Romanov R.E., Nikulin V.Yu., Nikulin A.Yu., Ivanov S.D., Gontcharov A.A.
В журнале Phytotaxa
Год: 2025 Том: 715 Номер: 3 Страницы: 179-206
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.
