Rhamnochrysis R.T.& Markey, 1974
Holotype species: Rhamnochrysis aestuarinae R.T.Wilce & Markey
Original publication and holotype designation: Wilce, R.T. & Markey, D.R. (1974). Rhamnochrysis aestuarinae, a new monotypic genus of benthic marine chrysophytes. Journal of Phycology 10: 82-88.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Kristiansen, J. & Preisig, H.R. (2001). Encyclopedia of Chrysophyte genera. Bibliotheca Phycologica 110: 1-260.
Description: Thallus filamentous, densely branched, appearing as dark brown, wiry tufts, reaching 0.5-1 mm high, attached by a pigmented globose cell with initial and major axes prostrate, and branches erect or suberect. Major axis composed of globose cells similar in size and morphology to the basal cell (14-16 ( 16-19 &m) ; branches with cylindrical cells (5-8 ( 10-18 &m), constricted at septa. Reproductive axes uniseriate to pluriseriate, without morphologically distinct sporangia. Two, brown, band-shaped chloroplasts in each mature cell with a pyrenoid-like structure visible in thin-sections only. One to several refractive chrysolaminaran vacuoles. All axes limited by a gelatinous, sometimes lamellated sheath. A single zoospore is formed per cell, usually after repeated cell division of the reproductive initial. Zoospores small, spherical (3-4 &m in diam.), with 2 lateral heterokont flagella, a pleuronematic anterior flagellum (2.5 times the cell diam.) and a smooth and acronematic posterior one (1.5 times the cell diam.). Single chloroplast with a stigma. No stomatocysts nor sexual reproduction recorded in culture. Found in brackish, salt marshes, shaded wood pilings, exclusive of other possible substrates, and is known so far from a single locality in Massachusetts, USA.
Information contributed by: C. Billard. The most recent alteration to this page was made on 25 Jul 2017 by M.D. Guiry.
Numbers of names and species: There is only one species or infraspecific name in the database at present, which has 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
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: 23 May 2002 by Elizabeth Moran
Verified by: 21 July 2017 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=44813
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 05 August 2020.