Electronic Flora of South Australia Genus Fact Sheet

Genus STILOPSIS Kuckuck 1929: 11,70

Phylum Phaeophyta – Order Chordariales – Family Spermatochnaceae

Thallus irregularly subdichotomous, haplostichous, slender, 5–20 cm long, 0.5–1 mm in diameter below, tapering gently above. Branch apices with a single filament with apical growth. Medulla of a single axial filament, usually remaining solid. Cortex 2–5 cells thick, pseudo-parenchymatous with large inner cells and smaller outer cells. Primary assimilatory filaments 1–2 (–3) cells long, formed close to apices, remaining as a continuous papillose layer over most of the thallus (older parts partly denuded), accompanied by scattered hairs, with scattered tufts of secondary assimilatory filaments (with hairs and sporangia) arising on older branches.

Reproduction: Reproduction by uniseriate plurilocular sporangia with 5–10 locules and ovoid unilocular sporangia, present in the same or separate tufts of secondary assimilatory filaments.

Life history unknown; probably diplohaplontic.

Type species: S. lejolisii (Thuret) Kuckuck.

Taxonomic notes: A genus of two species, the type and S. harveyana from southern Australia. Stilopsis is distinguished by its single axial filament and continuous papillose layer of 1–2 (–3) celled primary assimilatory filaments covering the whole thallus.

References:

KUCKUCK, P. (1929). Fragmente einer Monographie des Pheosporeen. Biol. Anst. Helgol. 17, 1–93.

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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