155,837 species and infraspecific names are in the database, 21,968 images, 60,232 bibliographic items, 439,367 distributional records.

Pylaiella Bory, 1823, nom. cons.

Classification:
Empire Eukaryota
Kingdom Chromista
Phylum Ochrophyta
Class Phaeophyceae
Subclass Fucophycidae
Order Ectocarpales
Family Acinetosporaceae

Holotype species: Pylaiella littoralis (Linnaeus) Kjellman

Original publication:B[ory de Saint-Vincent, J.B.G.M.] (1823). Confervées. In: Dictionnaire Classique d'Histoire Naturelle. (Audouin, I. et al. Eds) Vol. 4, pp. 391-393. Paris: Rey et Gravier; Baudouin Frères.
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Type designated in Kjellman, F.R. (1872). Bidrag till kännedomen om Skandinaviens Ectocarpeer och Tilopterider. pp. 1-112, 2 plates. Stockholm: Akademisk afhandling Upsala.

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Silberfeld, T., Rousseau, F. & Reviers, B. de (2014). An updated classification of brown algae (Ochrophyta, Phaeophyceae). Cryptogamie Algologie 35(2): 117-156.

Nomenclatural notes
Named for Auguste-Jean-Marie Bachelot de la Pylaie (1786-1856), a well-known explorer and naturalist at the time Bory de Saint-Vincent chose to honour him; in later life he was best known for his archaeological contributions. Although the family name was spelled Bachelot de la Pilaie, after about 1820, he signed himself B. de la Pylaie or simply De la Pylaie (Silva et al. 1999). There has been a lot of dispute about the precise spelling of the epithet derived from his name, which culminated in the spelling "Pylaiella" being conserved (Silva, Lamy & Loiseaux-de Goër 1999). The spelling "Pilayella" has been used in many publications. - (1 Mar 2010) - M.D. Guiry

Description: The macrothallus is initially a uniseriate filament without a terminal true hair. Later it becomes parenchymatous by the formation of few longitudinal divisions. Branching is monopodial and true hairs are also absent on later developmental stages. Plurilocular and unilocular sporangia are formed by simple transformation of vegetative cells and the placing of the sporangia is only slightly localized. Growth is diffuse intercalary or slightly localized. Each cell contains several disc -shaped chloroplasts each with a pyrenoid.

The branching pattern of the species within the genus varies. Branches may be opposite or scattered in P. littoralis and P. gardneri or initially secund later in a bundle from 2-4 successive cells in P. varia. The more or less frequent formation of longitudinal walls justifies its position amongst parenchymatous brown algae. Longitudinal walls are especially frequent in loose-lying forms; these may occur in masses and create an environmental problem in some places (Wilce 1982). The species referable to Pylaiella show great phenotypic plasticity resulting in controversy about the number of species.

The most recent alteration to this page was made on 20 Jun 2014 by M.D. Guiry.

Numbers of names and species: There are 34 species names in the database at present, as well as 56 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.

References
Silva, P.C., Lamy, D., Loiseaux-de Goër, S. & Reviers, B. de (1999). Proposal to conserve the name Pylaiella Bory (Phaeophyceae) with a conserved spelling. Taxon 48: 139-140.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

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.

Created: 28 December 2000 by M.D. Guiry

Verified by: 20 June 2014 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=41

Citing AlgaeBase
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 July 2019.

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