid cytotype.
Abkhazya. Euxine element.