Prionitis J.Agardh, 1851, nom. cons.

Holotype species: Prionitis ligulata J.Agardh

Currently accepted name for the type species: Prionitis lanceolata (Harvey) Harvey

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, [1]-336 + 337-351 [Addenda and Indices]. Lundae [Lund]: C.W.K. Gleerup.

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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 2021-07-19 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Gender: This genus name is currently treated as feminine.

Comments: Primarily a genus of the temperate North Pacific. Also reported from Peru, the Philippines, Vietnam and northern Australia.

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Contributors
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.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=34417

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 19 July 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 06 October 2022

 
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