163,469 species and infraspecific names are in the database, 22,770 images, 62,968 bibliographic items, 480,353 distributional records.

Peyssonnelia Decaisne, 1841

Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Rhodymeniophycidae
Order Peyssonneliales
Family Peyssonneliaceae

Lectotype species: Peyssonnelia squamaria (S.G.Gmelin) Decaisne ex J.Agardh

Original publication:Decaisne, J. (1841). Plantes de l'Arabie Heureuse, recueillies par M. P.-E. Botta et décrites par M. J. Decaisne. Archives du Muséum d'Histoire Naturelle, Paris 2(2): 89-199, pls V-VII.
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Type designated in Decaisne, J. (1842). Mémoire sur les corallines ou polypiers calcifères. Annales des Sciences Naturelles, Botanique, Seconde Série 18: 96-128.
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Taxonomic status: currently recognized as a distinct genus.

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Huisman, J.M. (2018). Algae of Australia. Marine benthic algae of north-western Australia. 2. Red algae. pp. [i]-xii, 1-672, 189 figs. Canberra & Melbourne: ABRS & CSIRO Publishing.

Nomenclatural notes
Accoding to ING, "Decaisne (1842) was the first author to use one of the two alternative original spellings consistently and thus selected Peyssonnelia as the correct one." - (30 Aug 2011) - M.D. Guiry

Description: Thallus dark red or purple to pinkish or yellowish green, uniformly coloured or variously patterned, often with concentric lines and/or radial streaks. Blades dorsiventral, mostly prostrate and crustose, some species tightly adherent, others loosely attached or with assurgent margins. Attachment to the substratum by unicellular or multicellular rhizoids without haptera. Structure with a dorsal perithallus of assurgent filaments arising from a monostromatic basal hypothallial layer, with or without non-rhizoidal ventral cells. Thallus usually ±calcified externally across the ventral surface, occasionally also internally within the cell wall matrix; cystoliths present in some species. Reproductive structures in nemathecia, usually among paraphyses. Spermatangial sori usually lacking paraphyses. Carpogonial branches 2–4-celled. Auxiliary cells intercalary in modified filaments borne laterally on paraphyses. Carposporangia in simple or branched linear series among paraphyses. Tetrasporangia regularly to irregularly cruciate.

Information contributed by: K.R. Dixon (2018). The most recent alteration to this page was made on 12 Aug 2021 by M.D. Guiry.

Comments: Vadas and Steneck (1988) call attention and give references to the tendency for Peyssonnelia species to be among the deepest-growing marine algae.

Numbers of names and species: There are 120 species names in the database at present, as well as 9 infraspecific names. Of the species names, 84 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: 01 January 2001 by M.D. Guiry

Verified by: 12 August 2021 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=25

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 28 September 2021.

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