Holotype species: Sarcodiotheca furcata (Setchell & N.L.Gardner) Kylin
Original publication and holotype designation: Kylin, H. (1932). Die Florideenordung Gigartinales. Acta Universitatis Lundensis 28(8): 1-88, 22 figs, 28 plates.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Schneider, C.W. & Wynne, M.J. (2007). A synoptic review of the classification of red algal genera a half a century after Kylin's "Die Gattungen der Rhodophyceen". Botanica Marina 50: 197-249.
Type selected by Kylin (1932: 15). - (23 Jan 2017) - M.D. Guiry
Description: Plants of the largest species reach 45 cm in length. Thalli are erect from a discoid holdfast and are terete to flattened (with varying numbers of adventitious marginal branchlets), and irregularly to dichotomously branched. Thalli are multiaxial, each axial cell giving rise to a single periaxial derivative, with successive derivatives being aligned in orthostichous rows. The medulla consists of loosely organized filaments surrounded by a pseudoparenchymatous cortex. Spermatangia occur in extensive sori. Carpogonial branches are 3(-4)-celled, the fertilized carpogonia typically emitting two unbranched, non-septate connecting filaments. Auxiliary cells and cells of the cortical filament bearing the auxiliary cells are morphologically distinctive and darkly staining prior to diploidization (i.e., form an “auxiliary cell complex"). Diploidization is followed by growth of nutritive filaments from cells surrounding the auxiliary cell, and early gonimoblasts grow among and fuse often with gametophytic cells to form a sterile central placenta. Carposporangia form in branched chains on peripheral gonimoblasts, the mature cystocarp being ostiolate and surrounded by a thick pericarp with a filameantous inner hull. Tetrasporangia are scattered in the outer cortex and are laterally attached.
Information contributed by: G.T. Kraft. The most recent alteration to this page was made on 23 Jan 2017 by M.D. Guiry.
Comments: Gabrielson (1982a) places Sarcodiotheca in the Agardhielleae and considers the genus a forerunner and close relative of Agardhiella, which differs in having a more extensive placenta and shorter chains of carposporangia. The anatomy and taxonomy of the genus has been detailed by Gabrielson (1982a, 1982b). Distribution: The type species occurs in mostly deeply subtidal habitats from southern British Columbia to Ecuador and the Galapagos Islands (Abbott and Hollenberg 1976; Gabrielson 1982a, 1982b). Most species are restricted to the eastern Pacific Ocean from Baja California to Ecuador, with two also recorded from the western Atlantic of the southeastern United States and the Caribbean.
Numbers of names and species: There are 11 species names in the database at present, of which 10 have 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: 23 January 2017 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=37126
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 26 September 2018.