Penium mooreanum W.Archer 1864
Publication Details
Penium mooreanum W.Archer 1864: 179, pl. 6: figs. 34-44 (as 'Mooreanum')
Published in: Archer, W. (1864). Description of two new species of Cosmarium (Corda) of Penium (Bréb.) and of Arthrodesmus (Ehr.). Quarterly journal of microscopical ccience, new series 4: 174-182, plate 6.
Request PDFPublication date: 1864
Type Species
The type species (lectotype) of the genus Penium is Penium margaritaceum Brébisson ex Ralfs.
Status of Name
This name is currently regarded as a synonym of Actinotaenium mooreanum (W.Archer) Teiling.
Type Information
Type locality: Featherbed Bog, and near Lough Bray [Co. Dublin, Ireland]; (Archer 1864: 179)
General Environment
This is a freshwater species.
Description
Frond very minute, about one
third longer than broad, sub-elliptic, sides somewhat barrelshaped,
ends truncato-rotund; endochrome dense, a single
large (amylaceous) granule in each half, and showing two or
three indistinct longitudinal " fillets," and an instinct, pale
central band; no moving granules at the extremities; end
view, orbicular or very broadly elliptic; empty cell-wall
colourless, without markings. Zygospore in front-view quadrangular,
oblong, about 10 : 6 longer than broad, compressed,
margins somewhat concave at the centre, angles produced,
mamillate, nipple-like at the extremities; contents sparing,
scattered; in side view elongate, often with a slight con-
Cavity at each side, ends rounded, extremities nipple-like ;
in end view, ovate, accuminate, extremities nipple-like. The
empty parent-cell-membranes persistent at each end of the
zygospore. If, as is mostly the case, the parent-cells conjugate
in a parallel position, the zygospore possesses a regular
cushion-like figure, all its angles lying in the same plane. But if, during the conjugation, the parent-cells lie at right angles to each other, there is then a corresponding
twist in the form of the zygospore, and in this case the
angles at one of its ends lie in a plane at right angles to
those of the other. Apparently froni a similar cause, any
intermediate degree of relationship in this regard may thus
take place. Misshapen or irregularly contorted zygospores
occasionally, but exceptionally occur, in which one of' the
corners may be inordinately drawn out, or the usual relative
proportions of length, breadth, and depth become partially or
locally interfered with. The mamillate form of the angles,
and their nipple-like extremities, are maintained, however,
in all cases. The conjugating, as well as
dividing, cells are surrounded by a distinctly bounded gelatinous
investment, which afterwards disappears.
Created: 15 April 2002 by M.D. Guiry.
Last updated: 16 May 2021
Verification of Data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.
Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=36493
Citing AlgaeBase
Cite this record as:
E.A. Molinari Novoa in Guiry, M.D. & Guiry, G.M. 16 May 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 02 May 2024
