157,571 species and infraspecific names are in the database, 22,210 images, 60,987 bibliographic items, 459,373 distributional records.

Phloiocaulon T.Geyler, 1866

Empire Eukaryota
Kingdom Chromista
Phylum Ochrophyta
Class Phaeophyceae
Subclass Dictyotophycidae
Order Sphacelariales
Family Stypocaulaceae

Holotype species: Phloiocaulon squamulosum (Suhr) Geyler

Original publication and holotype designation: Geyler, T. (1866). Zur Kenntniss der Sphacelarieen. Jahrbücher für Wissenschaftliche Botanik 4: 479-535, Plates 34-36.

Taxonomic status: currently recognized as a distinct genus.

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.

Description: Plants forming 5-30 cm tall, medium to dark brown, epilithic, erect, spreading thalli or loose tufts, with one to several heterotrichous axes. Basal parts consisting of small or extensive, polystromatic, crustose discs. Axes and indeterminate laterals long and prominent, erect, terete, auxocaulous, blackish, smooth and wiry. Branching of several orders, radial or subdistichous near the apices, appearing as numerous, lateral, alternate, dense, fasciculate tufts along the black, wiry, sparsely branched, indeterminate laterals. Forming one lenticular branch initial from each conspicuous cylindrical apical cell before a segment is cut off. Segments each dividing transversely once preceeding frequent longitudinal and transverse segmentation and secondary growth. Internal structure of axes with small, quadrangular, medullary cells, a pseudo-parenchymatous inner cortex of large and enlarging cells and in older axes a smaller-celled outer cortex. No loose descending rhizoids, but appressed rhizoidal secondary cortication developing at base of lateral tufts. Hairs in clusters in axils of young laterals. Pericysts absent. Reproductive structures: clustered, plurilocular gametangia and geminate or clustered unilocular zoidangia, in loose or dense spikes. Marine in tidal pools and in sublittoral. Temperate southern hemisphere. The diplontic life history is probably isomorphic, anisogamous and monoecious.

Information contributed by: Prud'homme van Reine. The most recent alteration to this page was made on 27 Apr 2015 by M.D. Guiry.

Numbers of names and species: There are 4 species names in the database at present, of which 4 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.

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.

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: 27 April 2015 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=40697

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 26 February 2020.

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