Halarachnion ligulatum (Woodward) Kützing 1843

Halarachnion ligulatum (Woodward) Kützing

Halarachnion ligulatum (Woodward) Kützingmicroscope, Ría de Muros, Galicia, Spain, 2006; TS thallusIgnacio Bárbara (barbara@udc.es)

Publication Details
Halarachnion ligulatum (Woodward) Kützing 1843: 394

Published in: Kützing, F.T. (1843). Phycologia generalis oder Anatomie, Physiologie und Systemkunde der Tange. Mit 80 farbig gedruckten Tafeln, gezeichnet und gravirt vom Verfasser. pp. [part 1]: [i]-xxxii, [1]-142, [part 2:] 143-458, 1, err.], pls 1-80. Leipzig: F.A. Brockhaus.

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Publication date: 14-16 Sep 1843

Type Species
This is the type species (holotype) of the genus Halarachnion.

Status of Name
This name is of an entity that is currently accepted taxonomically.

Basionym
Ulva ligulata Woodward

Type Information
Type locality: Yarmouth and Cromer, Norfolk, U.K.; (Dixon & Irvine 1977: 184) Lectotype: BM-K; An undated, unlocalised specimen labelled ‘from Mr Woodward’ selected as provisional lectotype (Dixon & Irvine 1977: 184)

Origin of Species Name
Adjective (Latin), ligulate (Stearn 1973).

General Environment
This is a marine species.

Description
Gametophytes thin, filmy to subcartilaginous, deep brownish red, flattened fronds, 500 mm long, simple to much-divided with very narrow segments, arising from a small basal disc. Often marginally and superficially proliferous. Tetrasporophyte as known as the Cruoria rosea-phase and forms thin, rounded crusts on shells, stones and maerl fragments in the subtidal (to 30 m).

Habitat
Gametophytes are annual (most obvious in April-June) and occur on rock, stones, shells, and maerl in spring and early summer , shallow subtidal (0-8 m), widely distributed, frequent. Tetrasporophytes occur all year around.

Key Characteristics
The gametophytes are filmy and delicate, and lack veins or frilly margins. Situation (shallow subtidal) and time of year (April-June) are helpful in making an identification.

Similar Species
Another annual,Halymenia latifolia Kützing, is more delicate, is generally elongated tongue-like, occurs later in the year (July-November) and is rather rare on western and southern shores.

Created: 30 March 1996 by M.D. Guiry.

Last updated: 17 February 2020

Verification of Data
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Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=21

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 17 February 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 14 August 2022

 
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