Dumontia J.V., 1813
Lectotype species: Dumontia incrassata (O.F.Müller) J.V.Lamouroux
Currently accepted name for the type species: Dumontia contorta (S.G.Gmelin) Ruprecht
Original publication:Lamouroux, J.V.F. (1813). Essai sur les genres de la famille des Thalassiophytes non articulées. Annales du Muséum d'Histoire Naturelle, Paris 20: 21-47, 115-139, 267-293, pls 7-13.
Type designated in Schmitz, F. (1889). Systematische Übersicht der bisher bekannten Gattungen der Florideen. Flora oder Allgemeine botanische Zeitung 72: 435-456, pl. XXI.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Schneider, C.W. & Wynne, M.J. (2007). A synoptic review of the classification of red algal genera a half a century after Kylin's "Die Gattungen der Rhodophyceen". Botanica Marina 50: 197-249.
Dedicated to "... mon respectable ami M.Ch. Dumont, l'un des auteurs du Dictionnaire d'histoire naturelle." This is Charles Henri Frédéric Dumont de Sainte-Croix (1758-1830), "Il est le beau-père du naturaliste René Primevère Lesson (1794-1849), du conseiller de préfecture Charles Lamouroux (1798-1877), frère du biologiste Jean Vincent Félix Lamouroux, et du général Octave Claude Emile Perrodon (1794-1872)" (see Wikipedia). - (26 Aug 2006) -
Description: Cylindrical to complanate, branched to one (rarely two) orders, or spathulate-oblanceolate and unbranched. Gelato-cartilaginous. Medulla multiaxial, filamentous, mostly empty. Branches, when present, with a single axial filament. Cortex of progressively smaller, nearly spherical cells. Rhizoids rare. Cuticle poorly developed. Cells uninucleate. Pit plugs lacking cap layers. Dioecious. Carpogonium terminating a usually unbranched, adventitious filament; connecting filaments issuing from fusion process, contacting a succession of differentiated auxiliary cells in separate, adventitious filaments. Usually three gonimoblast initials arising from remnant of connecting filament attached to auxiliary cell. Cystocarp embedded, relatively few-celled (ca 24). All cells maturing into carposporangia. Spermatangia superficial, cut off by oblique walls. Tetrasporophyte isomorphic. Tetrasporangia large, cruciate, attached basally or subbasally to inner cortical cells.
Information contributed by: S.C. Lindstrom. The most recent alteration to this page was made on 23 Jan 2017 by M.D. Guiry.
Comments: Upright thallus initiation from basal crust initials requiring short photoperiod and low temperature. (Rietema, 1982; Rietema and Breeman, 1982; Rietema and Klein, 1981). Dumontia contorta has been used in northern Japan in making an adhesive (Tokida, 1954). A spring (-summer) ephemeral of the cool temperate waters of the northern hemisphere: Korea, Japan, USSR, Alaska, North Atlantic (eastern Canada and US, Iceland, Europe).
Numbers of names and species: There are 32 species names in the database at present, as well as 6 infraspecific names. Of the species names, 6 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: 23 January 2017 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=113
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 18 November 2019.