Chamaedoris Montagne, 1842
Holotype species: Chamaedoris annulata 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.
Request PDFDescription: 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 The life history was studied by Enomoto (unpublished) and is characterized by a biphasic, isomorphic alternation of generations.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 2021-11-15 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.
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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.
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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 15 November 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 22 November 2024
