Prionitis J., 1851, nom. cons.
Holotype species: Prionitis ligulata J.Agardh
Original publication and holotype designation: Agardh, J.G. (1851). Species genera et ordines algarum, seu descriptiones succinctae specierum, generum et ordinum, quibus algarum regnum constituitur. Volumen secundum: algas florideas complectens. Part 1. pp. [i]-xii, -336 + 337-351 [Addenda and Indices]. Lundae [Lund]: C.W.K. Gleerup.
Taxonomic status: currently recognized as a distinct genus.
Gender: This genus name is currently treated as feminine.
Most recent taxonomic treatment adopted: Gargiulo, G.M., Morabito, M. & Manghisi, A. (2013). A re-assessment of reproductive anatomy and postfertilization development in the systematics of Grateloupia Halymeniales, Rhodophyta). Cryptogamie Algologie 34(1): 3-25.
Schneider & Wynne (2013: 116) note that Gargiulo (2013, in press) resurrected this genus from synonymy with Grateloupia using reproductive and molecular data. - (22 Jul 2013) - Wendy Guiry
Description: Stipe cylindrical, remaining filiform or gradually expanding into a flat, linear, lanceolate or flabellate thallus, dichotomously, subdichotomously, pinnately, or proliferously branched, mostly from margins, to two to four or more orders. Different orders of branches usually of similar widths, sometimes constricted or stipitate at base. Rigid or cartilaginous. Holdfast discoid. Medulla densely filamentous. Cortex tightly packed, of spherical to elliptical cells, progressively smaller toward cuticle or an abrupt size difference between relatively thick inner and outer layers. Secondary pit connections present. Growth rings in stipes of some species suggest they are perennial. Reproductive structures occurring in ultimate segments, in lateral proliferous branches or in specially developed small proliferations. Dioecious. Ampullae with up to two orders of branches. Carpogonial branch 2-celled, on primary ampullar filament. Hypogynous cell can have short, sterile lateral, apparently fusing with carpogonium after fertilization. Auxiliary cell in separate ampulla, intercalary, usually in the primary filament. Connecting filament may contact more than one auxiliary cell. Auxiliary cell cutting off a single gonimoblast initial outwardly. Cystocarp compact, of many small carposporangia, embedded in thallus. Pericarp of ampullar cells, derivatives of ampullar cells, and vegetative cells. Small fusion cell formed. Carpostome present. Spermatangia superficial, cut off by primarily oblique walls. Tetrasporophyte isomorphic. Tetrasporangia cruciate, attached subbasally to intermediate cortical layer.
Information contributed by: S.C. Lindstrom & J.A. Lewis. The most recent alteration to this page was made on 29 Apr 2021 by M.D. Guiry.
Comments: Primarily a genus of the temperate North Pacific. Also reported from Peru, the Philippines, Vietnam and northern Australia.
Numbers of names and species: There are 45 species names in the database at present, as well as 11 infraspecific names. Of the species names, 17 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.
Schneider, C.W. & Wynne, M.J. (2013). Second addendum to the synoptic review of red algal genera. Botanica Marina 56(2): 111-118.
Gargiulo, G.M., Morabito, M. & Manghisi, A. (2013). A re-assessment of reproductive anatomy and postfertilization development in the systematics of Grateloupia Halymeniales, Rhodophyta). Cryptogamie Algologie 34(1): 3-25.
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
Verified by: 29 April 2021 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=34417
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 24 June 2021.