Hydrocoryne Schwabe ex Bornet & Flahault, 1886
Holotype species: Hydrocoryne spongiosa Schwabe 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.
Request PDFDescription: Filamentous-thallose; filaments isopolar, contain one or more trichomes placed together and more or less parallel within one sheath, joined and coiled into the spreading, macroscopic, gelatinous to leathery, irregularly clathrate or compact, dirty green mat. Trichomes uniseriate, not branched (but after dissociation they remain parallel situated in the common sheath = similarity with false branching of Blennothrix or Coleodesmium), isopolar, of the same width along the whole trichome, without narrowed and elongated terminal cells, clearly constricted at crosswalls. Sheaths firm, more or less thin, structureless, colorless, limited, to 30 _m wide; sheaths with more trichomes sometimes divaricate, ramify and later split from one another, but remain in one thallus, more or less parallel and later irregularly arranged in one gelatinous mat. Cells barrel-shaped, longer or shorter than wide, pale blue-green. Heterocytes intercalary, barrel-shaped up to cylindrical. Akinetes solitary, always near heterocytes, elongated, ellipsoidal. Cells divide crosswise by binary fission; without meristematic zones, all cells capable of division. Reproduction probably by hormogonia. The type species known from stagnant freshwater swamps, pools and ponds with vascular submersed plants (forming mats on water plants, rarely secondary floating). Recorded from several very distant areas (Europe, India, Japan, S. Argentina), but never well documented; the validity of all these records should be confirmed.
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=44126
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 23 November 2024
