Phloiocaulon T.Geyler, 1866

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, 3 plates [34-36].

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 2015-04-27 by M.D. Guiry.

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

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, 1 fig., 1 table.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=40697

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 27 April 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 23 November 2024