Electronic Flora of South Australia Species Fact Sheet

Feldmannia lebelii (Crouan & Crouan) Hamel 1939: xvii.

Phylum Phaeophyta – Order Ectocarpales

Synonyms

Ectocarpus lebelii Crouan & Crouan. Feldmann 1937: 247, fig. 35D,E. Hamel 1931: 41, fig. 11.

Feldmannia caespitula var. lebelii (Crouan & Crouan) Knoepffler-Péguy 1970: 160, figs 8,9.

Thallus medium brown, forming small tufts 1–5 (–8) mm long, usually on larger brown algae, with densely clustered filaments at the base with filaments and rhizoids penetrating the host, and occasional branches below the meristematic zones at the base of each long unbranched terminal filament (Fig. 9E). Filaments (Fig. 9F) slender, of fairly uniform diameter throughout, (12–) 14–20 (–24) µm, with cells L/B (1.5–) 2–4 in both lower parts and upper terminal filaments. Growth mainly from the single meristems (Fig. 9F) but with occasional diffuse divisions. Cells (Fig. 9G,H) with numerous discoid phaeoplasts each with a pyrenoid and clustered physodes.

Reproduction: Plurilocular sporangia (Fig. 9G–I) usually with a single-celled pedicel, occasionally sessile, elongate and tapering, (40–) 60–120 (–160) µm long and (15–) 20–35 (–40) µm in diameter. Unilocular sporangia (Fig. 9J) borne near base of filaments, pedicellate, subspherical to slightly ovoid, 20–25 µm in diameter.

Type from Brest (Finistêre), France; in CO (or PC?).


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

Distribution: Europe and the Mediterranean.

In southern Australia, known from Port Noarlunga, S. Aust., on Sargassum in reef pools (Womersley, 2.i.1963; ADU, A27062). Seal Beach, Kangaroo I., S. Aust., on Codium galeatum, drift ( Womersley, 21.i.1965; ADU, A28899). Point Roadknight, Vic., on Corallina, low eulittoral pools ( Womersley, 22.i.1967; ADU, A31523). Lorne, Vic., on Suringariella, low eulittoral pools (Womersley, 23.i.1967; ADU, A31535). Binalong Bay, Tas., on Phyllospora, upper sublittoral (Wollaston & Mitchell, 3.iii.1964; ADU, A27944). Bicheno, Tas., on Cystophora subfarcinata, uppermost sublittoral (Skinner, 22.ii.1978; ADU, A49214). Tesselated Pavement, Eaglehawk Neck, Tas., on Hormosira, lower eulittoral (Gordon, 13.i.1966; ADU, A30083).

Taxonomic notes: The only previous southern Australian record of F. lebelii is that of King & Ducker (1971, p. 115) from Queenscliff, Vic.

The specimens grouped above as F. lebelii form small tufts, mostly on larger brown algae, of typical Feldmannia form and with slender filaments, rarely over 20 µm in diameter. They agree fairly well with descriptions and illustrations (e.g. Hamel 1931, p. 41, fig. 11) of this species. Comparisons are needed with slender forms (with tapering plurilocular sporangia) placed in the F. globifera-F. simplex complex by Clayton (1974), but which are here placed under F. lebelii.

F. lebelii is considered to be a phase of Acinetospora by Kornmann (1953) and Knoepffler-Péguy (1974, 1977), but this has not been established for Australian material.

References:

CLAYTON, M.N. (1974). Studies on the development, life history and taxonomy of the Ectocarpales (Phaeophyta) in southern Australia. Aust. J. Bot. 22, 743–813.

FELDMANN, J. (1937). Les Algues marines de la Côte des Albères. I–III. Cyanophycées, Chlorophycées, Phéophycées. Rev. Algol. 9, 141–335, Plates 8–17.

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

KING, R.J. & DUCKER, S. (1971). In King, R.J., Black, J.H. & Ducker, S. Intertidal ecology of Port Phillip Bay, with systematic lists of plants and animals. 3. Flora of the intertidal region, pp. 112–128. Mem. Nat. Mus. Vic. 32, 93–128.

KNOEPFFLER-PÉGUY, M. (1970). Quelques Feldmannia Hamel, 1939 (Phaeophyceae-Ectocarpales) des côtes d'Europe. Vie et Milieu Sér. A. 21, 137–188.

KNOEPFFLER-PÉGUY, M. (1974). Le genre Acinetospora Bornet 1891 (Phaeophyceae-Ectocarpales). Vie et Milieu, Sér. A, 24, 43–72.

KNOEPFFLER-PÉGUY, M. (1977). Polymorphisme et environment chez les Feldmannia (Ectocarpacêes). Rev. Algol., N.S., 12, 111–128.

KORNMANN, P. (1953). Der Formenkreis von Acinetospora crinita (Carm.) nov. comb. Helgol. wiss. Meeresunters. 4, 205–224.

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. 9 E–J.

Figure 9 image

Figure 9   enlarge

Fig. 9. A–D. Feldmannia globifera (ADU, A31944). A. Branching pattern. B. Branching system with plurilocular sporangia; upper filaments several times longer than shown. C. Mature cell with phaeoplasts and physodes. D. Pedicellate plurilocular sporangium. E–J. Feldmannia lebelii (E–G, ADU, A27062; H, ADU, A49214; I, ADU, A31523; J, ADU, A28899). E. Branching pattern. F. Filaments with meristematic regions and plurilocular sporangia. G. Tapering plurilocular sporangium. H. Elongate plurilocular sporangia. I. Plurilocular sporangia with more rounded ends J. Unilocular sporangia.


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