Electronic Flora of South Australia Genus Fact Sheet

Genus LOBOSPIRA Areschoug 1854: 363

Phylum Phaeophyta – Order Dictyotales – Family Dictyotaceae – Tribe Zonarieae

Thallus erect, with numerous slender axes bearing short, spirally arranged, simple or bicuspid, compressed ramuli 0.5–3 mm long, with basal, recurved, attachment tendrils. Growth by a row of 8–12 apical cells, forming the axis and ramuli mostly 4 cells thick near apices, axes becoming many cells thick and subterete below. Phaeoplasts numerous in cortical cells, discoid. Phaeophycean hairs in small tufts.

Reproduction: Unilocular sporangia scattered, sunken in the cortex, producing four spores. Sexual plants unknown.

Life history unknown, possibly direct from the sporophyte.

Type species: L. bicuspidata Areschoug.

Taxonomic notes: This monospecific genus is distinctive in its spirally twisted thallus and short, simple or bicuspid, lateral ramuli. The apical growth and young stages derived from the spores have been described by Edelstein & Womersley (1975), but the life history is incompletely known.


ARESCHOUG, J.E. (1854). Phyceae novae et minus cognitae in maribus extraeuropaeis collectae. Ada Reg. Soc. Sci. Upsala, Ser. III, 1, 329–372.

EDELSTEIN, T. & WOMERSLEY, H.B.S. (1975). The thallus and spore development of Lobospira bicuspidata Areschoug (Dictyotales: Phaeophyta). Trans. R. Soc. S. Aust. 99, 149–156.

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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