Homoeothrix (Thuret ex Bornet & Flahault) Kirchner, 1898, nom. cons.
Holotype species: Calothrix juliana Bornet & Flahault ex Gomont
Currently accepted name for the type species: Homoeothrix juliana (Gomont) Kirchner
Original publication and holotype designation: Kirchner, O. (1898). Schizophyta: Schizophyceae. In: Die natürlichen Pflanzenfamilien. (Engler, A. & Prantl, K. Eds) Vol. 1(1), pp. 45-92, figures 48-62. Leipzig: Wilhelm Engelmann.
Description: Filamentous; filaments solitary or in groups, heteropolar, attached with one end to the substrate (usually by a mucilaginous pad) and with free second end, erected or irregularly waved and creeping on the substrate, with simple, firm, thin sheath enveloping the trichome and open at the apex, colourless or coloured (yellow-brown, violet). Trichomes up to 15 um wide at the base, uniserial, simple, +/- straight or waved, from the widened base continually attenuated to the ends up to a thin cellular hair (subg. Homoeothrix), or thin and cylindrical along the greatest part of a trichome and at the end hair-like elongated (Subg. Tapinothrix; probably different genera); at crosswalls usually constricted, rarely unconstricted; rarely false branching with one lateral branch, after division at necridic cells or between two vegetative cells (7; different genera 7). Cells shorter than wide or more or less isodiametric, rarely longer than wide before cell division, cylindrical or barrel-shaped, usually pale blue-green, olive-green or greyish, rarely (in large species) blue-green, without aerotopes; hair cells usually vacuolized. Heterocytes and akinetes absent.
Information contributed by: J. Komárek. The most recent alteration to this page was made on 2023-03-03 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.
Comments: All species are known from submerged biotopes. The majority of species grow on stones (on the upper or bottom sides) or epiphytic in streams (particularly in mountain creeks), in tarns, less on different substrates in other stagnant waters. One species is marine, few live endogloeic within mucilage of other algae. Almost all species are known from geographically limited areas.
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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.
Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=43615
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 03 March 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 02 October 2023