Ulotrichella Berger-Perrot, 1981, nom. illeg.

Holotype species: Ulotrichella kornmannii (Berger-Perrot) Berger-Perrot

Currently accepted name for the type species: Chlorothrix kornmannii (Berger-Perrot) Berger-Perrot & J.C.Thomas

Original publication and holotype designation: Berger-Perrot, Y. (1981). Création du genre Ulotrichella nov. gen. (Chlorophycées, Ulotrichales). Revue Générale de Botanique 88: 83-86.

Description: Filaments free-floating, short, of 2-20 (or more) firmly adherent cells, uniseriate and unbranched, also with false branching often in form of intercalary loop consisting of up to 16 cells. Cells cylindrical, elongate and with polar vacuoles. Chloroplast single and equatorial, girdle-shaped with one pyrenoid. Multiplication of filaments by divisions of protoplast(s) inside common parental wall with end products forming new cell wall independent (?) of parental wall. Later, a miniature row of 2-8 cells enlarges, causing rupture of parental wall. Remnants of parental wall in form of caps wrapping rounded ends of daughter filaments. Asexual reproduction by quadriflagellate zoospores, 2-8 per cell, with stigma, escaping through hole in lateral cell wall. Ulotrichella planktonic in muddy rain water puddles in India. The false branching resulting in peculiar loop-like arrangements of cells, and vegetative multiplication via multiple protoplast cleavages makes the systematic position of Ulotrichella uncertain. Ultrastructural studies of wall development in daughter protoplasts, i. e. autospore formation, may clarify its position. Filaments free-floating, short, of 2-20 (or more) firmly adherent cells, uniseriate and unbranched, also with false branching often in form of intercalary loop consisting of up to 16 cells. Cells cylindrical, elongate and with polar vacuoles. Chloroplast single and equatorial, girdle-shaped with one pyrenoid. Multiplication of filaments by divisions of protoplast(s) inside common parental wall with end products forming new cell wall independent (?) of parental wall. Later, a miniature row of 2-8 cells enlarges, causing rupture of parental wall. Remnants of parental wall in form of caps wrapping rounded ends of daughter filaments. Asexual reproduction by quadriflagellate zoospores, 2-8 per cell, with stigma, escaping through hole in lateral cell wall. Ulotrichella planktonic in muddy rain water puddles in India. The false branching resulting in peculiar loop-like arrangements of cells, and vegetative multiplication via multiple protoplast cleavages makes the systematic position of Ulotrichella uncertain. Ultrastructural studies of wall development in daughter protoplasts, i. e. autospore formation, may clarify its position.

Information kindly contributed by G.M. Lokhorst but may now be outdated.

Taxonomic status: This name is currently regarded as a synonym of Chlorothrix.

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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=45004

Citing AlgaeBase
Cite this record as:
E.A. Molinari Novoa in Guiry, M.D. & Guiry, G.M. 11 March 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 24 April 2024