Contribution to the knowledge of Gongolaria barbata (Sargassaceae, Fucales) from the Mediterranean: insights into infraspecific diversity Author Falace, Annalisa 0000-0002-9671-5283 Department of Life Sciences, University of Trieste - Trieste, Italy. falace@units.it Author Manfrin, Chiara 0000-0002-4979-8557 Department of Life Sciences, University of Trieste - Trieste, Italy. cmanfrin@units.it Author Furnari, Giovanni 0009-0005-6598-7920 Dept. of Biological, Geological and Environmental Sciences - University of Catania, Italy. furnari.giovanni41@gmail.com Author Burchio, Sara D’Ambros 0009-0008-8066-4881 Department of Life Sciences, University of Trieste - Trieste, Italy. ambrosburchio@phd.units.it Author Pallavicini, Alberto 0000-0001-7174-4603 Department of Life Sciences, University of Trieste - Trieste, Italy. pallavic@units.it Author Descourvieres, Emmanuelle 0009-0000-8092-2504 Department of Life Sciences, University of Trieste - Trieste, Italy. emmanuelle.descourvieres@phd.units.it Author Kaleb, Sara 0000-0002-8584-7280 Department of Life Sciences, University of Trieste - Trieste, Italy. skaleb@units.it Author Lokovšek, Ana 0000-0003-2927-6089 Marine Biology Station Piran, National Institute of Biology, Piran, Slovenia. ana.lokovsek@nib.si Author Grech, Daniele 0000-0002-4936-5997 IMC-International Marine Centre, Oristano, Italy. d.grech@fondazioneimc.it Author Alongi, Giuseppina 0000-0003-2604-6106 Dept. of Biological, Geological and Environmental Sciences - University of Catania, Italy. g.alongi@unict.it text Phytotaxa 2024 2024-01-26 635 3 191 205 https://phytotaxa.mapress.com/pt/article/download/phytotaxa.635.3.1/51486 journal article 10.11646/phytotaxa.635.3.1 1179-3163 10592170 Gongolaria barbata f. aurantia (Kützing) Falace, Alongi et Kaleb comb. nov. Basionym: Cystoseira aurantia Kützing, 1843: 357 . Phycologia generalis……Leipzig XXXII+458 pp, 80 pls. Homotypic synonym: Cystoseira barbata f. aurantia (Kützing) Giaccone in Amico et al. (1986: 906) . Un nuovo approccio allo studio della sistematica del genere Cystoseira C. Agardh (Phaeophyta, Fucales ). Bollettino dell’Accademia Gioenia di Scienze Naturali di Catania, 18(326): 887–988. Note: in absence of molecular evidences, we here consider G. barbata f. aurantia from Mediterranean as a distinct taxon from C. barbata f. repens Zinova et Kalugina [= G. barbata f. repens (Zinova et Kalugina) Sadogurska ] described for the Black Sea, due to its morphological characters rather different from those of Zinova et Kalugina’s taxon as described and illustrated by Sadogurska (2021: 301, Fig 3 ), particularly due to the presence of short primary axis in f. repens (not present in f. aurantia ) and both lateral and ultimate branches in f. repens (neither lateral nor ultimate branches distinguishable in f. aurantia ) (see Sadogurska, 2021: 301, Fig 3a and Cormaci et al. 2012 tav 93 fig 1, respectively).