Ezo Adey, Masaki & Akioka, 1974
Holotype species: Ezo epiyessoense Adey, Masaki & Akioka
Original publication and holotype designation: Adey, W.H., Masaki, T. & Akioka, H. (1974). Ezo epiyessoense, a new parasitic genus and species of Corallinaceae (Rhodophyta, Cryptonemiales). Phycologia 13: 329-344.
Request PDFDescription: Thalli comprising small amorphous crusts attached to species of Lithophyllum by cell adhesion and haustoria that penetrate host. Plants consisting of two orders of filaments (dimerous); first-order filaments (primigenous filaments) growing in unistratose layers against the substrate and second-order filaments (postigenous filaments) growing upward from the first. Haustoria growing from lower sides of first-order filaments; contacting and sometimes fusing with host cells. Vegetative cells lacking plastids. Outermost walls of epithallial cells rounded or flattened, not flared. Cells in contiguous filaments sometimes joined by secondary pit-connections; cell fusions lacking. Trichocytes lacking. Reproductive cells forming within uniporate conceptacles. Tetrasporangia unknown. Bisporangial conceptacle roofs developing from filaments interspersed among the sporangia; central columella present and sporangia located in periphery of chamber. Apical sporangial plugs absent. Gametangia produced in conceptacles roofed by overarching peripheral filaments. Carpogonia and simple spermatangia occur on the floor of separate conceptacle chambers. All bispores reported in the literature were uninucleate, and presumably diploid. Such uninucleate bispores probably give rise to diploid bisporangial plants. Because gametangial plants have been found, it is probable that tetrasporangial plants are also present, although they have not yet been encountered.
Information contributed by: H.W. Johansen. The most recent alteration to this page was made on 2010-10-05 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
Most recent taxonomic treatment adopted: Woelkerling, W.J. (1988). The Coralline Red Algae: an analysis of the genera and subfamilies of nongeniculate Corallinaceae. pp. i-xi, 1-268, 259 figs, tables numbered by chapter. London & Oxford: British Museum (Natural History) & Oxford University Press.
Comments: Ezo appears to be an adelphoparasite evolutionarily derived from Lithophyllum-like ancestors; a species of Lithophyllum serves as its host (L. yessoense). Ezo differs from Lithophyllum in having haustoria, lacking plastids, and presumably being parasitic. It occurs on the coasts of Hokkaido, Japan.
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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=41512
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 05 October 2010. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 19 April 2024
