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Diapse ptilota (Hooker & Harvey) Kylin 1956: 390, fig. 307D.

Phylum Rhodophyta – Order Ceramiales – Family Ceramiaceae – Tribe Ptiloteae


Thamnocarpus ptilota Hooker & Harvey 1847: 409. J. Agardh 1851: 103.

Carpothamnion ptilota (Hooker & Harvey) Kützing 1849: 669.

Ptilota jeannerettii Harvey 1859b: 331; 1862, pl. 198. J. Agardh 1876: 80. Sonder 1881: 11.

Euptilota jeannerettii (Harvey) Schmitz 1896: 7. De Toni 1903: 1372. Lucas 1909: 50; 1929a: 25.

Thallus (Fig. 167A) erect, dark red, 10–30 cm high, pinnately and complanately branched for 4 or 5 orders, laterals distichous, dense, more or less opposite, becoming densely corticated from very close to apices, all branches slightly compressed, main branches 1–2 mm broad, lesser branches 0.5–1 mm broad. Holdfast conical, rhizoidal, 2–10 mm across, usually bearing a single stipe; epilithic. Structure. Apical filaments (Fig. 167B) of axes and branches oppositely branched, with slightly oblique cross walls, apical cells 15–20 µm in diameter and L/D 0.7–1, enlarging slightly in subapical cells which cut off distichous laterals with alternate ones developing further; axial filament enlarging to 80–120 µm in diameter with cells L/D 1.3–2. Cortex cut off from axial and lateral filaments from shortly below the apices, becoming 250–400 µm and several cells thick with rhizoidal filaments around the axial cells (Fig. 167C) and between inner cortical cells, outer cells more or less isodiametric and 6–10 µm across. Cells uninucleate; rhodoplasts discoid.

Reproduction: Reproductive bodies borne on cells of short dense tufts of filaments 220–500 µm long, on the margins of the branches, each tuft with an axial filament bearing alternate lateral branchlets; carpogonial branches situated 3–4 cells below apical cells of the tufts. Carposporophytes (Fig. 167D, E) terminal on short lateral branches, with compact globular involucres 200–380 µm across, gonimolobe(s) with ovoid carposporangia 15–20 µm across; involucral filaments (Fig. 167E) arising below the carposporophyte, simple or branched, curved, 30–40 IIM in diameter, cells more or less isodiametric. Spermatangia unknown.

Tetrasporangia (Fig. 167F) borne laterally or terminally on cells of the tufts, subspherical to slightly ovoid, 35–50 µm across, decussately to tetrahedrally divided.

Type from Port Arthur, Tas.; lectotype in Herb. Hooker, BM.

Selected specimens: Robe, S. Aust., drift (Womersley. 18.v.1964; AD, A27845). 1.3 km off Cape Northumberland, S. Aust., 15 m deep (Shepherd, 3.vii.1975; AD, A46371). Double Corner Beach, Portland, Vic., drift (Beauglehole, 5.viii.1951; AD, A21629). W of Lawrence Rock, Portland, Vic., 24–30 m deep (Owen, 2.ix.1971; AD, A39667), Port Campbell, Vic., drift (Womersley, 12.viii.1970; AD, A36028). Tesselated Pavements, Eaglehawk Neck, Tas. (Nash, 12.xii.1934; AD, A49957-Tilden, "South Pacific Plants", Ser. 2, No. 236). Fluted Cape, Bruny I., Tas., 16 m deep (Shepherd, 10.ii.1972; AD, A41527).

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

Distribution: Robe, S. Aust., to Port Phillip Heads, Vic. (Harvey) and E Tasmania.

Taxonomic notes: Harvey (1859, p. 331) changed his earlier Thamnocarpus ptilota to Ptilota jeannerettii presumably to honour the original collector, Dr Jeannerett.


AGARDH, J.G. (1851). Species Genera et Ordines Algarum. Vol. 2, Part 1, I-XII, 1–336 + index. (Gleerup: Lund.)

AGARDH, J.G. (1876). Species Genera et Ordines Algarum. Vol. 3, Part 1- Epicrisis systematic Floridearum, pp. i-vii, 1–724. (Weigel: Leipzig.)

DE TONI, G.B. (1903). Sylloge Algarum omnium hucusque Cognitarum. Vol. 4. Florideae. Sect. 3, pp. 775–1521 + 1523–1525. (Padua.)

HARVEY, W.H. (1859b). Algae. In Hooker, J.D., The Botany of the Antarctic Voyage. III. Flora Tasmaniae. Vol. II, pp. 282–343, Plates 185–196. (Reeve: London.)

HARVEY, W.H. (1862). Phycologia Australica. Vol. 4, Plates 181–240. (Reeve: London.)

HOOKER, J.D. & HARVEY, W.H. (1847). Algae Tasmanicae. Lond. J. Bot. 6, 397–417.

KÜTZING, F.T. (1849). Species Algarum. (Leipzig.)

KYLIN, H. (1956). Die Gattungen der Rhodophyceen. (Gleerups: Lund.)

LUCAS, A.H.S. (1909). Revised list of the Fucoideae and Florideae of Australia. Proc. Linn. Soc. N.S.W. 34, 9–60.

LUCAS, A.H.S. (1929a). The marine algae of Tasmania. Pap. Proc. R. Soc. Tasm. 1928, 6–27.

SCHMITZ, F. (1896). Kleinere beitrage zur kenntniss der Florideen. Nuova Notarisia, Padova 7, 1–22.

SONDER, O.W. (1881). In Mueller, F., Fragmenta Phytographiae Australiae. Supplementum ad volumen undecinum: Algae Australianae hactenus cognitae, pp. 1–42, 105–107. (Melbourne.)

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

Author: H.B.S. Womersley

Publication: Womersley, H.B.S. (24 December, 1998)
The Marine Benthic Flora of Southern Australia
Rhodophyta. Part IIIC. Ceramiales – Ceramiaceae, Dasyaceae
©State Herbarium of South Australia, Government of South Australia

Illustration in Womersley Part IIIA, 1998: FIG. 167.

Figure 167 image

Figure 167   enlarge

Fig. 167. Diapse ptilota (A, C, F, AD, A46371; B, D, E, AD, A 18416). A. Habit. B. Branch apex with opposite lateral branchlets. C. Transverse section of branch. D. Branch with involucrate carposporophytes. E. Two involucrate carposporophytes with escaping carposporangia. F. A branch with tetrasporangia.

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