156,011 species and infraspecific names are in the database, 21,990 images, 60,295 bibliographic items, 442,406 distributional records.

Petrospongium Nägeli ex Kützing, 1858

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

Holotype species: Petrospongium berkeleyi (Greville) Nägeli ex Kützing

Original publication and holotype designation: Kützing, F.T. (1858). Tabulae phycologicae; oder, Abbildungen der Tange. Vol. VIII pp. i-ii, 1-48, 100 plates. Nordhausen: Gedruckt auf kosten des Verfassers (in commission bei W. Köhne).
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Womersley, H.B.S. (1987). The marine benthic flora of southern Australia. Part II. pp. 481, 169 figs, 1 table, 8 plates, 4 maps. Adelaide: South Australian Government Printing Division.

Description: Plants epilithic or epiphytic, solid, hemispherical to expanded, spongy, rugose cushions, more or less circular in shape, haplostichous, composed of prostrate basal cell layer giving off rhizoidal filaments downward, di-trichotomously branched medullary filaments consisting of large cylindrical barrel-shaped colorless cells, and almost isodiametric, simple or sparsely branched assimilatory filaments consisting of small pigmented cells. Medullary filaments not closely attached with each other. Colorless slender filaments issue from medullary filaments and extend horizontally. Unilocular sporangia formed on basal part or lower part of assimilatory filaments, sessile or on 1-3 celled stalk cells, ellipsoid, kidney-shaped or irregular in shape, attached laterally when mature. Plurilocular sporangia uncommon, reported to occur terminally on assimilatory filaments.

Information contributed by: H. Kawai. The most recent alteration to this page was made on 23 Sep 2010 by M.D. Guiry.

Comments: Caram (1957) cultured unispores of P. berkeleyi and reported development of microthalli, however, whole life history not clear yet. Distributed in temperate area of North Atlantic Ocean and Pacific Ocean including Australia. Spring to summer annual.

Numbers of names and species: There are 3 species names in the database at present, of which 3 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
Racault, M.-F.L.P., Fletcher, R.L., De Reviers, B., Cho, G.Y., Boo, S.M., Parente, M.I. & Rousseau, F. (2009). Molecular phylogeny of the brown algal genus Petrospongium Nägeli ex Kütz. (Phaeophyceae) with evidence for Petrospongiaceae fam. nov. Cryptogamie, Algologie 30(2): 111-123.

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

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Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=32911

Citing AlgaeBase
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 19 August 2019.

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