Dudresnaya P.Crouan & H.Crouan, 1835, nom. et typ. cons.
Lectotype species: Dudresnaya coccinea (C.Agardh) P.Crouan & H.Crouan
Currently accepted name for the type species: Dudresnaya verticillata (Withering) Le Jolis
Original publication and holotype designation: Crouan, P.L. & Crouan, H.M. (1835). Observations microscopique sur le genre Mesogloia Agardh. Annales des Sciences Naturelles, Botanique 9: 98-100.
Description: Cylindrical to complanate, soft, lubricous, or firmly gelatinous, irregularly branched to 2-4, usually progressively narrower orders. Sometimes annulate. Medulla of many slender filaments or a single, stout filament. Each axial cell bearing 2-7 cortical fascicles of subdi-, -trichotomously branched filaments of progressively narrower or smaller subcylindrical or subspherical cells. Rhizoidal filaments present. Secondary pit connections and cuticle absent. Cells uninucleate. Hairs sometimes present. Pit plugs lacking cap layers. Monoecious or dioecious. Carpogonium terminating a long adventitious filament, slightly distally recurved, unbranched or with one-few proximal, unbranched laterals. Fertilized carpogonium dividing and contacting one to three other cells of filament three or four cells below it; connecting filaments issuing from fusion process, contacting a succession of differentiated auxiliary cells in separate, adventitious filaments, which terminate like a vegetative filament. Several (two or three) gonimoblast initials arising from connecting filament attached to auxiliary cell, forming a usually compact, embedded cystocarp, in which essentially all cells mature into carposporangia. Carposporangia small. Spermatangia in terminal clusters on outer cells of cortical fascicles or in whorls around short, lateral, cortical branches. Tetrasporophyte isomorphic (tetrasporangia zonate, attached basally), or tetrasporophyte heteromorphic (tetrasporangia cruciate). Spore germination: diprotocellular--one division within wall of spore, then producing one or more rhizoid-like filaments, which subsequently branch distichously.
Information contributed by: S.C. Lindstrom. The most recent alteration to this page was made on 2022-11-02 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: A subtidal genus of tropical, subtropical and warm temperate seas around the world, can be epilithic, epiphytic or epizoic. Usually a (late winter-) spring-summer (-early fall) ephemeral.
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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=112
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 02 November 2022. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 03 December 2022