Electronic Flora of South Australia Species Fact Sheet

Peyssonnelia dubyi Crouan & Crouan 1844: 368, pl. 11 figs 6–10.

Phylum Rhodophyta – Class Florideophyceae – Order Gigartinales – Family Peyssonneliaceae

Selected citations: Boudouresque & Denizot 1975: 51, figs 92–96. Denizot 1968: 112, fig. 96. Irvine & Maggs 1983: 57, figs 18C, 19B. Kylin 1928: 35, fig. 18.


Cruoriella dubyi (Crouan & Crouan) Schmitz. Dawson 1953: 111, p1. 7 figs 2,3. Rosenvinge 1917: 193, figs 115–117.

Thallus medium red, (0.5–) 1–3 cm across, orbicular to irregularly spreading, completely adherent, without superficial growth zones, 60–100 µm thick, epilithic or epiphytic on crustose coralline algae. Structure. Basal layer (Fig. 47G) of filaments arranged in flabellate systems, rows branching, spreading and mostly not parallel, cells from below (10–) 12–18 (–20) µm in diameter and L/D (1–) 1.5–2.5, 12–16 µm in height and L/D 1–2, producing occasional short unicellular rhizoids; hypobasal calcification slight. Erect filaments (Fig. 47F) 3–7 cells long, almost vertical (60–80°), the lowest cell similar in shape and dimensions to the basal layer cell and pit-connected centrally to it, then branched, upper cells 10–14 µm in diameter and L/D 0.5–1, reflecting the flabellules in surface arrangement; internal calcification absent.

Reproduction: Sexual sori superficial, mucilaginous; carpogonial and auxiliary cell branches lateral, 4–5 cells long, carposporangia in branched rows of 2–5, each 30–40 µm across; spermatangia (Irvine & Maggs 1983, p. 57) in terminal groups.

Tetrasporangial son (Fig. 47H) shallow, 0.5–1 mm across, tetrasporangia terminal or lateral, 40–60 µm long and 15–30 µm in diameter, cruciately divided.

Type from Brivatem (Brest, France - see Irvine & Maggs 1983, p. 57); in CO.

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

Distribution: Europe, Britain, Mediterranean, Baha California.

In southern Australia, from Pearson I., S. Aust., to Point Lonsdale, Vic. Probably far more widespread.

Taxonomic notes: These specimens agree reasonably well in the polyflabellate arrangement of the basal layer, in thallus structure and thickness, and in the tetrasporangial sori with P. dubyi. Several closely related species have been described (see Denizot 1968, pp. 112–114) and some at least are doubtfully distinct.


BOUDOURESQUE, C.-F. & DENIZOT, M. (1975). Révision du genre Peyssonnelia (Rhodophyta) en Méditerranée. Bull. Mus. Hist. Nat. Marseilles 35, 7–92.

CROUAN, P.L. & CROUAN, H.M. (1844). Observations sur le genre Peyssonelia Dne. Ann. Sci. Nat., 3 Sér. Bot., 2, 367–368, Plate 11B, figs 6–10.

DAWSON, E.Y. (1953). Marine red algae of Pacific Mexico. Part I. Bangiales to Corallinaceae subf. Corallinoideae. Allan Hancock Pacif. Exped. 17, 1–239.

DENIZOT, M. (1968). Les Algues Floridées encroûtantes (a l'exclusion des Corallinacées). (Paris.)

IRVINE, L.M. & MAGGS, C.A. (1983). Peyssonneliaceae. In Irvine, L.M., Seaweeds of the British Isles. Part 2A. Cryptonemiales (sensu stricto), Palmariales, Rhodymeniales. [British Museum (N.H.): London.]

KYLIN, H. (1928). Entwicklungsgeschichtliche Florideen Studien. Lunds Univ. Årsskr. N.F. Avd. 2, 24 (4), 1–127.

ROSENVINGE, L.K. (1917). The marine algae of Denmark. Part II. Rhodophyceae (Cryptonemiales). K. danske Vidensk. Selsk. Biol. Skr., 7 Raekke, Afd. 7, 153–283, Plates 3, 4.

The Marine Benthic Flora of Southern Australia Part IIIA complete list of references.

Author: H.B.S. Womersley

Publication: Womersley, H.B.S. (14 January, 1994)
The Marine Benthic Flora of Southern Australia
Rhodophyta. Part IIIA, Bangiophyceae and Florideophyceae (to Gigartinales)
Reproduced with permission from The Marine Benthic Flora of Southern Australia Part IIIA 1994, by H.B.S. Womersley. Australian Biological Resources Study, Canberra. Copyright Commonwealth of Australia.

Illustration in Womersley Part IIIA, 1994: FIG 47 F–H.

Figure 47 image

Figure 47   enlarge

Fig. 47. A–E. Peyssonnelia boudouresquei (A, B, D, E, AD, A19608; C, AD, A15184). A. RVS of thallus with separated cortical filaments and tetrasporangia. B. Basal filaments near margin. C. Basal filaments in mature thallus. D. Thallus with carposporangia. E. Two spermatangial heads. F–H. Peyssonnelia dubyi (F, G, AD, A15071; H, AD, A61151). F. RVS of thallus. G. Basal filaments with flabellules. H. RVS of thallus with tetrasporangia. I-0. Peyssonnelia inamoena (AD, A59853). 1. RVS of thallus. J. Surface (upper) pattern of erect filaments. K. Basal filaments. L. Carpogonial branch. M. Young carposporangia from connecting filament. N. Carposporangia in a female nemathecium. 0. Mature carposporangia.

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