Stictosporum J., 1890
Holotype species: Stictosporum nitophylloides (Harvey) J.Agardh
Original publication and holotype designation: Agardh, J.G. (1890). Till algernes systematik. Nya bidrag. (Sjette afdelningen.). Lunds Universitets Års-Skrift, Andra Afdelningen, Kongl. Fysiografiska Sällskapets i Lund Handlingar 26(3): 1-125, III pls.
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.
Description: Plants reach 15 cm in length, are erect from the holdfast, and are flat, membranous, and proliferous from the margins of the subdichotomously branched axes. The uniaxial nature of the frond may be obscured rapidly by the thin, pseudoparenchymatous cortex, the medulla being very narrow. Cells of the central axial filaments give rise to two periaxial cells. The cortical filament containing the auxiliary cell and subtending supporting cell is made up of conspicuously smaller cells than surrounding vegetative filaments. The gonimoblast and subsequent carposporophyte development is directed towards the thallus surface, in contrast to most other Cystocloniaceae. The cystocarp consists of the auxiliary cell, to which some cells of the inner gonimoblast fuse, and radiating files composed mostly of carposporangia, there being little sterile tissue in the carposporophyte. Cystocarps protrude slightly to both sides of the frond, and lack an ostiole. Spermatangia are unknown, and tetrasporangia are scattered. The genus was once the type of its own family, based on the mistaken impression that it was multiaxial, but Searles (1968) demonstrated its true structure and broadened the Cystocloniaceae to include genera with outwardly, rather than primarily inwardly, developing gonimoblasts.
Information contributed by: G.T. Kraft. The most recent alteration to this page was made on 7 Oct 2010 by M.D. Guiry.
Comments: Distribution: Endemic to southern Australia from the Geraldton region in the west to South Australia in the east, the plants occurring subtidally.
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: 14 January 2001 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43171
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 22 March 2019.