Botrydium Wallroth, 1815: 153
Holotype species: Botrydium argillaceum Wallroth
Original publication and holotype designation:Wallroth, K.F.G. (1815). Annus Botanicus, sive supplementum tertium ad Curti Sprengelii Floram Halensem 1815. pp. [i]-xxx, 1-194, pls I-VI. Halae [Halle]: Sumptibus Car. Aug. Kümmelii.
Taxonomic status: currently recognized as a distinct genus.
Description: Globose aerial portion, 1-2 mm in diam., subtended by colorless rhizoidal siphons which penetrate soil. Outer wall of aerial structure toughened, thin peripheral layer of cytoplasm with many nuclei and discoid chloroplasts. Rhizoidal siphons little or profusely branched, without chloroplasts but with many nuclei. Asexual reproduction by cell contents cleaving into uni- or multinucleate protoplasts, rounding up and secreting wall to form aplanospores, or entire cytoplasm forming a single-walled cyst. Hypnospores formed by any portion of cell separated by wall. In sexual reproduction entire cell can divide to form many (? about 40,000) heterokont-flagellated, pyriform zooids which fuse isogamously or anisogamously to form zygotes. Zooid also can develop parthenogenetically without fusing. The zygote develops directly into vegetative thallus. Botrydium is common and widespread, terrestrial on muddy banks of streams and ponds or on bare soil. Usually abundant and hiding underlying soil. Frequently encrusted with calcium carbonate.
NCBI Nucleotide Sequences
Numbers of names and species: There are 13 species (and infraspecific) names in the database at present, of which 11 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):
Botrydium argillaceum Wallroth C - type
Botrydium becherianum Vischer C
Botrydium corniforme Wodenitscharov C
Botrydium cystosum Vischer C
Botrydium divisum Iyengar C
Botrydium granulatum (Linnaeus) Greville C
Botrydium granulatum var. kolkwitzianum Vischer C
Botrydium milleri Wodenitscharov C
Botrydium pachydermum Miller C
Botrydium stoloniferum Mitra C
Botrydium tuberosum Iyengar C
Botrydium vulgare Pascher S
Botrydium wallrothii Kützing C
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=43813
Cite this record as:
Guiry, M.D. & Guiry, G.M. 2014. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 08 March 2014.
Algaebase taxon LSID: urn:lsid:algaebase.org:taxname:6742