Electronic Flora of South Australia
Electronic Flora of South Australia
Census of SA Plants, Algae & Fungi
Identification tools

Electronic Flora of South Australia Species Fact Sheet

Haplodasya urceolata (Harvey ex J. Agardh)Parsons 1975: 672, figs 34, 35, 47A.

Phylum Rhodophyta – Family Rhodomelaceae – Tribe Lophothalieae

Selected citations: Silva et al. 1996: 440.


Dasya urceolata Harvey ex J. Agardh 1863: 1208; 1890: 106. De Toni 1903: 1209. Harvey 1863, synop.: xxiv. Lucas & Perrin 1947: 314. Womersley 1950: 182.

Haplodasya reinboldii Falkenberg ex Schmitz & Falkenberg 1897: 475. Falkenberg 1901: 628, pl. 18 figs 22–25. De Toni 1903: 1241. Lucas 1912: 159. Lucas & Perrin 1947: 320. May 1965: 380.

Sarcomenia rhizocarpa Harvey 1863, synop.: xvii. De Toni 1900: 736. Lucas 1909: 37. Sonder 1880: 33.

Thallus (Fig. 102A) light to dark red-brown, (1–) 5–15 cm high, with one to several erect axes laterally and radially branched for 3–4 orders, pyramidal in form, axes and branches terete, with 5 (rarely 4) pericentral cells, corticated from close to apices, clothed with branched rhodoplastic trichoblasts, denuded below. Attachment by a mass of tissue with the host receptacles; epiphytic on several species of Cystophora (C. intermedia, C. subfarcinata, C. moniliformis, C. congesta, C. retorta) and on Carpoglossum confluens, but not on Cystophora siliquosa. Structure monopodial (Fig. 103A), apical cells dome shaped, trichoblasts arising on a 1/4 or 1/5 spiral close to apices, with (usually) 5 pericentral cells cut off from 8–10 segments below apices in alternating sequence. Young branches 100–200 µm in diameter with segments L/D 0.8–1.2, mature corticated axes 200–600 µm in diameter. Trichoblasts (Fig. 102B) formed spirally, on each segment, 0.5–2 mm long, with spirally arranged branches, basally branched 2 or 3 times, 1–2 cells apart, with long unbranched ends (Fig. 103B), basal and mid cells 30–60 µm in diameter and L/D 2–7; tapering gradually to upper cells 15–30.pm in diameter and L/D 2–8; adventitious monosiphonous filaments absent apart from on basal cells of trichoblasts. Cortication commencing 15–20 segments from apices, becoming heavy on lower axes with inner cortical cells of similar size to pericentral cells, then decreasing to small outer cortical cells. Lateral branches arising from trichoblasts. Cells uninucleate; rhodoplasts discoid.

Reproduction: Gametophytes dioecious. Procarps (Fig. 103C) arising on the second or third segment of a trichoblast, which develops 5 pericentral cells, the last formed bearing a sterile cell group and a 4-celled carpogonial branch. Carposporophyte with a basal fusion cell and branched gonimoblast bearing clavate terminal carposporangia 25–35 µm in diameter. Cystocarps (Fig. 102B) sessile or short-stalked, urceolate, 350–650 µm in diameter, with a short, slightly flared neck; pericarp ostiolate, with about 12 erect filaments, each cell with 2 isodiametric outer cells and 1–2 layers of smaller cortical cells. Spermatangial organs (Figs 102C, 103D) borne as branches of trichoblasts, elongate-lanceolate, 100–250 µm long and 35–55 µm in diameter, with 1–2 basal and apical sterile cells, without trichoblasts themselves, with the axial cells bearing 3 pericentral cells (Fig. 103E) forming inner initials and an outer layer of spermatangia.

Tetrasporangial stichidia (Fig. 102D) borne as ultimate branches of trichoblasts or adventitious filaments, 180–550 (–700) µm long and 80–110 µm in diameter, with 1–4 sterile basal and 1–2 sterile apical cells, without trichoblasts themselves, with 4 pericentral cells (Fig. 103F) and 8–12 fertile segments, sporangia in a straight longitudinal row, 45–90 µm in diameter, with 2 pre-sporangial and 1 post-sporangial cover cells.

Type from Port Fairy, Vic., holotype in Herb. Agardh, LD, 44282 (Harvey, Alg. Aust. Exsicc. 217D).

