Morphological and biological features of the red alga Chondrophycus kangjaewonii (K.W. Nam & C.H. Sohn) D.J. Garbary & J.T. Harper (Ceramiales, Rhodomelaceae) recorded for the first time from the Russian coast

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Abstract

The red alga Chondrophycus kangjaewonii (K.W. Nam & C.H. Sohn) D.J. Garbary & J.T. Harper recorded from Peter the Great Bay (Sea of Japan) is the first evidence for the presence of the genus Chondrophycus (J. Takida & Y. Saito) Garbary & J.T. Harper in coastal waters of Russia. The morphology of C. kangjaewonii from Peter the Great Bay is described in detail. Genetic data and information on the biology of the species are here presented for the first time.

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About the authors

O. S. Belous

Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences

Author for correspondence.
Email: ksu_bio@mail.ru
ORCID iD: 0000-0001-5540-8044
Russian Federation, Vladivostok, 690041

A. V. Skriptsova

Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences

Email: ksu_bio@mail.ru
ORCID iD: 0000-0001-5943-4522
Russian Federation, Vladivostok, 690041

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Supplementary files

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2. Fig. 1. Phylogenetic tree of the tribe Laurenciaea constructed by the maximum likelihood method based on the rbcL gene sequence data. The numbers at the nodes are the values of standard nonparametric bootstrap support.

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3. Fig. 2. Vegetative and reproductive morphology of Chondrophycus kangjaewonii: external appearance of a sterile young plant (a); external appearance of a mature plant in July (b); protruding cortical cells at the tips of terminal young branchlets (c); cross section showing wide goblet cells of the cortex without secondary pore connections (d); longitudinal section through the apical pit showing an axial cell with two pericentral cells (e); spermatangial stichidium (f); mature cystocarp with non-protruding ostiole (g); external appearance of a tetrasporangial plant (h); tetrasporangial stichidia (i); terminal branchlets with perpendicular arrangement of tetrasporangia (j); terminal branchlets with parallel arrangement of tetrasporangia (k); cross section through a stichidium showing parallel arrangement of tetrasporangia (m). Legend: a – axial cell, o – ostiole, p – pericentral cells, n – nucleus, s – spermatangia, sc – sterile cell, t – tetrasporangia, yt – young tetrasporangia, mt – mature tetrasporangia.

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4. Fig. 3. Schematic diagram of the arrangement of tetrasporangia: perpendicular to the central axis (a) and parallel to the central axis (b). Legend: t – tetrasporangia, a – central axis.

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5. Fig. 4. Chondrophycus kangjaewonii growing epiphytically on Coccophora langsdorfii (a); C. kangjaewonii with the epiphyte Leathesia marina (b) (shown by arrows).

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6. Fig. 5. Variability of size and weight characteristics of Chondrophycus kangjaewonii during the period of its mass development (data from May to July).

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