Electronic Flora of South Australia Species Fact Sheet
Phylum Chlorophyta – Order Ulvales – Family Ulvaceae
Thallus (Fig. 42C) light green, delicate, 6–12 cm high, deeply lacerate into numerous linear to narrowly cuneate, straight to slightly curved, segments 2–15 (–20) mm broad with rounded to truncate ends, arising from a small, semi-prostrate region attached on the lower side by numerous slender rhizoids (Fig. 43F,G) to 0.5 mm long; thallus 50–75 µm thick below, decreasing to 30–40 µm thick above. Cells (Fig. 43E) in surface view polygonal with rounded to narrowly angular ends, tending to form lengthwise rows, 25–50 (–85) µm long and 10–25 (–35) µm broad; cells often separated by elongate slits (Fig. 43E), some leading to laceration of the thallus; in sectional view cells (0.7–) 1–1.5 times as high as broad, walls 4–5 µm thick; chloroplast filling most of the cell, with 3–5 pyrenoids.
Reproduction: Reproduction unknown.
Type from 12 km S. of Vivonne Bay, Kangaroo I., S. Aust., from craypots 50–70 m deep (Lat.:, 24.xi.1968); in ADU, A33006.
Distribution: Only known from the type and from Pearson I., S. Aust., 22–50 m deep (Shepherd, Jan. 1969, several collections in ADU, e.g. 10.i.1969; A34107).
Taxonomic notes: U. shepherdii is provisionally placed in Ulvaria until its reproduction can be investigated. It appears to be confined to deep water habitats.
WOMERSLEY, H.B.S. (1971a). New records and taxa of marine Chlorophyta in southern Australia. Trans. R. Soc. S. Aust. 95, 113–120.
The Marine Benthic Flora of Southern Australia Part I complete list of references.
Womersley, H.B.S. (31 May, 1984)
The Marine Benthic Flora of Southern Australia
©Board of the Botanic Gardens and State Herbarium, Government of South Australia
Illustrations in Womersley Part I, 1984: FIGS 42C, 43 E–G.
Figure 42 enlarge
Fig. 42. A. Percursaria percursa (ADU, A52661). B. Ulvaria oxysperma (ADU, A31812). C. Ulvaria shepherdii (ADU, A33006). D. Blidingia minima (ADU, A31811). E. Blidingia marginata (ADU, A21065).
Figure 43 enlarge
Fig. 43. A,B. Percursaria percursa (ADU, A52661). A. Biseriate filament, face view. B. Side view of filament. C,D. Ulvaria oxysperma (ADU, A31874). C. Cells near thallus margin. D. Lower part of thallus with cells developing attachment rhizoids. E–G. Ulvaria shepherdii (ADU, A33006). E. Cells in upper thallus. F. Lower cells with rhizoids. G. Cross section of thallus near base, with rhizoid producing cells. H,I. Blidingia minima (ADU, A53181). H. Cells in upper thallus. I. Base of thallus. J,K. Blidingia marginata (ADU, A52990). J. Cells in upper thallus. K. Base of thallus.
State Herbarium of South Australia