The genus Cystoseira s. l. (Ochrophyta, Fucales, Sargassaceae) in the Black Sea: morphological variability and molecular taxonomy of Gongolaria barbata and endemic Ericaria crinita f. bosphorica comb. nov. Author Sadogurska, Sofia S. 0000-0002-6370-182X M. G. Kholodny Institute of Botany of National Academy of Science of Ukraine, Department of Phycology, Lichenology and Bryology, Kyiv, Ukraine & s. sadogurska @ gmail. com; https: // orcid. org / 0000 - 0002 - 6370 - 182 X s.sadogurska@gmail.com Author Neiva, João 0000-0002-5927-4570 Centro de Ciências do Mar, Universidade do Algarve - Campus de Gambelas, Faro, Portugal & jmneiva @ ualg. pt; https: // orcid. org / 0000 - 0002 - 5927 - 4570 jmneiva@ualg.pt Author Falace, Annalisa 0000-0002-9671-5283 Department of Life Sciences, University of Trieste, Trieste, Italy & falace @ units. it; https: // orcid. org / 0000 - 0002 - 9671 - 5283 falace@units.it Author Serrão, Ester A. 0000-0003-1316-658X Centro de Ciências do Mar, Universidade do Algarve - Campus de Gambelas, Faro, Portugal & eserrao @ ualg. pt; https: // orcid. org / 0000 - 0003 - 1316 - 658 X eserrao@ualg.pt Author Israel, Álvaro Israel Oceanographic & Limnological Research, the National Institute of Oceanography, Tel Shikmona, Haifa, Israel & alvaro @ ocean. org. il text Phytotaxa 2021 2021-01-15 480 1 1 21 http://dx.doi.org/10.11646/phytotaxa.480.1.1 journal article 10.11646/phytotaxa.480.1.1 1179-3163 5413938 Cystoseira barbata f. hoppei (C.Agardh) Woronichin (1908: 117) nom inval. Note: J.G.Agardh suggested to consider C. hoppei C.Agardh (1820: 59, as ‘Hoppii’ ) as infraspecific taxon of C. barbata : C. barbata var. hoppei (C.Agardh) J.Agardh (1842: 51) . In his original work Woronichin (1908) , quoting J.G.Agardh, erroneously referred to this taxon as “forma” and used the combination “ C. barbata f. hoppii J. Ag. ”. This combination was lately incorrectly cited as C. barbata f. hoppei (C.Agardh) Woronichin. Considering that Woronichin actually never suggested such combination in his work under his authorship, the combination C. barbata f. hoppei (C.Agardh) Woronichin should be considered as nom. inval.