Predaea G.De[De fil.], 1936
Holotype species: Predaea masonii (Setchell & N.L.Gardner) De Toni fil.
Original publication and holotype designation: De Toni, G. (1936). Noterelle di nomenclatura algologica. VII. Primo elenco di Floridee omonime. pp. 8. Brescia: Privately published. [in Italian]
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: Thallus (gametophyte) erect, soft and gelatinous, forming planar blades with entire or broadly lobed margins, or compressed lobes, either rounded or pointed. Medullary filaments slender, loosely arranged, variously mixed with slender rhizoids; cortical filaments pigmented, densely dichotomously to subdichotomously divided, the cells generally ellipsoidal, occasionally rectilinear; intercalary vesicular (gland) cells in the cortex of some species. Monoecious or dioecious. Spermatangia in sparingly branched terminal clusters on superficial cortical cells. Carpogonial branches 2- or 3-celled, borne on inner cortical supporting cells usually proximal to auxiliary cells; auxiliary cells with clusters of nutritive cells attached to immediately adjacent cortical cells; nutritive cells often increasing in number as auxiliary cell enlarges and losing contents as carposporophyte matures; postfertilisation events involving transfer of zygote nuclei through several branched connecting filaments arising directly from carpogonium; gonimoblast initial arising laterally from connecting filament at point of fusion to auxiliary cell, or apically from auxiliary cell. Cystocarps with 1–3 gonimolobes and no sterile tissue. Tetrasporophyte phase microscopic, filamentous (known only from culture studies).
Information contributed by: Huisman (2018).. The most recent alteration to this page was made on 26 Sep 2018 by M.D. Guiry.
Numbers of names and species: There are 21 species names in the database at present, as well as 3 infraspecific names. Of the species names, 21 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):
Click here to also show infraspecific names in the list below.
Kraft, G.T. & John, D.M. (1976). The morphology and ecology of Nemastoma and Predaea species (Nemastomataceae, Rhodophyta) from Ghana. British Phycological Journal 11: 331-344.
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: 01 January 2001 by M.D. Guiry
Verified by: 24 January 2017 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=34039
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 17 February 2020.