Holotype species: Chamaedoris annulata (Lamarck) Montagne
Currently accepted name for the type species: Chamaedoris peniculum (J.Ellis & Solander) Kuntze
Original publication and holotype designation: Montagne, C. (1842). Troisième centurie de plantes cellulaires exotiques nouvelles. Décades V, VI, VII et VIII. Annales des Sciences Naturelles, Botanique, Seconde Série 18: 241-282, pl. 7.
Taxonomic status: currently recognized as a distinct genus.
Description: Thallus composed on one or more stipitate capitula, to 10 cm tall. Stipe prominent, aseptate, unbranched, conspicuously annulated, of uniform diameter throughout its length, 1-2 mm diameter, 1-5 c, tall. Apical, uniaxial orientation maintained throughout development. Capitulum orbicular, auticulate or oblong; composed of aseptate and secondarily septate, dichotomously and subdichotomously branched, filiform cells; 125-400 µm diameter. Septations in capitular cells commonly arising at base of each branch. Rhizoid well developed from which new stalks can arise. Adventitious rhizoids absent. Structural reinforcement of the capitulum primarily achieved by entanglement of siphons; secondarily by minute, determinate tenacular cells arising laterally between adjacent siphons. Capitulum initiated from 2-3 cells cut off at terminal end of stipe in which whorls of aseptate protrusions form, 4-6 buds per cell. Elongation and secondary branching to several others. Acropetal addition of whorls from central axis only. Cell division by segregative division- sensu stricto in stipe, immediately prior to capitular initiation; by centripetal invagination in capitular siphons and rhizoids. Cell multinucleate; chloroplasts multiple and discoid, each with single pyrenoid surrounded by starch sheath and traversed by multiple thylakoids. The life history was studied by Enomoto (unpublished) and is characterized by a biphasic, isomorphic alternation of generations. Diploid chromosome number of 24 reported for C. auriculata. Chamaedoris is a pantropic, marine genus. It may be locally abundant but is generally rather patchy in distribution. It favors areas of strong water motion and is generally found in sandy, low visibility habitats. The stipes may be heavily epiphytised by crustose coralline rhodophytes, and it is also not uncommon to find only the basal portions of the plants, i.e., lacking the capitulum altogether. The dendroid habit of Chamaedoris resembles Struvea and Apjohnia; however these genera have many distinguishing features and are unlikely to be confused. Phylogenetic data from immunological distance measurements suggest that Cladophoropsis is the sister genus to Chamaedoris.
Information contributed by: J.L. Olsen. The most recent alteration to this page was made on 29 Aug 2011 by M.D. Guiry.
Numbers of names and species: There are 5 species names in the database at present, of which 3 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: 29 August 2011 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=40961
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 20 February 2019.