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Electronic Flora of South Australia Species Fact Sheet

Acrosorium minus (Sonder) Kylin 1924: 78.

Phylum Rhodophyta – Family Delesseriaceae

Selected citations: Huisman & Walker 1990: 428. May 1965: 403. Silva et al. 1996: 446.


Cryptopleura minor Sonder 1845: 57; 1848: 194. Kützing 1849: 870; 1866: 10, pl. 26a, b.

Nitophyllum minus (Sonder) Harvey 1849a: 119; 1855a: 549; 1863, synop.: xxxii. J. Agardh 1852: 655; 1876: 467; 1898: 66. De Toni 1900: 651. De Toni & Forti 1923: 33. Lucas 1909: 35; 1926: 603, pl. 42 figs 4, 5; 1929b: 50. Lucas & Perrin 1947: 223. Sonder 1880: 23. Tate 1882a: 20.

Scutarius minor (Sonder) Kuntze 1891: 920.

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

Taxonomic notes: The type of Acrosorium minus is in MEL, 603107, and consists of an envelope labelled Cryptopleura minor Sond. pl. Preiss. Nov. Holl. occid. legt Preiss, with Nitophyllum minus Sond. above Sonder's original name. Inside are several fragmentary specimens (Fig. 69E), two about 3 cm long, some on mica. These specimens are complanately and alternately branched, branches 1–2 mm broad, mainly tristromatic and with fine veins (Fig. 69F), but do not show any uncinate branch ends. Harvey's Alg. Aust. Exsicc. 296a specimens, from the Swan R., and Clifton's from Fremantle, regarded as N. minus by Harvey, are mostly the same species (one sheet, AD, A18217, is a Rhodophyllis) as do specimens of Huisman from Penguin I., W. Aust., 12 m deep (Huisman, 9.ii.1994; MURU, JH585). However, Sonder's and most of Harvey's specimens are sterile, but JH585 and a few others have sparse tetrasporangial sori scattered on the upper branches.

A. minus has been recorded from numerous localities in southern Australia, as far east as Port Phillip, Victoria. In habit, the specimens are usually similar to small and slender Hymenena multipartita. Characterisation of A. minus depends on new collections of the species from the Fremantle region, including at least tetrasporangial specimens, to judge whether it is best placed in Acrosorium or Hymenena and its relationship to H. multipartita. Kylin (1929, pp 11, 14) considered A. minus was close to the New Zealand A. decumbens (J. Agardh) Kylin (1929, p. 10, fig. 18).

* Species of uncertain status.

This species is uncertain, based on inadequately known material, lack of the type specimen, or an isolated record.


AGARDH, J.G. (1852). Species Genera et Ordines Algarum. Vol. 2, Part 2, pp. 337–720. (Gleerup: Lund.)

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

AGARDH, J.G. (1898). Species Genera et Ordines Algarum. Vol. 3, Part 3 - De dispositione Delesseriearum. (Gleerup: Lund.)

DE TONI, G.B. & FORTI, A. (1923). Alghe di Australia, Tasmania e Nouva Zelanda. Mem. R. Inst. Veneto Sci., Lett. Arti 29, 1–183, Plates 1–10.

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

HARVEY, W.H. (1849a). Nereis Australis, pp. 65–124, Plates 26–50. (Reeve: London.)

HARVEY, W.H. (1855a). Some account of the marine botany of the colony of Western Australia. Trans. R. Jr. Acad. 22, 525–566.

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

HUISMAN, J.M. & WALKER, D.I. (1990). A catalogue of the marine plants of Rottnest Island, Western Australia, with notes on their distribution and biogeography. Kingia 1, 349–459.

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

KÜTZING, F.T. (1866). Tabulae Phycologicae. Vol. 16. (Nordhausen.)

KUNTZE, O. (1891). Revisio generum Plantarum. Part II. 4. Algae, pp. 877–930. (Leipzig.)

KYLIN, H. (1924). Studien über die Delesseriaceen. Lunds Univ. Årsskr. N.F. Avd. 2, 20(6), 1–111.

KYLIN, H. (1929). Die Delesseriaceen Neu-seelands. Lunds Univ. Årsskr. N.F. Avd. 2, 25(2), 1–15, Plates 1–12.

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. (1926). Notes on Australian marine algae. III. The Australian species of the genus Nitophyllum. Proc. Linn. Soc. N.S.W. 51, 594–607, Plates 37–45.

LUCAS, A.H.S. (1929b). A census of the marine algae of South Australia. Trans. R. Soc. S. Aust. 53, 45–53.

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.

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.G. (1845). Nova Algarum genera et species, quas in itinere ad oras occidentales Novae Hollandiae, collegit L. Preiss, Ph.Dr. Bot. Zeit. 3, 49–57.

SONDER, O.W. (1848). Algae. In Lehmann, C., Plantae Preissianae. Vol. 2, pp. 161–195. (Hamburg.)

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

TATE, R. (1882a). A list of the charas, mosses, liverworts, lichens, fungs, and algals of extratropical South Australia. Trans. R. Soc. S. Aust. 4, 5–24.

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

Author: H. B. S. Womersley

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.

Illustration in Womersley Part IIIA, 2003: FIG. 69E, F.

Figure 69 image

Figure 69   enlarge

Fig. 69. A–D. Delesseria crassinervia (AD, A48823). A. Habit. B. Apical segmentation. C. Mature margin and blade. D. Blade with tetrasporangia (all from dried material). E, F. Acrosorium minus (Type, MEL, 603107). E. Fragments in type folder. F. Surface view of frond with veins.

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