Dumontia J.V.Lamouroux, 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.

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Type designated in: Schmitz, F. (1889). Systematische Übersicht der bisher bekannten Gattungen der Florideen. Flora oder Allgemeine botanische Zeitung 72: 435-456, pl. XXI.

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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 2017-01-23 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.

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.

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).

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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.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=113

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 23 January 2017. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 09 February 2023

 
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