Holotype species: Ranavalona duckerae Kraft
Original publication and holotype designation: Kraft, G.T. (1977). Studies of marine algae in the lesser-known families of the Gigartinales (Rhodophyta). I. The Acrotylaceae. Australian Journal of Botany 25: 97-140, 18 figs.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Schneider, C.W. & Wynne, M.J. (2007). A synoptic review of the classification of red algal genera a half a century after Kylin's "Die Gattungen der Rhodophyceen". Botanica Marina 50: 197-249.
Description: Plants reach 6 cm in length, are epiphytic, erect from a discoid holdfast, and consist of flattened, linear axes above below that extend a short way distally as midribs. Planes of the marginal laterals are oriented at right angles to those of the bearing axes. The medulla occupies up to 1/3 the diameter of the axes and is fairly densely filamentous, being abruptly bordered by a 4-5 layered inner cortex of large, subisodiametric cells in turn bordered by a 2-3-layered anticlinal outer cortex. Support occur in subapical nemathecia and are polycarpogonial, bearing sterile cells as well as 3-celled carpogonial branches. Gonimoblasts enter the surrounding nutritive tissue, eventually initiating centripetal gonimoblast filaments bearing single terminal carposporangia. Cystocarps are deeply embedded primarily in the marginal laterals, and communicate by a long ostiole that is initiated by the stretching apart and breakdown of localized cortical filaments, but which later comes to be lined with adventitious cells to form a distinct pore. Tetrasporangia develop in nemathecia and are laterally attached to bearing cells (Kraft, 1977).
Information contributed by: G.T. Kraft. The most recent alteration to this page was made on 7 Oct 2010 by M.D. Guiry.
Comments: Distribution: Growing on Gelidium amansii in the mid- to lower-eulittoral; endemic to southern Madagascar (Plage Monseigneur, Fort Dauphin).
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):
Click here to also show infraspecific names in the list below.
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
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=39895
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 21 February 2019.