Pachymenia J.Agardh, 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. Epicrisis systematis Floridearum. pp. [ii*-iii*], [i]-[viï], [1]-724. Lipsiae [Leipzig]: apud T.O. Weigel.
Request PDFType designated in: Schmitz, F. (1889). Systematische Übersicht der bisher bekannten Gattungen der Florideen. Flora oder Allgemeine botanische Zeitung 72: 435-456, pl. XXI.
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 2010-10-08 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
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.
Comments: Australia, New Zealand, South Africa, Peru, Antarctica and subantarctic islands.
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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera,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=34411
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 08 October 2010. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 22 November 2024
