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Electronic Flora of South Australia Genus Fact Sheet

Genus MYRIOGRAMME Kylin 1924: 55

Phylum Rhodophyta – Family Delesseriaceae

Thallus foliose to irregularly and profusely branched, often with a midrib or central thickened area near the base but without microscopic veins, monostromatic becoming tri- or polystromatic; holdfast discoid or fibrous. Structure. Growth marginal and intercalary, without apical cells, tri- or polystromatic parts with cells equivalent. Cells multinucleate.

Reproduction: Gametophytes dioecious. Procarps scattered, often on both sides of a primary cell which bears a cover cell and fertile pericentral cell with 2 sterile groups and a 4-celled carpogonial branch. Carposporophyte with an extensive basal fusion cell and much branched gonimoblast bearing terminal chains of carposporangia, sometimes with lateral clusters also. Cystocarps domed; pericarp ostiolate, several cells thick. Spermatangial sori scattered, with the primary cells bearing a layer of cortical initials which produce elongate spermatangia.

Tetrasporangial sori scattered, with 2–3 layers of cortical cells, tetrasporangia produced from the primary cells and often from inner cortical cells.

Type species: M. livida (Hooker & Harvey) Kylin 1924: 58.

Taxonomic notes: The type species has been investigated in detail by Hommersand & Fredericq (I 997a), who established the tribe Myriogrammeae for the group of Kylin (1924, p. 53). They consider the tribe to also include Gonimiocolax Kylin, Haraldiophyllum Zinova and Hideophyllum Zinova.

Myriogramme is a large genus of 10–15 species, but most members need study in relation to the type species. Specimens from Tasmania attributed to the Antarctic and New Zealand M multinervis (Hooker & Harvey) Kylin by Harvey (1859b, p. 313) were not located and this record remains uncertain.


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.)

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

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.


1. Thallus usually 10–20 cm high, irregularly branched, branches 1–3 (–5) cm broad

M gunniana

1. Thallus 4–8 cm high, irregularly subdichotomous, branches 2–6 mm broad

M cartilaginea

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