Porphyrostromium[de Saint-Léon], 1848, nom. rejic.
Holotype species: Porphyrostromium boryi Trevisan
Currently accepted name for the type species: Porphyrostromium boryanum (Montagne) P.C.Silva
Original publication and holotype designation: Trevisan, V.B.A. (1848). Saggio di una monografia delle Alghe Coccotalle. pp. 1-112. Padova [Padua]: coi tipi del seminario.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Athanasiadis, A. (2016). Phycologia Europaea Rhodophyta Vol. I. pp. [i]-xxxxviii, 1-762. Thessaloniki: Published and distributed by the author.
Description: Erect, filamentous/"trichoid" phase multiseriate, flat, a few mm in length, arising from a monostromatic, prostrate/"peltoid" phase. Margins of the encrusting "peltoid" phase are continuous. Pit plugs absent Growth diffuse, but may be apical in the early stages of development. Life history heteromorphic, consisting of an alternation between the "trichoid" phase and "peltoid" phase. Asexual reproduction by monospores which can be produced by both the erect and prostrate phases. Monosporangium formation is initiated by an unequal cytokinesis of a vegetative cell. Sexual reproduction present. Erect thalli are monoecious gametophytes. Spermatangia form by an unequal cytokinesis of a vegetative cell. The smaller of the two resulting cells forms a spermatangium that releases a single spermatium. Carpogonia have short trichogynes. Following fertilization each carpogonium forms a zygotosporanium that releases a single zygotospore which germinates and grows into the prostrate/"peltoid" phase, that in turn gives rise to the erect filamentous/"trichoid" phase. Meiosis presumably somatic.
Information contributed by: M.W. Hawkes. The most recent alteration to this page was made on 11 Feb 2017 by M.D. Guiry.
Comments: Geographical distribution northern Europe and southern British Columbia to Peru.
Given the simple morphology and putative antiquity of this group these records should be regarded as tentative pending further investigation to confirm they are all congeneric
Numbers of names and species: There are 8 species names in the database at present, of which 5 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.
Guiry, M.D. (1997). Benthic red, brown and green algae. In: The Species Directory of the Marine Fauna and Flora of the British Isles and Surrounding Seas. (Howson, C.M. & Picton, B.E. Eds), pp. 341-367. Belfast & Ross-on-Wye: Ulster Museum & Marine Conservation Society.
Wynne, M.J. (1986). Porphyrostromium Trevisan (1848) vs Erythrotrichopeltis Kornmann (1984) (Rhodophyta). Taxon 35: 328-329.
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: 28 December 2000 by M.D. Guiry
Verified by: 11 February 2017 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=32935
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 22 September 2019.