Hormathonema Ercegovic, 1929

Holotype species: Hormathonema paulocellulare Ercegović

Original publication and holotype designation: Ercegovic, A. (1929). Sur quelques nouveaux types des Cyanophycées lithophytes de la côte adriatique. Archiv für Protistenkunde 66: 164-174, 3 figs.

Description: Unicellular-colonial; thallus composed of epilithic and endolithic pseudofilaments. Epilithic pseudofilaments form the irregular uni- or more-seriate rows or irregular groups of more or less spherical cells, which are enveloped by their own mucilaginous, sometimes widened and slightly lamellated envelopes; endolithic (boring) pseudofilaments grow directly into the limestone substrate and are composed of uniseriate rows of cells which are distant one from another, separated by thick, mucilaginous, usually crosswise lamellated layers; all pseudofilaments are enveloped by lamellated gelatinous, wide sheaths, sometimes colored, yellowish-brown or violet, sometimes divaricated ("branched"). Cells spherical, irregular or polygonal, slightly elongated in endolithic pseudofilaments, usually more widened at their ends. Cells divide irregularly in different planes, in pseudofilaments with prevailing crosswise binary fission. After division , they separate from one another and produce their own sheaths. Reproduction by solitary cells (monocytes) escaping from the mucilaginous sheaths, or by small gelatinous clusters of several cells. Nanocytes not observed. Marine; all species described from Mediterranean Sea; they occur on rocky limestone shores, probably more widespread. The genus must be, retypified and the generic name should be conserved in the sense of Ercegovi_ (1930, 1932) and, particularly, Le Campion and Golubi_ (1985).

Information kindly contributed by J. Komárek but may now be outdated.

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

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=44045

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 03 March 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 01 May 2024