155,115 species and infraspecific names are in the database, 21,784 images, 59,948 bibliographic items, 433,667 distributional records.

Ezo Adey, Masaki & Akioka, 1974

Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Corallinophycidae
Order Corallinales
Family Lithophyllaceae
Subfamily Lithophylloideae

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.

Taxonomic status: currently recognized as a distinct genus.

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.

Description: 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 5 Oct 2010 by M.D. Guiry.

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.

Numbers of names and species: There is only one species or infraspecific name in the database at present, which has been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..

Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):

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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.

Created: 28 December 2000 by M.D. Guiry

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Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 18 April 2019.

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