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.
Most recent taxonomic treatment adopted: Sheath, R.G. (2003). Red Algae. In: Freshwater Algae of North America, Ecology & Classification. (Wehr, J.D. & Sheath, R.G. Eds), pp. 197-224. San Diego: Academic Press.
Monotypic when first introduced. - (1 Feb 2017) - M.D. Guiry
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).The most recent alteration to this page was made on 5 Oct 2010 by M.D. Guiry.
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.
Numbers of names and species: There are 20 species names in the database at present, as well as 2 infraspecific names. Of the species names, 11 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.
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.
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
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=42773
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 19 May 2019.