Symphyonema C.-C.Jao, 1944

Holotype species: Symphyonema sinense C.-C.Jao

Original publication and holotype designation: Jao, C.-C. (1944). Studies on the fresh-water algae of China. XIII. New Myxophyceae from Kwangsi. Sinensia 15: 75-90, pls 1, 2.

Description: Filamentous - thallose; thallus pulvinate, woolly, to 1.5 cm thick, greyish blue with many densely coiled or more or less parallel arranged filaments, sometimes joined in erect fascicles. Filaments irregularly branched, not distinctly morphologically diversified in basal sections and branches. Trichomes uniseriate, probably isopolar, with cells rarely shorter or (usually) longer than wide, cylindrical, not constricted or slightly constricted at crosswalls, not attenuated towards the ends, with rounded terminal cells. Branching of two types, true or reverse Y-type, and false, scytonematoid; branching initiates always distant from heterocytes (reverse Y-branching originates always from special oblong cells, located between two shortened cells, containing densely granular and deeply colored content; later the oblong cell lengthwise divides and new cells elongate). Sheaths firm, limited, homogeneous or slightly lamellated, brownish in old parts. Cells blue-green, with slightly granular content. Heterocytes intercalary, more or less cylindrical, solitary. Akinetes not observed. Cell division crosswise to the trichome length. Reproduction by hormogonia, separating from ends of branches. Aerophytic species, described from wet calcareous rocks in south China (Kwangsi).

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 neuter.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=46310

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 April 2024