Platythamnion yezoense Inagaki 1935
Publication Details
Platythamnion yezoense Inagaki 1935: 47, fig. 4
Published in: Inagaki, K.-I. (1935). Some marine algae recently discovered in Japan and new to science. Scientific Papers of the Institute of Algological Research, Faculty of Science, Hokkaido Imperial University 1: 41-49, 4 figures.
Publication date: "1935-03-20" [University site]
Type Species
The type species (holotype) of the genus Platythamnion is Platythamnion heteromorphum (J.Agardh) J.Agardh.
Status of Name
This name is currently regarded as a synonym of Pterothamnion yezoense (Inagaki) Athanasiadis & Kraft.
Source of Synonymy
Athanasiadis, A. & Kraft, G.T. (1994). Description of Pterothamnion squarrulosum (Harvey) comb. nov. from south-eastern Australia and southern New Zealand, with a taxonomic re-assessment of the genera Pterothamnion, Platythamnion and Glandothamnus (Ceramiaceae, Rhodophyta). European Journal of Phycology 29: 119-133, 27 figs, 1 table.
Type Information
Syntype localities: "Washed ashore on Oshoro coast and Zenibako coast etc. in Shiribeshi Prov. about April and May."; (Inagaki 1935: 47) Lectotype (designated by whom? Oshoro, Otaru City, Hokkaido, Japan): April and May; CBM; (Yoshida 1998: 928) Notes: Isotype: SAP 022845 (Yoshida, 1998: 928).
General Environment
This is a marine species.
Description
Frond erect, filamentous, 2-5 cm high, consisting of subdichotomous main branches and 4-verticillate rami on each cell of the main branches, providing with filamentous rhizoids. Rhizoids colourless, consisting of single row of very elongated cells, irregularly dichotomous, stretching out from the bases of the main branches in general, but sometimes from rami in the basal portion of the frond. Main branches 200-210 microns in diam., consisted of a single row of cells. Cells of main branches cylindrical, with somewhat thick membranes, 2-2.5 times as long as broad, but in the basal portion of the frond often as long as broad. Rami 4-verticillate, issued from the upper end of each cell of the main branches, arranged in four vertical rows, 60-70 microns thick in the basal portion. Basal cells of rami 2-2.5 times as long as broad. Among four whorled rami, the two lateral ones much larger in dimensions than the two transversal ones. Two lateral rami provided with two rows of ramuli on their upper sides near base, but provided with only a single row of ramuli in their apical portions. Cortical cells irregularly polygonal. Apical cells triangular, their bases larger than their heights in a surface view. Cystocarps hemispherical, relatively larger, borne in the middle or the upper portion of the segment. Tetrasporangia roundish, borne on one or both sides along the midrib, forming a single longitudinal row or two cruciately divided. Colour purplish red. Frond adhering firmly to paper when drying.
Created: 12 October 1998 by M.D. Guiry.
Last updated: 11 July 2024
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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 11 July 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 06 January 2025
