Electronic Flora of South Australia Family Fact Sheet

FAMILY ULVACEAE Lamouroux

Phylum Chlorophyta – Order Ulvales

Thallus tubular, membranous, or of biseriate filaments, attached or free floating. Cells with parietal, laminate or cup-shaped chloroplasts with 1–4 pyrenoids.

Life history diplohaplontic and isomorphic, but some taxa asexual.

References: The Marine Benthic Flora of Southern Australia Part I

Author: H.B.S. Womersley

Publication: Womersley, H.B.S. (31 May, 1984)
The Marine Benthic Flora of Southern Australia
Part I
©Board of the Botanic Gardens and State Herbarium, Government of South Australia

KEY TO GENERA OF ULVACEAE

1. Thallus of uniseriate or usually biseriate filaments, loose-lying as entangled masses

PERCURSARIA

1. Thallus tubular or membranous, usually basally attached

2

2. Thallus membranous, monostromatic or distromatic

3

2. Thallus tubular and hollow, at least near the base and margins

4

3. Thallus monostromatic throughout

ULVARIA

3. Thallus distromatic throughout, often with rhizoids between the cell layers near the thallus base

ULVA

4. Thallus with a basal, cellular attachment disc, without rhizoids, cells of thallus less than 10 µm across in surface view, chloroplast stellate with a single central pyrenoid

BLIDINGIA

4. Thallus basally attached by rhizoids from the lower cells, thallus cells usually 12–25 µm across in surface view, chloroplast laminate with one to several pyrenoids

ENTEROMORPHA


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