Romeria M.Koczwara, 1932

Lectotype species: Romeria leopoliensis (Raciborski) Koczwara

Original publication and holotype designation: Geitler, L. (1932). Cyanophyceae. In: Kryptogamen-Flora von Deutschland, Österreich und der Schweiz. Ed. 2. (Rabenhorst, L. Eds) Vol. 14, pp. 673-1196, i-[vi]. Leipzig: Akademische Verlagsgesellschaft.

Description: Filamentous and pseudofilamentous; trichomes solitary or rarely in microscopic colonies, free-floating, fine, few-celled, disintegrating to solitary cells, unbranched, irregularly to screw-like coiled, with sometimes freely connected cells by their ends, enveloped usually by very fine, diffluent, colorless, slightly visible mucilaginous envelopes (staining !), always without sheaths, isopolar, 0.6-3 _m wide, constricted at the cross walls, not attenuated at the ends, immotile. Cells elongated, cylindrical, always longer than wide (usually several times), cut or rounded at the ends, without aerotopes; end cells cut or rounded, without thickened cell walls or calyptras. Cell content pale blue-green, greyish or yellowish, usually homogeneous, thylakoids localized peripherally (as known). Heterocytes and akinetes absent. Cell division by symmetrical (under suboptimal conditions asymmetrical) crosswise binary fission, always perpendicularly to the longer axis of cells; daughter cells grow Å to the original size before next division. All cells capable of division. Reproduction by the easy trichome fragmentation to solitary cells within enveloping mucilage, without necridic cells, and by the dissociation of mucilaginous clusters with solitary cells or by trichome fragments.

Information contributed by: J. Komárek. The most recent alteration to this page was made on 2023-06-21 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.

Comments: Mainly planktonic species, usually from large, oligo- to mesotrophic or slightly eutrophic reservoirs, lakes and ponds, rarely (R. simplex) from the hypertrophic pond; one species is known from marine plankton (Gulf of Mexico), where it grows sometimes joined by one end to detritus. Majority of freshwater planktonic species known only from northern temperate zone.

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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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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 21 June 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 27 May 2024

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