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Electronic Flora of South Australia Genus Fact Sheet

Genus SONDERELLA Schmitz in Schmitz & Hauptfleisch 1897: 415. [Schmitz 1889: 446, nomen nudum]

Phylum Rhodophyta – Family Rhodomelaceae – Tribe Sonderelleae

Thallus erect, branched from the midrib, branches monostromatic, flat, linear, entire, 2–4 mm broad. Holdfast rhizoidal; epiphytic. Structure. Apical cell in a slight apical cleft, apices dorsiventral, the axial cell cutting off 4 pericentral cells (5 in fertile segments), 2 larger lateral cells and 2 smaller adaxial ones, with each of the lateral pericentral cells cutting off a pseudopericentral cell; lateral pericentral cells each forming 2 chains of wing cells; blades ecorticate, midrib corticate below. Branching adventitious from the pericentral or pseudopericentral cells. Trichoblasts absent.

Reproduction: Gametophytes dioecious, reproductive cells formed directly on the thallus surface. Procarps borne in series on the central of 3 adaxial pericentral cells, the supporting cell bearing 2 sterile cells and a 4-celled carpogonial branch. Carposporophyte with a basal fusion cell and branched gonimoblast with clavate terminal carposporangia. Cystocarps usually single per blade, ovoid, pericarp ostiolate, (3–) 4 cells thick. Spermatangial blades flat, ovate, with sterile axial and marginal cells, with a plate of initials producing elongate spermatangia.

Stichidia borne on the midrib, linear, compressed, corticated, with 2 rows of tetrasporangia cut off from opposite lateral pericentral cells.

Type (and only) species: S. linearis (Harvey) Schmitz 1897: 415.

Taxonomic notes: Schmitz (1889, p. 446) first used the name Sonderella but without giving a description; he validated it in 1897.


SCHMITZ, F. & HAUPTFLEISCH, P. (1897). Delesseriaceae. In Engler, A. & Prantl K., Die natürlichen Pflanzenfamilien. T. 1. Abt. 2. Pp. 406–416.

SCHMITZ, F. (1889). Systematische Übersicht der bisher bekannten Gattungen der Florideen. Flora, Jena 72, 435–456, Plate 21.

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

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.

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