Chamaesiphon A.Braun, 1864, nom. cons.

Holotype species: Chamaesiphon confervicola A.Braun

Original publication and holotype designation: Rabenhorst, L. (1864). Flora europaea algarum aquae dulcis et submarinae. Sectio I. Algas diatomaceas complectens, cum figuris generum omnium xylographice impressis. pp. 1-359. Lipsiae [Leipzig]: Apud Eduardum Kummerum.

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Description: Unicellular; solitary, more or less elongated cells or groups of cells joined to the substrate /subg. Chamaesiphon/, or forming microscopic shrub-like colonies or layered, narrow mats with densely and parallel gathered cells on stones or submerged plants, perpendicularly oriented to the substrate /subg. Godlewskia (Janczewski)Geitler 1925/. Cells always polarized, joined to the substrate with one (basal) end by means of a small mucilaginous pad (cells without pads occur only in upper parts of multilayered colonies); cells oval, cylindrical or club-shaped, rounded at the apex. Around cells mucilaginous sheaths, fine and diffluent of firm and lamellated; the sheaths open at the apex during the division process (pseudovaginae). Cell content gray, blue-green or pinkish, usually finely granular, always without aerotopes. Thylakoids localized peripherally, Å concentrically, sometimes, moreover, with several central localized, coiled thylakoids. Cells divide by the transverse fission, usually asymmetrically near the apex; sometimes develop the apical daughter cells (exocytes). Cell division at the apical end can repeat several times. Exocytes are motile and join to the end of opened pseudovaginae or separate completely from the mother cell and attach to the substrate. Only freshwater species growing sessile on aquatic plants, on other algae and on stones, on which they cause sometimes colored (yellow, brown, blackish violet) spots. One species is epizoic on planktonic crustaceans. Many species have limited geographic distributions; they are characteristic mainly for communities of periphytic algae in mountain creeks (the Alps, The Carpathians, etc.) However, the genus occurs worldwide (different species in different frequencies)

Information contributed by: J. Komárek. The most recent alteration to this page was made on 2015-03-05 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Gender: This genus name is currently treated as masculine.

Most recent taxonomic treatment adopted: Komárek, J., Kaštovský, J., Mares, J. & Johansen, J.R. (2014). Taxonomic classification of cyanoprokaryotes (cyanobacterial genera) 2014, using a polyphasic approach. Preslia 86: 295-335.

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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.

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 05 March 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 19 July 2024

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