Lectotype species: Colaconema bonnemaisoniae Batters
Original publication:Batters, E.A.L. (1896). Some new British marine algae. Journal of Botany, British and Foreign 34: 6-11.
Type designated in Papenfuss, G.F. (1945). Review of the Acrochaetium-Rhodochorton complex of the red algae. University of California Publications in Botany 18: 229-334.
Taxonomic status: currently recognized as a distinct genus.
Gender: This genus name is currently treated as neuter.
Most recent taxonomic treatment adopted: Harper, J.T. & Saunders, G.W. (2002). A re-classification of the Acrochaetiales based on molecular and morphological data, and establishment of the Colaconematales, ord. nov.. British Phycological Journal 37: 463-475.
Lectotype selected by Papenfuss (1945: 304). - (20 Jan 2017) - M.D. Guiry
Although Harper & Saunders (2002) did not use the type species (C. bonnemaisonia) in their investigations, they note that most authors agree that C. asparagopsis (the species studied) and C. bonnemaisonia are exceedingly similar in almost every respect and they consider their sample representative of the genus Colaconema. - (7 Jul 2011) - Wendy Guiry
Description: Plants uniseriate filamentous, ecorticate, in general of small dimensions, up to 10 mm high. Cells with one parietal chloroplast and a single pyrenoid, rarely several lobed parietal chloroplasts with one pyrenoid each. Life histories, where known, involving 2 free-living phases; generations isomorphic or slightly heteromorphic, but in some species markedly heteromorphic; gametophytes usually with a persistent spore, via bipolar germination producing a multicellular filamentous basal part on one side and one or a few erect axes on the other side; base remaining unicellular in a minority of species. Tetrasporophytes with a non-persistent spore producing a prostrate multicellular filamentous part, the latter giving rise to erect axes. Branching of erect axes irregular, secund or opposite. Occasional occurrence of multicellular pseudohairs. Sexual plants monoecious or dioecious. Spermatangia in clusters of various shapes. Carpogonia sessile or pedicellate, distinct carpogonial filament absent. Development of carposporophyte direct; fertilized carpogonium dividing transversely, developing small filamentous gonimoblasts with terminal carposporangia. Sterile involucre absent. Tetrasporangia lateral or terminal on axes and laterals, single or in clusters, cruciately divided. Monosporangia produced in both generations, and in many species the only known mode of reproduction. Worldwide, virtually exclusively marine, most diversified in tropical to warm temperate areas. Plants rarely epilithic, often epiphytic, also epizoic (semi-)endophytic and (semi-)endozoic. Emended by J.T. Harper & G.W. Saunders.
Information contributed by: H. Stegenga. The most recent alteration to this page was made on 9 Jul 2019 by M.D. Guiry.
Numbers of names and species: There are 77 species names in the database at present, as well as 2 infraspecific names. Of the species names, 52 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: 09 July 2019 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=42664
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 01 October 2020.