Docidium Brébisson ex Ralfs, 1848
Lectotype species: Docidium baculum Brébisson ex Ralfs
Original publication: Ralfs, J. (1848). The British Desmidieae The drawings by Edward Jenner, A.L.S. pp. [i]-xxii, [i], [1]-226, 35 pls. London: Reeve, Benham & Reeve, King William Street, Strand.
Request PDFType designated in: Guiry, M.D. (2013). Taxonomy and nomenclature of the Conjugatophyceae (=Zygnematophyceae). Algae. An International Journal of Algal Research 28: 1-29.
Description: Cells solitary, elongate-cylindric with straight or sides margins and smooth, truncate ends (rarely with ring of small granules around each semicell apex). Cells up to 26 times longer than broad, with shallow median constriction (isthmus) where semicell walls overlap. Plications or small granules on each side of isthmus diagnostic for genus. Cell wall with scattered pores and narrow gelatinous sheath. Chloroplast one per semicell, stellate in end view, with axial row of several pyrenoids. Nucleus in isthmus. Asexual reproduction by cell division and new semicell morphogenesis typical of Cosmarium-type desmids (see Cosmarium). Sexual reproduction unknown. Docidium cosmopolitan but usually rare; in acidic, oligotrophic lakes and ponds. D. baculum most widespread species.
Information contributed by: J.F. Gerrath. The most recent alteration to this page was made on 2024-02-01 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
Most recent taxonomic treatment adopted: Guiry, M.D. (2013). Taxonomy and nomenclature of the Conjugatophyceae (=Zygnematophyceae). Algae. An International Journal of Algal Research 28: 1-29.
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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera,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.
Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=43530
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 01 February 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 22 November 2024
