Pachymenia J., 1876
Lectotype species: Pachymenia carnosa (J.Agardh) J.Agardh
Original publication:Agardh, J.G. (1876). Species genera et ordines algarum, seu descriptiones succinctae specierum, generum et ordinum, quibus algarum regnum constituitur. Volumen tertium: de Florideis curae posteriores. Part 1. pp. [ii*-iii*], [i]-[viï], -724. Lipsiae [Leipzig]: C.W.K. Gleerup.
Type designated in Schmitz, F. (1889). Systematische Übersicht der bisher bekannten Gattungen der Florideen. Flora oder Allgemeine botanische Zeitung 72: 435-456, pl. XXI.
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: Foliose, coriaceous, cuneate to ovate to orbiculate, cleft or uncleft, with or without short stipe, holdfast discoid. Margin proliferous in some species. Medulla of periclinal filaments and abundant rhizoids. Innermost cortical cells with stellate protuberances. Cortex thick, cells spherical or elliptical to fusiform, of only slightly smaller dimensions toward cuticle. Refractive cells sometimes present. Secondary pit connections present. Ampullae branched usually to three, occasionally four, rarely five orders. Carpogonium terminating a 2-celled branch on primary ampullar filament. Auxiliary cell a proximal cell of the primary filament or the basal cell of a secondary filament in a separate ampulla. A single, outwardly directed gonimoblast initial cut off auxilary cell, producing numerous gonimoblast filaments, most maturing into small carposporangia. Auxiliary fusion cell present in some species. Pericarp of ampullar filaments, their derivatives and neighboring medullary filaments. Cystocarp embedded. Tetrasporophyte isomorphic. Tetrasporangia of moderate size, cruciate, attached subbasally in intermediate cortical layer.
Information contributed by: S.C. Lindstrom & J.A. Lewis. The most recent alteration to this page was made on 8 Oct 2010 by M.D. Guiry.
Comments: Australia, New Zealand, South Africa, Peru, Antarctica and subantarctic islands.
Numbers of names and species: There are 17 species names in the database at present, of which 12 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.
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=34411
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 20 May 2019.