Pylaiella Bory de Saint-Vincent, 1823, nom. cons.

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.

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 2014-06-20 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: Silberfeld, T., Rousseau, F. & Reviers, B. de (2014). An updated classification of brown algae (Ochrophyta, Phaeophyceae). Cryptogamie Algologie 35(2): 117-156, 1 fig., 1 table.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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.

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 20 June 2014. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 26 February 2024

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