Typification and the current taxonomic status of Laminaria agarum var. аsiaticum and Laminaria boryi (Agaraceae, Laminariales)

Abstract

K e y w o r d s : lectotypification, taxonomic revision, Kamchatka, Newfoundland, Lami­ naria agarum var. аsiaticum, Laminaria boryi, Laminariales Р Е З Ю М Е Климова А.В., Клочкова Т.А., Клочкова Н.Г. Типификация и совре­ мен ный таксономический статус Laminaria agarum var. asiaticum и La­ mi na ria boryi (Agaraceae, Laminariales). В статье обозначены лектотипы наз ваний Laminaria agarum var. аsiaticum и Laminaria boryi и дано историческое обос нование для их типификации. Эти таксоны были описаны де Ла Пиляи в 1830 г. по материалам, собранным у берегов Камчатки (северо­западная часть Тихого океана) и Ньюфаундленда (северо­западная часть Атлантичес­ кого океана). На основе современных данных по морфологии и распрост­ ра нению представителей рода Agarum в Мировом океане, предложено рас смат ривать указанные выше таксоны в качестве синонимов широко рас­ про страненной в Северном Полушарии ламинариевой водоросли Agarum clathratum subsp. clathratum. Ключевые слова: лектотипификация, таксономическая ревизия, Камчатка, Нью­ фаунд ленд, Laminaria agarum var. аsiaticum, Laminaria boryi, Laminariales Anna V. Klimova* e­mail: annaklimovae@mail.ru Tatyana A. Klochkova e­mail: tatyana_algae@mail.ru Nina G. Klochkova e­mail: ninakl@mail.ru Kamchatka State Technical University, Petropavlovsk­Kamchatskу, Russia * corresponding author Manuscript received: 18.02.2020 Review completed: 15.04.2020 Accepted for publication: 20.04.2020 Published online: 23.04.2020 Anna V. Klimova*, Tatyana A. Klochkova & Nina G. Klochkova Typification and the current taxonomic status of Laminaria agarum var. аsiaticum and Laminaria boryi (Agaraceae, Laminariales) The first member of the genus Agarum Dumort. was described as Fucus agarum S.G. Gmelin in the second half of the 18th century (Gmelin 1768). Before segregation of the genus Agarum by Dumortier into a single taxon in 1822, its members were designated under different generic names, in clu ding also the genus Laminaria J.V. Lamour. (Agardh 1817). In 1840, species of Agarum and related taxa (viz. Costaria Grev., Thalassiophyllum Postels & Rupr.) were included in the fa mily Agaraceae by Postels & Ruprecht (1840). Species of Agarum are important in sublittoral habitats because they often dominate communities at a depth of 10 to 30 m (Gagnon et al. 2005). As discussed in the present study, Laminaria agarum (S.G. Gme lin) C. Agardh var. аsiaticum Bach.Pyl. and L. boryi Bach.Pyl. show a typical morphology for members of the genus Agarum. Typification of these two names allows cla ri fi­ cation of the taxonomic status of these taxa with subse quent synonymising of them with Agarum clathratum Dumort. Our study is based on an analysis of algological literature (Gmelin 1768, Stackhouse 1816, Agardh 1817, Dumortier 1822, Bory 1826, De la Pylaie 1830, Postels & Ruprecht 1840, Silva 1991, Boo et al. 2011, Kawai et al. 2017). The authors of this paper have examined living populations of Agarum species in the field on the different coasts of Rus sian Far Eastern seas viz. southeast Kamchatka, Bering Island, Kuril Islands and South Sakhalin. We also have stu died herbarium specimens of Agarum that belong to the ori gi nal material from the Komarov Botanical Institute RAS (LE) and other Agarum specimens using online herbarium data­ bases at PC, BM, ALAJ, NHA, MASS, MAINE, FH and NY (open access https://macroalgae.org/portal/). Her barium codes are given according to Triers (2020). Ab bre viations of authors names are given according to IPNI (2020). The protologues, type specimens of all species, in for ma­ tion from AlgaeBase (2020) and Index Nominum Algarum (2020) databases were analyzed during our research. Histor ical background The “Flora de l’Ile Terre­Neuve et des Filles Saint Pierre et Miquelon” by De la Pylaie (Bachelot de la Pylaie 1830) presents a floristic summary of marine macroalgae from Newfoundland, Saint Pierre and Miquelon based on the study of per so nal algal materials collected during his ex­ pe di tion on the frigate “Cybele” (1816–1819) in the north­ west part of the Atlantic ocean (Gillot 1953), and also on the study of samples from marine algal collections held in Paris National Museum of Natural History (PC). While wor king with specimens from the museum, De la Pylaie consulted with Bory de St­Vincent. In his work, De la Pylaie described 72 species and 28 varieties of algae and pro po­