Iyengariella Desikachary, 1953

Holotype species: Iyengariella tirupatiensis Desikachary

Original publication and holotype designation: Desikachary, T.V. (1953). Iyengariella tirupatiensis gen. et sp. nov. from South India. Phytomorphology 3: 249-253.

Description: Filamentous - thallose; thallus attached in tufts, composed of basal, pseudodichotomously branched, coiled and more or less prostrate filaments and upper unbranched, free, erect filaments arising from lower trichomes after true branching. Trichomes uniseriate, composed of cylindrical cells in young and apical trichome parts and of barrel-shaped cells in older trichomes; trichomes are true branched (typical reverse Y-type, less frequently lateral T-type); young trichomes and branches are continually attenuated to the ends, forming cellular, cylindrical, narrow and long hairs with elongated cells. Sheaths present, wide, colorless, enclosing one or more trichomes, in lower parts lamellated, divergent. Cells shorter than wide in lower trichomes and up to 10 times longer than wide in hairs. Heterocytes absent, akinetes arise in short rows at old parts of trichomes, subspherical, a little larger than vegetative cells, with thickened, dark cell wall. Cells divide crosswise, particularly in indistinct, short, meristematic zones. Reproduction by hormogonia, which separate from trichomes with the help of necridic cells. Submersed and epilithic in running water, known only from mountain creeks in India.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=45686

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 April 2024