Portieria Zanardini, 1851

Holotype species: Portieria coccinea Zanardini

Currently accepted name for the type species: Portieria hornemannii (Lyngbye) P.C.Silva

Original publication and holotype designation: Zanardini, G. (1851). Algae novae vel minus cognitae in mari Rubro a Portiero collectae. Flora 34: 33-38.

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Description: Thallus recumbent to erect, growing from a discoid holdfast, often with several fronds growing from a common holdfast, or tangled among other algae with no obvious holdfast, with 1 or more percurrent axes that are richly alternately branched. Axes compressed to flattened, with inrolled apices. Structure uniaxial; each axial cell producing 3 or 4 periaxial cells, the first arising alternately and forming the primary filament of lateral branches. Medulla pseudoparenchymatous, consisting of large cells, grading to a smaller-celled cortex with prominent vesicular cells. Spermatangia borne in nemathecia on outer cortical cells. Carpogonial branches 3- or 4-celled; basal cell conspicuously enlarged; auxiliary cell branches 3 (–4) celled. Following fertilisation, carpogonial branch cells distal to the basal cell fusing, issuing 1 or 2 connecting filaments that fuse laterally with auxiliary cells. Gonimoblast initials arising from diploidised auxiliary cells and developing thallus-outward among nemathecial filaments, forming compartments of densely clustered carposporangia surrounded by a pericarp in swollen nemathecial areas. Tetrasporangia in nemathecia along margins and the faces of axes and laterals, irregularly zonately-cruciately divided [after Payo et al. (2011); Guiry & Guiry (2017)].

Information contributed by: K.R. Dixon & Huisman (2018). The most recent alteration to this page was made on 2018-09-26 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Most recent taxonomic treatment adopted: Payo, D.A., Leliaert, F., Verbruggen, H., D'hondt, S., Calumpong, H.P. & De Clerck, O. (2013). Extensive cryptic species diversity and fine-scale endemism in the marine red alga Portieria in the Philippines. Proceedings: Biological Sciences 280: 20122660.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=34461

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 26 September 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 23 November 2024