Aristoptilon Hommersand & W.A.Nelson, 2006

Holotype species: Aristoptilon mooreanum (Lindauer) Hommersand & W.A.Nelson

Original publication: 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.

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Description: Plants alternately branched in one plane, with one lateral initiated from each successive axial cell and forming a curved filament that overtops the main axis. Lateral filaments ecorticate, initially branching from the first, third and fifth segments, but adding branches later to the intervening unbranched segments; laterals on main axes all converting to alternate-distichous branching and each producing a corticated determinate branchlet or an indeterminate branch. Basal cells of lateral filaments each cutting off a single initial that grows and branches around the axial cells to form a two-layered cortex, with the inner layer composed of larger cells and the outer layer of smaller cells; rhizoidal filaments issuing from the outer cortical layer and growing inward and downward, enveloping the central axis. Vegetative cells uninucleate. Gametophytes dioecious. Spematangial filaments typically developing from two initials on the adaxial sides of cells of the ultimate or penultimate branches of lateral filaments and forming a single cluster of densely branched filaments several cell layers thick covered by a mantle of spermatangia; each spermatangium containing a median nucleus and terminal and proximal mucilaginous vesicles. Procarps formed subterminally on dwarf determinate filaments, one per fertile branch; each fertile axial cell producing a single vegetative lateral, a supporting cell of a four-celled carpogonial branch at a 45º angle to the axis of the vegetative lateral, and lastly a second periaxial cell opposite the first. Early postfertilization stages as in Callithamnieae; gonimoblast initials, each cutting off two terminal gonimolobe initials whose filaments unite to form a single terminal gonimolobe with lateral gonimolobes formed later. Gonimoblasts coverd basally by a basketwork of small-celled filaments produced on the fertile axial cell and surrounded by an involucre of unbranched filaments arising from the fertile axial cell and several of the axial cells below. Tetrasporangia one per cell, and terminal or lateral on dwarf branches borne on ecorticate lateral filaments in determinate branchlets; mature tetrasporangia obovoid, tetrahedrally divided.

The most recent alteration to this page was made on 2010-10-19 by Wendy Guiry.

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

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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=50648

Citing AlgaeBase
Cite this record as:
Wendy Guiry in Guiry, M.D. & Guiry, G.M. 19 October 2010. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 30 December 2024

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