Ishige Yendo, 1907

Holotype species: Ishige okamurae Yendo

Original publication and holotype designation: Yendo, K. (1907). The Fucaceae of Japan. Journal of the College of Science, Tokyo Imperial University 21(Article 12): 1-174, folded table, pls I- XVIII plates.

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Description: Plants attached on the rocks by discoid holdfast, irregularly dichotomously branched, terete or foliose with short stipe, up to 20 cm in height. Erect thalli composed of densely packed, entangled, colorless, thick-walled, isodiametric medullary filaments and pigmented cubic cortical cells of up to 20 cells long. Phaeophycean hairs present, forming cryptostomata. Unilocular sporangia and plurilocular sporangia formed on the same thallus or on separate thalli. Unilocular sporangia form on upper part of the thallus by transformation from the apical cells of cortical filaments. Plurilocular sporangia formed in sori on upper part of thalli, uniseriate, transformed from the assimilatory filaments. Pluri-spores biflagellated with longer anterior flagellum, 7.5-10 _m ( 5-6 _m in size, negatively phototactic, pear-shaped with a single chloroplast with a stigma. In culture, pluri-spores developed into pseudo-parenchymatous discs. Most of the cellular contents migrate into germination tube. Profusely branched upright filaments develop from the center of disc which further develop into dichotomously branched, parenchymatous erect thalli. Complete life history not clear yet, but presumably isomorphic.

Information contributed by: H. Kawai. The most recent alteration to this page was made on 2014-06-20 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Most recent taxonomic treatment adopted: Silberfeld, T., Rousseau, F. & Reviers, B. de (2014). An updated classification of brown algae (Ochrophyta, Phaeophyceae). Cryptogamie Algologie 35(2): 117-156, 1 fig., 1 table.

Comments: Distributed in warm temperate area of Western Pacific Ocean. Common on the intertidal rocks in the Pacific coast of central Honshu.

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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=36122

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 20 June 2014. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 03 December 2024