Original paper
Morphology of Eunotia flexuosa (Brébisson ex Kützing) Kützing, Eunotia flexuosa var. bicapitata Grunow (in Van Heurck 1881) and Synedra biceps W.Smith
Jüttner, Ingrid; Williams, David M.; Pottiez, Margaux; Vijver, Bart Van de
Nova Hedwigia Band 121 Heft 3-4 (2025), p. 253 - 266
24 references
published: Sep 11, 2025
published online: Feb 26, 2025
manuscript accepted: Dec 5, 2024
manuscript received: Oct 24, 2024
DOI: 10.1127/nova_hedwigia/2025/1104
ArtNo. ESP050012103006, Price: 29.00 €
Abstract
The original (type) materials of Synedra flexuosa Bréb. ex Kütz., Synedra biceps W.Sm., and Eunotia flexuosa var. bicapitata Grunow conserved at the Van Heurck Collection (BR, Meise Botanic Garden, Belgium) and at the Natural History Museum (BM), London, have been investigated using light and scanning electron microscopy. All three names refer to the same species: Eunotia flexuosa (Bréb. ex Kütz.) Kütz. The present contribution unravels the taxonomic history of Eunotia flexuosa. Observations of the three taxa indicates that they are identical in their morphology, making Synedra biceps and Eunotia flexuosa var. bicapitata younger synonyms of E. flexuosa. The species is characterised by its very long, slightly arcuate to almost linear valves with more or less parallel valve margins, not (or slightly) tapering towards the inflated apices and terminal raphe fissures recurving onto the valve face.
Keywords
Eunotia • morphology • taxonomy • type material