Holotype species: Cyanidium caldarium (Tilden) Geitler
Original publication and holotype designation: Geitler, L. (1933). Diagnosen neuer Blaualgen von den Sunda-Inseln. Arch. Hydrobiol. Suppl. 12: 622-634.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Yoon, H.S., Nelson, W., Lindstrom, S.C., Boo, S.M., Pueschel, C., Qiu, H. & Bhattacharya, D. (2016). Rhodophyta. In: Handbook of the Protists. (Archibald, J.M, Simpson, A.G.B. & Samovits, C.H. Eds), pp. [1-45]. Cham, Switzerland: Springer International Publishing.
Description: Spherical unicells, rarely united in a common mucilaginous matrix, 1.5-6 µm diam. and containing a blue-green, parietal, plate-like chloroplast without a pyrenoid. Reproduction by 4 endospores (2-3 µm). Sexual reproduction not reported.Chloroplast contains single, parallel, concentric thylakoids with phycobilisomes like other algae with predominant phycocyanin. One mitochondrion. Older cells with large vacuole but not log-phase cells. Cells grown in high CO2 form prominent starch grains.
Information contributed by: R.G. Sheath. The most recent alteration to this page was made on 6 Feb 2017 by M.D. Guiry.
Comments: Cosmopolitan in acid thermal areas. Temperature range in situ 13-57_C; optimum for growth 45_C. pH range in situ 0.05-5.0; optimum 2-3. Lower amounts of unsaturated fatty acids at higher temperatures. Osmoacclimation by floridoside and iso-floridoside, supporting red algal affinity. High-efficiency NO3- uptake system with possible proton cotransport. Grows on glucose in dark with reduction in pigments. Included in Cyanidiophyceae by Merola and others (1982) because chloroplast envelope appears to be a single membrane.
Numbers of names and species: There are 6 species names in the database at present, as well as 1 infraspecific names. Of the species names, 2 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..
Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):
Click here to also show infraspecific names in the list below.
Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.
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.
Created: 28 December 2000 by M.D. Guiry
Verified by: 06 February 2017 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=42892
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 22 March 2019.