Symphyonemopsis G.L.Tiwari & A.K.Mitra, 1969

Holotype species: Symphyonemopsis katniensis G.L.Tiwari & A.K.Mitra

Original publication and holotype designation: Tiwari, G.L. & Mitra, A.K. (1969 '1968'). Symphyonemopsis katniensis gen. et sp. nov., a new member of the Myxophyceae. Phykos 7(1/2): 186-194.

Description: Filamentous - thallose; thallus wooly, in cushion-like patches, blue-green or brownish, with irregularly, densely coiled, branched filaments. Filaments slightly diversified in thicker main filaments and thinner branches, not polarized. Trichomes in main filaments cylindrical, constricted at crosswalls, usually with cells shorter than wide, rarely isodiametric or longer than wide, with numerous true branchings of reverse Y-type, occasionally with false branching, which starts usually after dissociation of trichomes at heterocytes; trichomes in branches more or less cylindrical, with cells shorter (during intense division) or longer than wide, without constrictions at crosswalls or with constrictions (regularly in segments from which hormocysts develop). Cells blue-green, with solitary prominent granules. Sheaths distinct, firm, hyaline, not lamellated, in hormocysts thick, dark brown, but also not lamellated. Heterocytes terminal ( in germinating hormocysts and after trichome dissociation) and intercalary, more or less spherical or shortly cylindrical, in branches cylindrical. Akinetes not found. Cell division crosswise to the trichome length. Reproduction by (3-13-celled) hormocysts, which arise at the ends of branches, solitary or to four in series; cells in hormocysts wider than in branches, constricted at crosswalls; during the germination of hormocysts, the single heterocytes usually develop (both heteropolar or isopolar germlings arise). The type species was described from the culture, isolated from paddy-field soil in India (Katni).

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.

Verification of Data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

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=44598

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 24 April 2024