Capsosira Kützing ex Bornet & Flahault, 1886

Holotype species: Capsosira brebissonii Kützing ex Bornet & Flahault

Original publication and holotype designation: Bornet, É. & Flahault, C. (1886 '1887'). Revision des Nostocacées hétérocystées contenues dans les principaux herbiers de France (Troisième fragment). Annales des Sciences Naturelles, Botanique, Septième série 5: 51-129.

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Description: Thallose; thallus attached to the substrate, cushion-like, hemispherical or prostrate, to several nm high, brownish or blackish, gelatinous, later confluent from more subcolonies, in the middle sometimes Å concentrically layered, composed from basal, irregular, densely tangled trichomes (sometimes joined in a dense irregular cell mass - "chroococcal" stages), from which grow long, erect, parallel and densely gathered, radially oriented, true branched trichomes, with numerous, repeatedly pseudodichotomously (rarely laterally) divaricated branches, growth Å in the same radial direction. Branching types "V" and "T". Trichomes uniseriate, constricted at crosswalls. Sheaths fine, thick, not or sometimes slightly lamellated, firm or diffluent, colorless or yellowish brown. Cells subspherical, barrel-shaped, rounded-quadratic or rounded-polygonal, with blue-green content. Heterocytes intercalary or lateral, Å ellipsoidal, with colorless or yellowish cell wall. Akinetes arise sporadically in basal parts, with firm, thick, brown cell wall. Cell division in branches mainly transverse, less lengthwise (before branching and sometimes before heterocyte formation), in basal parts usually irregularly in more directions. Reproduction by terminal hormogonia (2- up to 20-celled) differentiating from the ends of branches, and by terminally liberating monocytes. The type species was described from Europe, later found in various places worldwide including tropical countries, but recently not confirmed; it occurs attached to aquatic plants, stones and submerged wood in swamps and on wet rocks (identity of all these samples dubious). Another species was described from Brazil (epiphytic on Stigonema and Bactrachospermum on submerged rocks in clean running water).

Information contributed by: J. Komárek. The most recent alteration to this page was made on 2023-03-06 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 feminine.

Most recent taxonomic treatment adopted: Strunecký, O., Ivanova, A.P. & Mares, J. (2022 '2023'). An updated classification of cyanobacterial orders and families based on phylogenomic and polyphasic analysis (Review). Journal of Phycology 59(1): 12-51.

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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=43574

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 06 March 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 28 March 2024

 
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