152,876 species and infraspecific names are in the database, 20,938 images, 59,117 bibliographic items, 408,264 distributional records.

Petroglossum Hollenberg, 1943

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Rhodymeniophycidae
Order Gigartinales
Family Phyllophoraceae

Holotype species: Petroglossum pacificum Hollenberg

Original publication and holotype designation: Hollenberg, G.J. (1943). New marine algae from southern California II. American Journal of Botany 30: 571-579.
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Precise date of publication18 November 1943

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Schneider, C.W. & Wynne, M.J. (2007). A synoptic review of the classification of red algal genera a half a century after Kylin's "Die Gattungen der Rhodophyceen". Botanica Marina 50: 197-249.

Description: Plants are generally less than 5 cm in height and consist of flattened, linear, regularly to irregularly subdichotomous blades arising singly or in clusters from an encrusting or stoloniferous base. Spermatangia form in nemathecia located centrally or terminally on the axes. Cystocarps form singly toward the center of the fronds or in short lateral proliferations, depending on the species. Ostioles may or may not be present, again depending on species. Tetrasporangial nemathecia generally occur singly toward the centers of branch units. Petroglossum differs from Phyllophora in producing spermatangial mother-cell clusters flush with the branch surface, as opposed to in cavities (Schneider and Searles 1976).

Information contributed by: G.T. Kraft. The most recent alteration to this page was made on 30 Aug 2011 by M.D. Guiry.

Comments: Distribution: The type and a second species are endemic to southern California, where they occur on low intertidal to subtidal rocks. The third species was recently described from deep (28 m) subtidal habitats in North Carolina (Schneider and Searles 1976).

Numbers of names and species: There are 4 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.

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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.

Created: 28 December 2000 by M.D. Guiry

Verified by: 30 August 2011 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=37272

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 18 September 2018.

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