Amphiplexia J., 1892
Holotype species: Amphiplexia hymenocladioides J.Agardh
Original publication:Agardh, J.G. (1892). Analecta algologica. Acta Universitatis Lundensis 28(6): 1-182, 3 pls.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Kraft, G.T. & Womersley, H.B.S. (1994). Family Acrotylaceae Schmitz 1892: 18. In: The marine benthic flora of southern Australia. Rhodophyta - Part IIIA. (Womersley, H.B.S. Eds), pp. 363-376. Canberra:
Description: Plants reach 16 cm in length and grow singly or in clusters from a crustose base. They are irregularly branched and tubular throughout, or composed of tubular branches on a cartilaginous main axis. Tubular branches are mostly filled with mucilage in which isolated medullary strands are scattered. The cortex consists of an inner layer of large subisodiametric cells at an abrupt transition from the medulla, and 1-2 outer cortical layers that form surface rosettes around the inner cortical cells. Supporting cells are monocarpogonial, bear a 3-celled carpogonial branch lacking sterile laterals, and appear to be diploidized by a direct tubular outgrowth from the fertilized carpogonium. Gonimoblasts develop outwardly across a basal nutritive tissue on the floor of a prominently protuberant, ostiolate pericarp. Carposporangia form in chains of 2-3 from filaments lining the pericarp wall or erupting from the floor of the cystocarp cavity. Tetrasporangia are formed in an intercalary position within the cortex over wide areas of the plant (Kraft, 1977).
Information contributed by: G. Kraft. The most recent alteration to this page was made on 21 Jul 2009 by Wendy Guiry.
Comments: Distribution: Plants occur in open light on rock, seagrass stems and jetty pilings from 3-30 m depths; the type species is recorded from the Perth region (Western Australia) along the southern coast to Port Phillip Heads (Victoria). The second species, A. racemosa (J. Agardh) Kraft, is of much more restricted distribution and occurrence from the Perth region to Elliston (South Australia) .
Numbers of names and species: There are 3 species names in the database at present, of which 2 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):
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Verification of data
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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: 01 January 2001 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=34971
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 18 November 2018.