Holotype species: Heteroralfsia saxicola (Okamura & Yamada) H.Kawai
Original publication and holotype designation: Kawai, H. (1989). Life history and systematic position of Heteroralfsia saxicola gen et comb. nov. (Ralfsiaceae, Phaeophyceae). Phycologia 28: 243-251.
Taxonomic status: currently recognized as a distinct genus.
Gender: This genus name is currently treated as feminine.
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.
Description: Erect thallus summer annual, crustose portion probably perennial. Epilithic on upper intertidal rocks, gregarious on crustose basal portion, simple, cylindrical attenuated towards the base, hollow, slightly slimy, elastic, yellowish to reddish brown. Crustose portion composed of basal cell layer and closely packed, parallel, erect filaments which issue on basal cell layer. Erect portions of thalli are multiaxial, pseudo-parenchymatous. Medullary filaments densely packed and simple near the base, rather loose and connected with each other here and there in the middle and upper parts, resulting in the formation of a reticular medullary layer. Surface of young erect thallus covered with cuticle, shed following the development of the multicellular paraphyses. Hairs lacking its own basal meristematic region present. Obovoid, sessile unilocular sporangia formed on basal cell of assimilatory. Cells contain rich physodes, a cup shaped chloroplast without pyrenoid, which often become fragmented later. In culture zoospore show a discal type of germination forming emptied embryospore and develop into Ralfsia-like crustose thalli forming intercalary plurilocular sporangia with a terminal sterile cell in each file. Erect filamentous thalli develop on the crustose thalli, forming radiate multicellular assimilatory filaments and unilocular sporangia.
Information contributed by: H. Kawai. The most recent alteration to this page was made on 21 Jun 2014 by M.D. Guiry.
Comments: Endemic to temperate water of Eastern Asia (Quindao, Japan Sea coast of 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):
Click here to also show infraspecific names in the list below.
Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.
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
Verified by: 21 June 2014 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=41124
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 03 March 2021.