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Electronic Flora of South Australia Species Fact Sheet

Streblonema fasciculatum Thuret in Le Jolis 1863: 73.

Phylum Phaeophyta – Order Ectocarpales

Selected citations: Hamel 1931: 69, fig. 20c. Kuckuck 1954: 109, fig. 4. Taylor 1957: 114.

Thallus (Fig. 14D) endophytic in Chordariales (e.g. Leathesia) with branched, more or less horizontal, filaments just within the host cortex, rhizoidal filaments penetrating deeply, and plurilocular sporangia and phaeophycean hairs emerging from the host. Filaments 6–10 µm in diameter with cells irregularly cylindrical and L/B 1–2 (–3); phaeophycean hairs (Fig. 14D) with a basal meristem of 2–4 cells and 8–10 µm in diameter above with cells L/B 5–10. Cells with a few elongate to discoid phaeoplasts.

Reproduction: Reproduction by sessile or shortly pedicellate multiseriate plurilocular sporangia (Fig. 14D), single or clustered, each tapering from their mid or lower regions, 40–60 (–80) µm long and 16–20 µm in diameter.

Type from Cherbourg, France, in Castagnea virescens; in Herb. Thuret, PC.

Distribution map based
on current data relating to
specimens held in the
State Herbarium of SA

Distribution: Northern Europe, from France to Norway; N.E. U.S.A.; Japan.

In southern Australia, known from Nora Creina, S. Aust., upper sublittoral, in Helminthocladia densa (Moore, 26.ii.1983; ADU, A56577), and Shelter Point, Boat Harbour beach, N. Tas., mid eulittoral in Leathesia difformis (Womersley, 16.x.1982; ADU, A55723).

Taxonomic notes: The above collection agrees well with descriptions and illustrations of S. fasciculatum from Europe, where it is known from a variety of Chordarialean hosts. The irregular prostrate filaments occur just below the surface of the Leathesia, with rhizoids penetrating deeper, and with the sporangia and hairs emergent from the host. The sporangia are all simple and agree with those of f. simplex (Kuckuck 1954, fig. 4B,C).


HAMEL, G. (1931). Phéophycées de France. Fasc. I, pp. 1–80. (Paris.)

KUCKUCK, P. (1954). Herausgegeben von P. Kornmann. Ectocarpaceen-Studien II. Streblonema. Helgol. wiss. Meeresunters. 5, 103–117.

LE JOLIS, A. (1863). Liste des algues marines de Cherbourg. Mem. Imp. Soc. Sci. Nat. Cherbourg 10, 1–168, Plates 1–6.

TAYLOR, W.R. (1957). Marine algae of the Northeastern coast of North America. Rev. Edn. (Univ. Mich. Press: Ann Arbor.)

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
©Board of the Botanic Gardens and State Herbarium, Government of South Australia

Illustration in Womersley Part II, 1997: FIG. 14D.

Figure 14 image

Figure 14   enlarge

Fig. 14. A–C. Giffordia ovata (after Clayton 1974, fig. 17). A,B. Filaments with meristematic regions and plurilocular sporangia. C. Cell with phaeoplasts and pyrenoids. D. Streblonema fasciculatum (ADU, A55723). Filament with plurilocular sporangia, a hair, and basal (rhizoidal) filaments penetrating the host. E,F. Gonanema ramosum (ADU, A55953). E. Thallus (diagrammatic) on Adenocystis, showing erect assimilatory filaments with zone of plurilocular sporangia, long hairs, and basal filaments penetrating the host. F. Assimilatory filaments, hairs and plurilocular sporangia.

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