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Issue: Vol. 715 No. 3: 22 Aug. 2025
Type: Article
Published: 2025-08-22
DOI: 10.11646/phytotaxa.715.3.1
Page range: 179-206
Abstract views: 465
PDF downloaded: 17

Nitella hollerbachii (Charophyceae, Characeae) – a new species from Pacific Asia

Dobra Voda, Bar, 85356 Montenegro
Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 100-letiya Vladivostoka Ave., 159, 690022 Vladivostok, Russia
Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 100-letiya Vladivostoka Ave., 159, 690022 Vladivostok, Russia
Komarov Botanical Institute of the Russian Academy of Sciences, Professora Popova Str., 2, 197376 St. Petersburg, Russia
Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 100-letiya Vladivostoka Ave., 159, 690022 Vladivostok, Russia
Nitella axillaris Nitella axilliformis Nitella caroliniana Nitella dregeana Nitella macilenta Nitella setchellii oospores phylogeny Primorsky Krai rice fields Algae

Abstract

A new monoecious species of Nitella, N. hollerbachii sp. nov., is described here using an integrative taxonomic approach. The specimens were collected in 1928 by Vazinger-Alektorova from rice fields near Lake Khanka in Pacific Asia, the Primorsky Krai of Russian Federation. This monoecious species has brachydactylous sterile branchlets and condensed fertile branchlets forming on short abbreviated lateral branches inside the whorls of sterile branchlets. This species has bicellulate dactyls, and an absence of mucilage and gametangia at the bases of whorls. The oospores have a reticulate ornamentation on the surface. Phylogenetic analyses based on chloroplast (rbcL) or nuclear (ITS) DNA markers suggest that the new species is similar to accessions of ’N. axillaris‘ and ’N. axilliformis‘ with reticulate oospores, i.e. these accessions are different from the original material of N. axillaris having granulate oospores. However, all three species can be easily differentiated on the basis of morphological traits. Nitella hollerbachii differs from East-Asian N. axilliformis by having clustered oogonia, an absence of gametangia at the bases of branchlet whorls and end furcations of the 3–furcate branchlets, commonly 3–furcate fertile branchlets, large, well-developed fertile heads, smaller oogonia and antheridia. Several species in the section Persoonia sensu R.D. Wood have a reticulate oospore surface, so other, vegetative, morphological characters should be considered for reliable identification and delimitation of species.

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How to Cite

Romanov, R.E., Nikulin, V.Y., Nikulin, A.Y., Ivanov, S.D. & Gontcharov, A.A. (2025) Nitella hollerbachii (Charophyceae, Characeae) – a new species from Pacific Asia. Phytotaxa 715 (3): 179–206. https://doi.org/10.11646/phytotaxa.715.3.1