Gastroclonium Kützing, 1843, nom. cons.
Holotype species: Gastroclonium ovale Kützing
Currently accepted name for the type species: Gastroclonium ovatum (Hudson) Papenfuss
Original publication and holotype designation: 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.
Taxonomic status: currently recognized as a distinct genus.
Gender: This genus name is currently treated as neuter.
Most recent taxonomic treatment adopted: Desvaux, N.A. (1809). Observations sur le genre Fluggea, Rich. (Slateria, Desv.). Journal de Botanique (Desvaux) 1(4): 243-246.
Description: Thallus with branched or discoid holdfast and fronds consisting of an erect solid terete stipe and erect or reflexed, terete or compressed deciduous branches sometimes short and vesicle-like, sometime longer and segmented by septa and filled with a watery mucilage, branching dichotomous or lateral and variable; multiaxial construction, branches filled with a watery mucilage, with a tubular inner cortex of large cells covered by an incomplete layer of smaller cells and lined inside by discrete, parallel longitudinal medullary filaments bearing inwardly-directed secretory cells and uniting with monostromatic septa between the segments. Gametangial plants dioecious, reproductive structures developing only on the mucilage-filled branches; spermatangia in superficial sori, terminal on elongated mother cells borne on branched filaments derived from cortical cells; procarpic, carpogonial branches 4-celled, with two 2-celled auxiliary cell branches, gonimoblast developing outwards, carposporangia large, wedge-shaped, developing directly from a large fusion cell, cystocarps protruding externally, cortex forming a thick pericarp without a pore, tela arachnoidea absent; tetrahedral tetrasporangia or polysporangia intercalary in cortical filaments, scattered in the younger parts.
Information contributed by: M.D. Guiry. The most recent alteration to this page was made on 24 Jan 2017 by M.D. Guiry.
Comments: Gastroclonium is very similar in structure and reproduction to Chylocladia, the only distinguishing feature being the presence of a solid stalk in the former and its absence in the latter; further studies may show that they are congeneric. Gastroclonium species occur in the north (type species) and south Atlantic, the Pacific coast of north America, Japan, China, and India. The genus is conspicuously absent from South Africa, Australasia and the south Pacific (Abbott & Hollenberg, 1976; Srinivasan 1960; Pujals 1967; Chang & Xia, 1976; Guiry & Irvine, 1983; Yoshida 1985; Hawkes & Scagel 1986). Many of the species, including the type, form polysporangia with 8 or 16 spores in place of, or together with, tetrasporangia (Guiry 1978, 1990). In the British Isles, most plants of G. ovatum shed the mucilage-filled branches in July and August; the solid parts then develop new vesicles in the following autumn and reproduction takes place on the new vesicles in the spring and early summer. Germination of spores takes place only at relatively low temperatures (Guiry unpublished data).
Numbers of names and species: There are 22 species names in the database at present, as well as 2 infraspecific names. Of the species names, 11 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: 24 January 2017 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=119
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 August 2019.