Electronic Flora of South Australia Genus Fact Sheet

Genus FELDMANNIA Hamel 1939b: xi

Phylum Phaeophyta – Order Ectocarpales

Thallus filamentous, uniseriate, slightly to (usually) densely tufted with a much branched entangled basal region with rhizoids, and long, erect, largely unbranched filaments each with a basal meristematic zone and longer cells above; erect filaments of fairly uniform diameter, sometimes tapering slightly into a false hair. Growth diffuse but largely confined to meristematic zones at the base of the long erect filaments. Cells with numerous discoid phaeoplasts, each with a pyrenoid.

Reproduction: Reproduction by plurilocular neutral sporangia (or gametangia) and by unilocular meiosporangia borne below the meristematic zones of the erect filaments; reproductive organs usually pedicellate.

Type species: F. lebelii (Crouan & Crouan) Hamel.

Taxonomic notes: Feldmannia, a genus of 8–10 species, is distinguished by the growth habit, with branching largely confined to the base of the tufts, and long, unbranched filaments surmounting each meristematic region; the usually pedicellate reproductive organs are borne on the lower filaments below the meristematic regions. One species, F. irregularis, has a greater degree of branching with additional meristematic zones, and the plurilocular sporangia are sessile; in growth habit, however, it agrees with Feldmannia in that the upper filaments are long and unbranched, but some authors have placed it in Giffordia.

Kornmann (1953) and Knoepffler-Péguy (1974) consider that Feldmannia lebelii and Acinetospora are stages of one species, but this has not been investigated in Australian taxa and for the present it is more convenient to regard the species below as morphological entities.

References:

HAMEL, G. (1939b). Phéophycées de France. Fasc. V, pp. 337–432, i-xlvii. (Paris.)

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

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

KEY TO SPECIES OF FELDMANNIA

1. Erect filaments in mature plants usually with several meristematic zones, branching abundant below but with long unbranched filaments above; plurilocular sporangia usually sessile, strongly attenuate

I. F. irregularis

1. Erect filaments each with a single, basal or sub-basal meristematic zone, though diffuse growth also may occur; plurilocular sporangia mostly pedicellate

2

2. Tufts mucilaginous, branches (or branch and sporangium) often opposite, plurilocular sporangia ovoid to oblong, borne on a 1–3 celled pedicel often longer than the sporangium

F. paradoxa

2. Tufts not mucilaginous, branches rarely opposite; plurilocular sporangia globular to ovoid, elongate-ovoid or tapering, with a short, single-celled pedicel

3

3. Filaments (24–) 30–50 (–60) µm broad; plurilocular sporangia globular to ovoid with broad or truncate apices

F globifera

3. Filaments 14–20 (–24) µm broad; plurilocular sporangia usually distinctly tapering, broadest near their base or mid part

F. lebelii


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