Sirodotia, 1912: 38
Holotype species: Sirodotia suecica Kylin
Original publication and holotype designation:Kylin, H. (1912). Studien über die Schwedischen Arten der Gattungen Batrachospermum Roth und Sirodotia nov. gen. Nova Acta Regiae Soc. Sci. Ups. Ser. IV, 3: 1-40.
Taxonomic status: currently recognized as a distinct genus.
Gender: This genus name is currently treated as feminine.
Description: Attached, gelatinous gametophytic filaments, up to 17 cm long, with a beaded appearance varying from blue-green to yellow-green. Uniseriate central axis with large, cylindrical cells; 4-6 pericentral producing repeatedly branched fascicles of limited growth. In most species, rhizoid-like cortical filaments from lower side of pericentral cells. Each fascicle cell contains several, ribbon-like, parietal chloroplasts with no pyrenoid. Spermatangia budded off terminal fascicle cells, spherical, colorless, 4-7 µm diam. Little differentiated carpogonial branches with small cells. Carpogonia with broad trichogyne attached off-center to base, latter structure having a definite protrusion. Carposporophyte a branched filament creeping along main axis; carposporangia formed at branch apices. Carpospores germinate into chantransia (= pseudochantransia) stage, composed of branched, uniserate filaments. Meiosis and monosporangia not observed. Cell structure typical of florideophytes. One strain of S. tenuissima has virus-like particles (UTEX LB 1499).
Comments: In scattered, small, typically softwater streams in temperate to tropical environments. The most widespread, S. suecica, has little increase in drag with increasing current velocity (20-80 cm s-1) due to branch reconfiguration. S. delicatula widely distributed in Brazil. Considered to be a section of Batrachospermum by Necchi and Entwisle (1990) but questioned by Necchi and others (1993). Day et al. (1995: 249) record this genus as being a synonym of Batrachospermum.
NCBI Nucleotide Sequences
Numbers of names and species: There are 21 species (and infraspecific) names in the database at present, of which 10 have been flagged as currently accepted taxonomically.
Names: ('C' indicates a name that is currently 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):
Sirodotia acuminata Skuja ex L.Flint S
Sirodotia ambigua Skuja ex T.J.Entwisle S
Sirodotia angolensis (West & G.S.West) Skuja C
Sirodotia ateleia Skuja S
Sirodotia ateleia var. australis Skuja ex T.J.Entwisle C
Sirodotia cirrhosa Skuja ex M.S.Balakrishnan & B.B.Chaugule C
Sirodotia delicatula Skuja C
Sirodotia fennica Skuja S
Sirodotia gardneri Skuja ex L.Flint C
Sirodotia goebelii Entwisle & Foard S
Sirodotia huillensis (Welwitsch ex West & G.S.West) Skuja C
Sirodotia iyengarii Balusami & Babu C
Sirodotia loefgrenii Skuja C
Sirodotia nigrescens (West & G.S.West) Skuja S
Sirodotia polygama Skuja ex L.H.Flint C
Sirodotia segawae S.Kumano C
Sirodotia sinica C.-C.Jao C
Sirodotia suecica Kylin C - type
Sirodotia suecica var. australis Skuja ex T.J.Entwisle C
Sirodotia tenuissima (F.S.Collins) Skuja ex L.H.Flint S
Sirodotia yutakae S.Kumano C
Lam, D.W., Entwisle, T.J., Eloranta, P., Kwandrans, J. & Vis, M.L. (2012). Circumscription of species in the genus Sirodotia (Batrachospermales, Rhodophyta) based on molecular and morphological data. European Journal of Phycology 47(1): 42-50.
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.
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=42773
Cite this record as:
Guiry, M.D. & Guiry, G.M. 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 09 December 2013.
Algaebase taxon LSID: urn:lsid:algaebase.org:taxname:7479