Allorgeia Gauthier-Lièvre ex Guiry & Coesel, 2018

Holotype species: Allorgeia valiae Gauthier-Lièvre ex Guiry & Coesel

Original publication and holotype designation: Guiry, M.D. & Coesel, P.F.M. (2018). Validation of the desmid generic name Allorgeia Gauthier-Lièvre, 1958 (Desmidiaceae, Conjugatophyceae). Notulae Algarum 75: 1-3, no figs.

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Description: Cell of medium size, strongly constricted at the isthmus, which can be part of an elongated rectangle in the longitudinal direction, this as well in frontal view as lateral; in apical view the rectangle is elongated transversely. The two half-cells, which are dissimilar, each comprise an apical lobe and four lateral lobes (or arms) inserted at the same level above the isthmus; they are bi- or trifurcated, and each division ends imperceptibly in a long tooth. In frontal view, in the half-cell A, which we will consider as the upper one, the apical sub-cylindrical lobe is marked by a crown of 5-6 long horns attenuated in a point and more or less upright. From the base of this lobe leave four lateral lobes (two on each side of the cell), more or less conical, bi- or trifurcated and attenuating in 2-4 long, stretched or recurved teeth. The lateral view is comparable to the frontal view, but a little narrower (compressed cell). In apical view, this half-cell is a bit flattened transversely; at the level of the lateral lobes each angle is prolonged in a bi- or trifurcated lobe, each division attenuating in 2-4 teeth; the apical lobe appears sub-circular-starry with 5-6 horns long attenuated in a point. The half-cell B, in frontal view, has shorter lateral lobes, attenuated in wide and short teeth; the apical lobe, sub-cylindrical at the base, ends with a concave apex, with on either side of this concavity, two short arms, bi- or trifurcated (sometimes quadrifurcated). The side view is identical but a little compressed; the apical view is rectangular, with angles prolonged in bi-or trifurcate lobes, short and robust; each division ends with one or two strong teeth; the apex is square with angles prolonged in short bi, tri- or quadrifurcated arms, each division attenuating in a point. The isthmus is narrow, the triangular sinus more or less constricted at its extremity, broadly flaring outwards; the incision separating the apical lobe from the lateral ones forms an almost straight angle. In frontal view, chloroplast with several pyrenoids (one at the base of each lobe); not seen in apical view. [translated to English as closely as possible from the original French of Gauthier-Lièvre, 1958: 97)]

Information contributed by: Gauthier-Lièvre ex Guiry & Coesel. The most recent alteration to this page was made on 2018-09-21 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.

Most recent taxonomic treatment adopted: Guiry, M.D. & Coesel, P.F.M. (2018). Validation of the desmid generic name Allorgeia Gauthier-Lièvre, 1958 (Desmidiaceae, Conjugatophyceae). Notulae Algarum 75: 1-3, no figs.

Comments: Etymology: named for Professor Pierre Allorge (1891-1944), algologist at the Muséum National d’Histoire Naturelle in Paris.

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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=47151

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 21 September 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 25 April 2024