Abstract
A new variety of the maidenhair fern, Adiantum pedatum var. subpumilum W. H. Wagner, is described. Known previously only as a garden plant, a natural population has been discovered on coastal rock cliffs on the Brooks Peninsula of NW Vancouver Island. The basic frond structure is like the typical variety, but the plant is extremely dwarfed, the fronds are only 6–12 cm tall with imbricated pinnules. The venation pattern is much simplified. Horticultural plants of var. subpumilum yield n = 29 pairs of chromosomes, like the typical variety. The diminutive stature of var. subpumilum is genetically fixed.
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