Heteroptilon Hommersand, 2006
Holotype species: Heteroptilon pappeanum (Kützing) Hommersand
Original publication and holotype designation: Hommersand, M.H., Freshwater, D.W., Lopez-Bautista, J.M. & Fredericq, S. (2006). Proposal of the Euptiloteae Hommersand et Fredericq, trib. nov. and transfer of some southern hemisphere Ptiloteae to the Callithamnieae (Ceramiaceae, Rhodophyta). Journal of Phycology 42: 203-225.
Request PDFDescription: Plants alternately branched in one plane, with one lateral initiated from each successive axial cell, and with the laterals developing into stiff, curved, unbranched, ecorticate filaments that initially overtop the main axis. Lateral filaments remaining unbranched, or adding branches irregularly and alternately near the thallus apex or only toward the base. Basal cells of each lateral filament forming a single initial that branches and either grows around the axis forming a small-celled two to three layered cortex or produces rhizoidal filaments that clothe the axis directly; if forming an outer cortex, then producing internal rhizoidal filaments that later envelop the central axis. Vegetative cells uninucleate. Gametophytes presumably dioecious; however, male plants unknown. Procarps borne subterminally or in series on modified indeterminate branches in which the terminal filaments are arranged irregularly in a tuft instead of being alternate-distichous; each fertile periaxial cell producing a single vegetative lateral, a supporting cell of a four-celled carpogonial branch at right angles to the vegetative lateral, and lastly a second periaxial cell opposite the first; sterile groups absent. Early post-fertilization stages, where known, as in the Callithamnieae; gonimoblasts typically paired, composed of two rounded gonimolobes and surrounded by a series of branched involucral filaments arising alternately from the segments below and sometimes those above the fertile segment. Tetrasporangia in short, second series, one per cell, on the adaxial sides of unbranched filaments, or on highly branched dwarf filaments and then mostly sessile or sometimes pedicellate; mature tetrasporangia ellipsoid and terahedrally divided.
The most recent alteration to this page was made on 2014-03-21 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.
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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=50642
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 21 March 2014. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 22 November 2024
