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Abstract
A new monoraphid genus (Pogoneis) is described from a sample of epiphyton growing on the red alga Sarconema filiforme. Its relationship to other achnanthoid species was studied and two of these also proved to require allocation to new genera. Achnanthes hungarica was therefore transferred to Lemnicola nov. gen. and the marine taxon A. taeniata to Pauliella taeniata nov. gen.