Sarcodiotheca Kylin, 1932

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 pls.

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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 2020-03-10 by M.D. Guiry.

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

Gender: This genus name is currently treated as feminine.

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.

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.

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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.

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 10 March 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 19 June 2024

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