How many taxa are in the genus Aaccobasis h. Buch? Evidence from integrative taxonomy

Abstract

The genus Saccobasis is revised based on an integrative approach. The name S. polymorpha is synonymized with S. polita because neither molecular nor significant morphological differences were found between these taxa. At the same time, a group of Saccobasis specimens is proposed to be considered a new variety S. polita var. arctica as it forms a separate clade in constructed trees and differs morphologically from previously recognized taxa. Detailed descriptions of the species S. polita and its new variety are provided. The differences between Saccobasis and morphologically similar taxa, as well as the variability of the main features of the genus are considered. The characteristic features of S. polita var. polita and S. polita var. arctica are illustrated with photomicrographs, and the distribution of both taxa is pointed on a map. РезюмеПроведена ревизия рода Saccobasis на основе интегративного подхода. Название S. polymorpha синонимизировано с S. polita поскольку не обнаружено ни молекулярных, ни существенных морфологических отличий между этими таксонами. При этом группу образцов, образующих отдельную кладу на построенных филогенетических древах и отличающихся рядом морфологических признаков, экологией и распространением, предложено рассматривать как отдельную разновидность S. polita var. arctica. Приводится подробное описание вида и новой разновидности, рассматриваются их отличия от морфологически сходных видов. Работа иллюстрирована фотографиями признаков S. polita var. polita и S. polita var. arctica, а также картой их точечного распространения.

Saccobasis polita var. arctica (Scapaniaceae, Marchantiophyta) from Novaya Zemlya Archipelago (European Russian Arctic)

“…The molecular study revealed its position within Saccobasis H. Buch. After publication by Konstantinova et al (2022) it became evident that our specimen fits well in S. polita var. arctica, variety that has been described from Svalbard (Norway) and reported from the Trans-Baikal Territory and Franz Josef Land of Russia.…”

“…arctica from previously published 0.3% in ITS1-2 and 0% in trnL-F and suggests this taxon as more variable than S. polita var. polita (Konstantinova et al, 2022).…”

“…The procedures of DNA extraction and amplification were carried out according with protocols described in Konstantinova et al (2022). Obtained sequences of ITS1-2 nrDNA and trnL-F cpDNA were assembled in BioEdit ver.…”

“…Schljakov. Integrative study of Saccobasis by Konstantinova et al (2022) resulted in rejection of S. polymorpha, its inclusion in synonyms of Saccobasis polita (Nees) H. Buch. and description of new variety Saccobasis polita var.…”

“…arctica and facilitate its distinguishing in critical collections. An extensive description and analysis of variability of S. polita by Konstantinova et al (2022) were made without separate descriptions of var. polita and var.…”