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Abstract
<em>Blechnum spicant</em> var. <em>fallax</em> Lange is a fern taxon endemic to Iceland where it occurs in the vicinity of hot springs on geothermally heated soils. The taxon was first described by a Danish botanist Johan Martin Christian Lange in 1880 on the basis of plant material collected by Christian Grønlund in Iceland. Because its holotype was not designated in the protologue, we examined the extant original material including illustrations from <em>Flora Danica</em> and a single plant on sheet C10021769 (deposited in C) that was the basis for the respective plate. We select this specimen as the lectotype of <em>Blechnum spicant</em> var. <em>fallax</em>.
Highlights
Blechnaceae is an important leptosporangiate fern family distributed mainly in tropical regions of America and Australasia that comprises around 220–250 taxa in an uncertain number of genera [1,2]
It is estimated that about 80% of the species within Blechnaceae belong to the genus Blechnum [3]
Blechnum spicant (L.) Roth. is the only species from Blechnaceae with a circumpolar distribution that occurs in temperate and even cold regions of the Northern Hemisphere [5]
Summary
Blechnaceae is an important leptosporangiate fern family distributed mainly in tropical regions of America and Australasia that comprises around 220–250 taxa in an uncertain number of genera [1,2]. Keywords lectotype; Blechnum spicant; Iceland; nomenclature; Lange; Grønlund; Blechnaceae; hard-fern; deer fern Plants belonging to this taxon were first found by a Danish botanist Christian Grønlund during his excursion to Iceland in 1876 [7].
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