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Genus EUPTILOCLADIA Wollaston 1968: 269

Phylum Rhodophyta – Order Ceramiales – Family Ceramiaceae – Tribe Crouanieae

Thallus erect, 5–15 cm high, much branched complanately and alternately distichously for 3–5 orders, with an axial filament bearing 4 whorl-branchlets from each cell, axes corticated below with rhizoids from the basal cells of whorl-branchlets. Lateral whorl-branchlets slightly longer than transverse ones, successively branched 3–5 times and with terminal unbranched filaments of short cells. Lateral branches arising from basal cells of whorl-branchlets, 2–5 cells long before initiation of whorl-branchlets; gland cells absent. Cells uninucleate.

Reproduction: Gametophytes probably dioecious. Procarps borne in place of a whorl-branchlet, with a supporting cell bearing a 4-celled carpogonial branch, and the carposporophytes with gonimolobes on a transversely elongate central cell, situated at the apices of short determinate lateral branches and surrounded by whorl-branchlets. Spermatangia unknown. Tetrasporangia sessile on mid cells of whorl-branchlets, tetrahedrally divided.

Type species: E. spongiosa Wollaston 1968: 269.

Taxonomic notes: A genus of 3 species, two from southern Australia and E. magruderi Abbott & Norris (1993, p. 451) from the Hawaiian Islands, distinguished by the complanately branched thalli with 4 whorl-branchlets, 2 longer ones in the plane of branching, and terminal rows of short cells to the whorl-branchlets.


ABBOTT, I.A. & NORRIS, R.E. (1993). New species of Ceramiaceae (Rhodophyta) from the Hawaiian Islands. Phycologia 32, 451–461.

WOLLASTON, E.M. (1968).Morphology and taxonomy of southern Australian genera of Crouanieae Schmitz (Ceramiaceae, Rhodophyta). Aust. J. Bot. 16, 217–417.

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

Author: E.M. Wollaston & 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


1. Whorl-branchlets with terminal rows of more-or-less isodiametric cells 8–10 µm in diameter; tetrasporangia 35–60 µm in diameter

E. spongiosa

1. Whorl-branchlets with terminal rows of cells with L/D 1–1.5 and 14–22 µm in diameter; tetrasporangia 80–130 µm in diameter

E. villosa

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