Parenchymorpha C.K.Tseng & M.Hua, 1984

Holotype species: Parenchymorpha xishanica C.K.Tseng & M.Hua

Original publication and holotype designation: Zeng Chenghui & Hua Maosen [Tseng, C.K. & Hua, M.S.] (1984). Parenchymorpha xishanica, a new cyanophyte from Xisha Islands of China. Scientia Sinica, Series B 27(8): 811-817.

Description: Filamentous-thallose; thallus attached, heterotrichous, with filaments originally creeping on the substrate, without or with very fine, colorless, unstructured and diffluent sheath (visible usually only in the upper parts of filaments). Trichomes uniseriate, flexuous clearly constricted at crosswalls, commonly true pseudodichotomously branched (T-, V- and indistinct reverse Y-type), towards the apices continually attenuated into the long, cellular, cylindrical, thin, hair-like ends. In the center of old colonies arise from coalesced filaments pseudoparenchymatous flat, cellular discs with one layer of cells, adhering firmly to the substrate, from which radially arise repeatedly branched filaments, oriented more or less parallel, free upon the substrate. Cells more or less barrel-shaped to irregular. Heterocytes missing. Akinetes arise in short disintegrating rows, spherical or subspherical, larger than vegetative cells. Cells divide crosswise or lengthwise (irregularly) before branching and in pseudoparenchymatous discs. Reproduction by hormogonia and germinating akinetes. Hormogonia separate from trichomes by help of necridic cells. Marine; creeping on the gelatinous membranous outgrowth of Strombus-shell. Known only from the littoral of Xisha Islands, South China Sea.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=47371

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 18 May 2024