Electronic Flora of South Australia Genus Fact Sheet

Genus SPATOGLOSSUM Kützing 1843: 339

Phylum Phaeophyta – Order Dictyotales – Family Dictyotaceae – Tribe Zonarieae

Thallus complanate, irregularly laterally branched or lacerate, usually 10–30 cm long with branches 1–4 cm broad, without a midrib or lateral veins, attached by a matted rhizoidal holdfast. Growth by a group of apical cells in a slightly depressed apex. Structure 4–5 cells thick, with cortical cells usually subdivided once from larger medullary cells, cells irregularly placed in transverse section. Hair tufts scattered, with densely arranged phaeophycean hairs arising from a pit within the thallus.

Reproduction: Sporangia scattered, transformed from cortical cells and remaining sunk in the thallus, tetrahedrally divided. Oogonia and antheridial sori developed from cortical cells, remaining sunk in the thallus.

Life history unknown, but probably diplohaplontic and isomorphic.

Lectotype species: S. solierii (Chauvin ex Montagne) Kützing.

Taxonomic notes: Spatoglossum includes some 17 species from cool temperate southern hemisphere and tropical waters (Allender & Kraft 1983, p. 100). It is distinguished by the small group of apical cells, lack of a midrib, irregular cell arrangement in transverse section, and sporangia sunk in the thallus. A single species is known from the Gulf region of South Australia.

References:

ALLENDER, B.M. & KRAFT, G.T. (1983). The marine algae of Lord Howe Island (New South Wales): The Dictyotales and Cutleriales (Phaeophyta). Brunonia 6, 73–130.

KÜTZING, F.T. (1843). Phycologia generalis. (Leipzig.)

The Marine Benthic Flora of Southern Australia Part II complete list of references.

Author: H.B.S. Womersley

Publication: Womersley, H.B.S. (14 December, 1987)
The Marine Benthic Flora of Southern Australia
Part II
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