Trigenea Sonder, 1845

Holotype species: Trigenea australis Sonder

Description: Upright polysiphonous thalli, up to 40 cm tall, with cylindrical branched axes, up to ~5 mm thick. Axes clothed in most regions (T. australis), or in more restricted areas (T. umbellata), with simple or branched setaceous branchlets, occurring on all sides. All apices radially oriented; main axes tips regularly forming setaceous branchlets of determinate growth; apices of determinate branchlets producing colored trichoblasts, more or less persistent, on most segments in a 1/4 spiral. 4 pericentral cells becoming thickly corticated in main axes and at least 3-4 layers of cortication in determinate branchlets. Reproductive structures on determinate branchlets. Cystocarps spheroid, ostiolate, sessile in mid to distal part of branchlet. Male reproductive structures unknown. Tetrasporangia in a spiral series, 1 per segment, in distal parts of branchlet; branched persistent trichoblasts on fertile segments.

Information contributed by: R.E. Norris. The most recent alteration to this page was made on 2009-10-07 by Stephen Cusack.

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

Most recent taxonomic treatment adopted: Kylin, H. (1956). Die Gattungen der Rhodophyceen. pp. i-xv, 1-673, 458 figs. Lund: C.W.K. Gleerups.

Comments: Southern and Western Australia, subtidal. Records from N.Z. Antarctic Islands are in doubt (Papenfuss 1964, Hay et al. 1985).

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=42701

Citing AlgaeBase
Cite this record as:
Stephen Cusack in Guiry, M.D. & Guiry, G.M. 07 October 2009. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 19 April 2024