Borzia Cohn ex Gomont, 1892

Holotype species: Borzia trilocularis Cohn ex Gomont

Original publication and holotype designation: Gomont, M. (1892 '1893'). Monographie des Oscillariées (Nostocacées Homocystées). Deuxième partie. - Lyngbyées. Annales des Sciences Naturelles, Botanique, Série 7 16: 91-264, pls 1-7.

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Description: Filamentous; solitary filaments or small groups of trichomes. trichomes with a limited growth, usually short (with up to 16 cells/trichome), 0.5-7 _m wide, uniseriate, unbranched, more or less straight or slightly curved, isopolar, not attenuated to the ends, mainly constricted, rarely unconstricted at the crosswalls. Sheaths lacking, sometimes (facultatively) with fine mucilage enveloping trichomes. All cells morphologically and functionally identical, isodiametric or slightly shorter or longer than wide, cylindrical to barrel-shaped, end cells widely rounded; thylakoids probably concentrically arranged along the cell walls. Heterocytes and akinetes missing. Reproduction by transverse cell division, all cells capable of division. Trichomes divide between vegetative cells without cell death, after they reach a distinct length (usually only with several cells). Trichome fragments nonmotile (hormocytes), isopolar, germinate at both ends. The different species occur in periphyton and metaphyton of clear, mainly small freshwater bodies with aquatic plants (3 species), epiphytically (endogloeic) in the mucilage of other freshwater algae (1), benthic in lakes (1) or aerophytic on calcareous substrates (2). Known mainly from Europe. Type species probably has cosmopolitan distribution, but not common.

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.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=43575

Citing AlgaeBase
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 22 November 2024