Botryocladia wrightii (Harvey) W.E. Schmidt, D.L.Ballantine et Fredericq, 2017

Schmidt, W. E., Lozada-Troche, C., Ballantine, D. L., Arakaki, N., Gabriel, D., Norris, J. N. & Fredericq, S., 2017, Taxonomic transfer of the red algae Chrysymenia enteromorpha and C. wrightii to the genus Botryocladia (Rhodymeniaceae, Rhodymeniales), Phytotaxa 324 (2), pp. 122-138 : 129-132

Botryocladia wrightii (Harvey) W.E. Schmidt, D.L.Ballantine et Fredericq , comb. nov.

Figures 15–22 .

BASIONYM: Halosaccion wrightii Harvey 1860: 332 , Proceedings of the American Academy of Arts and Sciences 4: 332.

HOMOTYPIC SYNONYMS: Chylocladia wrightii (Harvey) Okamura 1902: 45

Chrysymenia wrightii (Harvey) Yamada 1932: 118

TYPE LOCALITY: Hakodate, Hokkaido, Japan

DISTRIBUTION: Northwest Pacific, i.e. Japan, China and Korea ( Guiry and Guiry 2017). An invasive species in the Eastern Atlantic, Spain and France ( Ben Maïz et al. 1987, Bárbara et al. 2008).

SPECIMENS EXAMINED: Henashi (Fukaura), Aomori Prefecture (Aomori-ken) Japan, June 10, 1966, coll. M. Yoshizaki, MY-18-054.

RESULTS: Thalli ( Fig. 15 ) are completely corticated ( Fig. 16 ), composed of one to two cortical cell layers and two to three medullary layers of cells increasing in size toward the interior ( Fig. 17 ). Gland cells are borne on unmodified medullary cells that extend further into the medulla ( Figs 18–19 ), and may appear flattened ( Fig. 19 ). Internal filaments also found throughout the thallus ( Fig. 20 ) [ Fig. 19 is poor], developing from smaller cells cut off by larger medullary cells ( Fig. 19 ). The middle portion of holdfast ( Figs 21–22 ) is solid.

REMARKS. The presence of gland-bearing medullary cells extending further into the medulla was also observed by Bárbara et al. (2008).

REPRESENTATIVE SEQUENCES: EU977501, EU916717 (rbc L); EU916712, AF117129 (SSU rDNA).

on female gametophyte. Scale bar 1 mm.

Figures

FIGURES 15–22. Botryocladia wrightii (Harvey) W.E. Schmidt, D.L. Ballantine et Fredericq, comb. nov., from Henashi, Aomori-ken, Japan, MY 18-054. 15) Habit of non-reproductive plant. 16) Surface view of thallus showing complete cortication. Scale bar 40 μm. 17) Cross section through mid thallus region showing pigmented cortical cells and hyaline medullary cells. Scale bar 40 μm. 18) Cross section through middle portion of thallus region, showing irregular gland cell (arrowhead) on modified glandiferous medullary cell. Scale bar 40 μm. 19) Cross section through mid thallus region showing cortical cells, and medullary cell giving rise to internal filament (arrow). Scale bar 40 μm. 20) Medullary cell and internal filament (arrows). Scale bar 40 μm. 21) Cross section through middle part of holdfast showing cortical cells and medullary cells with dense aggregations of internal filaments. Scale bar 0.25 mm. 22) Internal medullary filaments in mid holdfast region, with pit-connection (arrowhead) linking one cell to a large medullary cell. Scale bar 40 μm.