Hormotilopsis Trainor & H.C.Bold, 1954

Holotype species: Hormotilopsis gelatinosa Trainor & Bold

Original publication and holotype designation: Trainor, F.R. & Bold, H.C. (1954). Three new unicellular Chlorophyceae from soil. American Journal of Botany 40: 758-767.

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Description: Colonial pseudofilamentous, branching thalli with cells terminal in lamellate mucilaginous strands, either single or in groups of two or four. Cells spherical to ovoid, mostly 8-15 &m with some cells enlarged to 18 or 30 &m (H. gelatinosa and H. tetravacuolaris respectively). Cell walls smooth. Cells uninucleate with 2-4 contractile vacuoles, these becoming unclear in older cells. Chloroplast single and parietal with one basal pyrenoid surrounded in starch sheath. Asexual reproduction by autospores and zoospores; 2-4 per sporangium; released by rupture of sporangium. Zoospores with four equal, anterior flagella, 8-20 x .6-7 &m, ovoid to cylindrical with stigma. Details of zoospore ultrastructure described O'Kelly and others. Sexual reproduction unknown. Hormotilopsis isolated from soil; H. gelatinosa widely distributed (North America, former USSR, Japan), H. tetravacuolaris reported only from Cuba; both species available in culture from UTEX (strains 104 and 946). Species distinguished based on cell size and number of contractile vacuoles per cell. In previous tretaments genus assigned to Gloeodendraceae in Gloeodendrales (Ettl and Gärtner); more recently ultrastructural studies of H. gelatinosa and H. tetravacuolaris show similarities with Chaetopeltis and justify assignment to Chaetopeltidaceae. Phyllogloea considered distinct by O'Kelly and others based on ultratructural features, however, complete diagnosis not provided.

Information contributed by: D. Garbary. The most recent alteration to this page was made on 2012-01-26 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Most recent taxonomic treatment adopted: Burova, O.V., Tsarenko, P.M., Kovalenko, O.V., Petlovany, O.A., Mikhailyuk, T.I. & Lilitska, G.G. (2011). Chaetophorales. In: Algae of Ukraine: diversity, nomenclature, taxonomy, ecology and geography. Volume 3: Chlorophyta. (Tsarenko, P.M., Wasser, S.P. & Nevo, E. Eds), pp. 264-278. Ruggell: A.R.A. Gantner Verlag K.-G.

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

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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 26 January 2012. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 27 November 2024