Selected specimens: Sarge Bay, Cape Leeuwin, W. Aust., on Cystophora retorta, drift (Parsons, 16.xi. / 968; AD, A34203). Esperance, W. Aust., on C. subfarcinata, reef edge, 3rd Beach (Parsons, 21.xi.1968; AD, A33347). Head of Great Australian Bight, S. Aust., on C. moniliformis, drift (Parsons, 4.xi.1968; AD, A32943). Sleaford Bay, Port Lincoln, S. Aust., on C. subfarcinata, reef edge (Womersley, 20.viii.1967; AD, 31857). Wanna, S. Aust., on C. moniliformis, upper sublittoral (Parsons, 15.v.1968; AD, A32580). Rosetta Bay, Victor Harbor, S. Aust., on Carpoglossum, drift (Womersley, 3.xi.1997; AD, A67303). Victor Harbor, S. Aust., on C. moniliformis, drift (Womersley, 17.x.1948: AD, A9260). Seal Bay, Kangaroo I., S. Aust., on Carpoglossum, drift (Parsons, 22.xi.1968; AD, A32957). Pennington Bay, Kangaroo I., S. Aust., on C. intermedia, sublittoral fringe (Parsons, 17.xi.1967; AD, A32057-"Marine Algae of southern Australia" No. 180) and on C. moniliformis, sublittoral fringe (Womersley, 9.x.1997; AD, A67287). Robe, S. Aust., on C. moniliformis, upper sublittoral, West Beach (Parsons, 15.v.1967; AD, A32068). Port MacDonnell, S. Aust., on C. moniliformis, upper sublittoral (Parsons, 11.ii.1968; AD, A32578).

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

Distribution: Cape Leeuwin, W. Aust., to Port Fairy, Victoria.

Taxonomic notes: H. urceolata is distinct in habit compared to H. tomentosa and also lacks the adventitious filaments of the latter, which also occurs only on Cystophora siliquosa.


AGARDH, J.G. (1863). Species Genera et Ordines Algarum. Vol. 2, Part 3, pp. 787–1291. (Gleerup: Lund.)

AGARDH, J.G. (1890). Till algernes systematik. Acta Univ. lund. 26(3), 1–125, Plates 1–3.

DE TONI, G.B. (1900). Sylloge Algarum omnium hucusque Cognitarum. Vol. 4. Florideae. Sect. 2. pp. 387–776. (Padua.)

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

FALKENBERG, P. (1901). Die Rhodomelaceen des Golfes von Neapel und der angrenzenden Meeres-abschnitte. Fauna und Flora des Golfes von Neapel. Monogr. 26. (Friedländer: Berlin.)

HARVEY, W.H. (1863). Phycologia Australica. Vol. 5, Plates 241–300, synop., pp. i-lxxiii. (Reeve: London.)

LUCAS, A.H.S. & PERRIN, F. (1947). The Seaweeds of South Australia. Part 2. The Red Seaweeds. (Govt Printer: Adelaide.)

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. (1912). Supplementary list of the marine algae of Australia. Proc. Linn. Soc. N.S.W. 37, 157–171.

MAY, V. (1965). A census and key to the species of Rhodophyceae (red algae) recorded from Australia. Contr. N.S. W. Natl Herb. 3, 349–429.

PARSONS, M.J. (1975). Morphology and taxonomy of the Dasyaceae and Lophothalieae (Rhodomelaceae) of the Rhodophyta. Aust. J. Bot. 23(4), 549–713.

SCHMITZ, F. & FALKENBERG, P. (1897). Rhodomelaceae. In Engler, A. & Prantl, K., Die natürlichen Pflanzenfamilien. T.1. Abt. 2, pp. 421–480. (Englemann: Leipzig.)

SILVA, P.C., BASSON, P.W. & MOE, R.L. (1996). Catalogue of the Benthic Marine Algae of the Indian Ocean. (Univ. California Press: Berkeley.)

SONDER, O.W. (1880). In Mueller, F., Fragmenta Phytographiae Australiae. Supplementum ad volumen undecinum: Algae Australianae hactenus cognitae, pp. 1–42, 105–107. (Melbourne.)

WOMERSLEY, H.B.S. (1950). The marine algae of Kangaroo Island. III. List of Species 1. Trans. R. Soc. S. Aust. 73, 137–197.

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

Author: H.B.S. Womersley & M.J. Parsons

Publication: Womersley, H.B.S. (24 February, 2003)
The Marine Benthic Flora of Southern Australia
Rhodophyta. Part IIID. Ceramiales – Delesseriaceae, Sarcomeniaceae, Rhodomelaceae
Reproduced with permission from The Marine Benthic Flora of Southern Australia Part IIID 2003, by H.B.S. Womersley. Australian Biological Resources Study, Canberra. Copyright Commonwealth of Australia.

Illustrations in Womersley Part IIIA, 2003: FIGS 102, 103.

Figure 102 image

Figure 102   enlarge

Fig. 102. Haplodasya urceolata (A, AD, A32057; B, AD, A67303; C, D, AD, A31857). A. Habit, epiphytic on Cystophora. B. Branch with young and mature cystocarps. C. Spermatangial organs. D. A cluster of stichidia.

Figure 103 image

Figure 103   enlarge

Fig. 103. Haplodasya urceolata (AD, A31857). A. Apex of axis showing pericentral cell formation. B. A short shoot with trichoblasts. C. A mature procarp. D. Mature spermatangial branches. E. Cross section of a spermatangial branch. F. Cross section of a stichidium. (All as in Parsons 1975, courtesy of Aust. J. Bot.)

Disclaimer Copyright Disclaimer Copyright Email Contact:
State Herbarium of South Australia
Government of South Australia Government of South Australia Government of South Australia Department for Environment and Water