Two newly recorded species of <i>Lobophora</i> (Dictyotales, Phaeophyceae) for Viet Nam

Nguyen Quynh Nga; Dam Duc Tien; Christophe Vieira

doi:10.15625/2525-2518/21348

Author affiliations

Authors

Nguyen Quynh Nga \(^1\) National Institute of Medicinal Materials (NIMM), 3B Quang Trung street, Cua Nam ward, Hanoi, Viet Nam https://orcid.org/0009-0004-4217-7127
Dam Duc Tien \(^2\) Institute of Marine Environment and Resources (IMER), Vietnam Academy of Science and Technology (VAST), 246 Da Nang street, Ngo Quyen ward, Hai Phong city, Viet Nam
\(^3\) Graduate University of Science and Technology, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet street, Nghia Do ward, Ha Noi, Viet Nam
\(^4\) Haiphong University of Medicine and Pharmacy, 72A Nguyen Binh Khiem street, Gia Vien ward, Hai Phong city, Viet Nam https://orcid.org/0000-0001-5396-6886
Christophe Vieira \(^5\) Research Institute of Basic Science, Jeju National University, Jeju 63243, Korea

DOI:

https://doi.org/10.15625/2525-2518/21348

Keywords:

Lobophora, Vietnam Algal flora, new record, morpho-genetic taxonomy, rbcL, cox3

Abstract

Lobophora providenceae C.W.Vieira and Lobophora challengeriae C.W.Vieira are newly recorded from Co To island, Quang Ninh province, Viet Nam. Collected specimens are similar to Lobophora providenceae C.W.Vieira and Lobophora challengeriae C.W.Vieira recently described from Bismarck Sea (Papua New Guinea), not only in morphology but also in rbcL and cox3 gene sequences. The Lobophora providenceae: Thallus flabellate shaped, predominantly ruffled, dark brown, weakly attached to the hard substratum. The Thallus base is narrow, attached to the substratum by a basal rhizoids-margin entire. The Thallus is 91.2 – 93.1 μm thick, composed of 5 cell layers (single-cell layered medulla, two-cells layered cortex on the dorsal side, and one or two-cells layered cortex on the ventral side); Reproductive structures are undetected. Lobophora challengeriae: Thallus flabellate shaped, predominantly ruffled, light to dark brown, base narrow, and attached to the substratum by basal rhizoids. The thickness of the thallus is 108.3 – 115.9 μm and composed of 8–9 cell layers including four cell layers on the dorsal side, single-cell layer medulla, and three or four cells layer on the ventral side. Both species were found on dead coral reefs in the subtidal zone in Co To. Reproductive structures were undetected.

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