Chondracanthus Kützing, 1843
Lectotype species: Chondracanthus chauvinii (Bory) Kützing
Original publication:Kützing, F.T. (1843). Phycologia generalis oder Anatomie, Physiologie und Systemkunde der Tange. Mit 80 farbig gedruckten Tafeln, gezeichnet und gravirt vom Verfasser. pp. [part 1]: [i]-xxxii, -142, [part 2:] 143-458, 1, err.], pls 1-80. Leipzig: F.A. Brockhaus.
Type designated in Setchell, W.A. & Gardner, N.L. (1933). A preliminary survey of Gigartina, with special reference to its Pacific North American species. University of California Publications in Botany 17: 255-339, Plates 46-65.
Precise date of publication14-16 Sept 1843
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Hughey, J.R. & Hommersand, M.H. (2008). Morphological and molecular systematic study of Chondracanthus (Gigartinaceae, Rhodophyta) from Pacific North America. Phycologia 47: 124-155.
Description: Thalli composed of one or more erect axes from a discoid or crustose holdfast, the erect axes initially cylindrical and either remaining cylindrical or becoming compressed or flattened; axes repeatedly pinnately branched or foliaceous and either simple or basally or marginally proliferous, often bearing numerous vegetative or reproductive branchlets, or sparsely to thickly covered by vegetative or reproductive papillae. Growth multiaxial by means of apical and marginal meristems and consisting of files of outwardly directed branched cortical filaments overlying an internal network of medullary filaments. Primary medullary filaments initially elongating longitudinally and connecting laterally and basally by one- to several-celled secondary filaments to form a loose meshwork composed of narrow to broad cells that are often flattened in the plane of the blade. Gametophytes dioecious or monoecious. Spermatangia formed in superficial sori on fertile branchlets, pinnules or papillae. Procarps initiated near apex on branchlets, pinnules or papillae and consisting of a supporting cell modified from an inner cortical cell that bears a 3-celled carpogonial branch; supporting cell functioning as the auxiliary cell; auxiliary cell forming few protrusions and gonimoblast initials from the inner side, surrounded by a compact envelope often divisible into inner vacuolate and outer cytoplasm-rich layers; gonimoblast filaments penetrating inner layer of envelope and linking to envelope cells by secondary pit connections late in cystocarp development; carposporangia borne in short chains interspersed among sterile gonimoblast filaments and enlarged envelope cells; terminal tubular gonimoblast cells fusing with cells of outer envelope; pericarp and ostiole sometimes present, formed early in cystocarp development by resumed growth of cortical filaments. Tetrasporangial sori small to large, sometimes nemathecial, localized in inner cortex; tetrasporangia in simple or branched chains, transformed from cells in primary cortical filaments; secondary tetrasporangial filaments absent; tetraspores released by gelatinous extrusion through pores in outer wall.The most recent alteration to this page was made on 16 Mar 2016 by M.D. Guiry.
Numbers of names and species: There are 28 species names in the database at present, as well as 3 infraspecific names. Of the species names, 22 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.
Hommersand, M.H., Guiry, M.D., Fredericq, S. & Leister, G.L. (1993). New perspectives in the taxonomy of the Gigartinaceae (Gigartinales, Rhodophyta). Proceedings of the International Seaweed Symposium 14: 105-120, 41 figs.
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
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=110
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 21 September 2020.