Halidrys Lyngbye, 1819, nom. cons.
Lectotype species: Halidrys siliquosa (Linnaeus) Lyngbye
Original publication: Lyngbye, H.C. (1819). Tentamen hydrophytologiae danicae continens omnia hydrophyta cryptogama Daniae, Holsatiae, Faeroae, Islandiae, Groenlandiae hucusque cognita, systematice disposita, descripta et iconibus illustrata, adjectis simul speciebus norvegicis. pp. [i]-xxxii, [1]-248, 70 pls. Hafniae [Copenhagen]: typis Schultzianis, in commissis Librariae Gyldendaliae.
Request PDFType designated in: De Toni, G.B. (1891). Systematische Übersicht der bisher bekannten Gattungen der echten Fucoideen. Flora 74: 171-182.
Description: Thalli erect, macroscopic, monopodially branched and bushy in habit, to 120 cm in length, seldom exceeding 10 mm in width, light olive-brown when young becoming dark brown to black later, arising from a large prominent, discoid/conical holdfast; thalli tough, leathery and smooth in texture and much branched throughout; axes and branches cylindrical below, becoming clearly dorsiventrally compressed above and alternately branched from the margins in one plane to several orders, branches variable in length, basal branches attaining length of parental axis, terminal branches more restricted and variable in length, sometimes remaining short and teeth-like, 2–3 mm in length; terminal branchlets developing into long narrow, linear, lanceolate, leaf-like branches with central vein-like midrib, air vesicles or receptacles; air vesicles characteristically siliquose, regularly septate, chambered, pod-like, to 4(–7) cm (to 12 chambers) in length, 3–5(–8) mm in width, borne on a pedicel, and usually mucronate or with terminal undifferentiated acuminate portion; in cross section, thalli with a central medullary region of small, tightly packed, polygonal, dark-pigmented cells surrounded by a cortical region of 10–15 larger, irregularly shaped, thick-walled, colourless, radially elongated cells, which become progressively smaller and pigmented towards the outside, and are enclosed within an outer meristoderm layer of palisade-like cells. Monoecious, bearing receptacles terminally on the branches, sometimes above an air vesicle, stalked, siliquose, acuminate, linear, simple, rarely branched, solitary or in clusters around central axis, to 4 cm in length, 3–6 mm in width; in section, showing sunken, spherical to flask-shaped hermaphrodite conceptacles bearing both oogonia and antheridia distributed throughout conceptacle cavity, associated with paraphyses; paraphyses multicellular, branched, colourless or sometimes terminally pigmented, comprising cylindrical, sometimes irregularly swollen cells, 20–80(–140) × 6–11(–18) µm; oogonia large, few in number, arising directly from conceptacle wall, darkly pigmented, broadly based, club to elongate-cylindrical, 135–185 (–220) × 63–80 (–110) µm, with a single egg; antheridia small, abundant and densely packed, 20–33 × 11–18 µm, borne terminally and laterally on branched, multicellular paraphyses, often clustered.
Information contributed by: Fletcher (2024: 604). The most recent alteration to this page was made on 2024-11-01 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: Silberfeld, T., Rousseau, F. & Reviers, B. de (2014). An updated classification of brown algae (Ochrophyta, Phaeophyceae). Cryptogamie Algologie 35(2): 117-156, 1 fig., 1 table.
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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=82
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 01 November 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 23 November 2024
