153,622 species and infraspecific names are in the database, 20,981 images, 59,421 bibliographic items, 412,629 distributional records.

Botrydium Wallroth, 1815

Classification:
Empire Eukaryota
Kingdom Chromista
Phylum Ochrophyta
Class Xanthophyceae
Order Botrydiales
Family Botrydiaceae

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.
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Ott, D.W. & Oldham-Ott, C.K. (2003). Eustigmatophyte, Raphidophyte, And Tribophyte. In: Freshwater Algae of North America, Ecology and Classification. (Wehr, J.D. & Sheath, R.G. Eds), pp. 423-470. San Diego: Academic Press.

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.

Information contributed by: T. J. Entwisle. The most recent alteration to this page was made on 1 Jun 2015 by Salvador Valenzuela Miranda.

Numbers of names and species: There are 16 species names in the database at present, as well as 7 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.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

Contributors
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: 11 April 2002 by M.D. Guiry

Verified by: 01 June 2015 by Salvador Valenzuela Miranda

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43813

Citing AlgaeBase
Please cite this record as:
Salvador Valenzuela Miranda in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 20 November 2018.

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