Electronic Flora of South Australia Genus Fact Sheet

Genus PRASIOLA (C. Agardh) Meneghini 1838: 360

Phylum Chlorophyta – Order Prasiolales

Thallus usually under 1 (–2) cm high, foliose, monostromatic, basally attached by rhizoids and often stipitate, usually with cells arranged in square to rectangular blocks and often in smaller groups of four; chloroplast stellate to laminate, with a central pyrenoid.

Reproduction: Reproduction by non-motile mitospores, and by oogametes formed following division of haploid cells derived by meiosis from upper thallus cells.

Type species: Not designated.

Taxonomic notes: A genus of about 12 species (Knebel 1936), freshwater and marine, often growing above high tide level. The monostromatic, foliose blades, with cells regularly arranged in groups (from fours to large blocks) distinguish the genus.

References:

KNEBEL, G. (1936). Monographie der Algenreihe der Prasiolales, insbesondere von Prasiola crispa. Hedwigia 75, 1–120, 3 maps.

MENEGHINI, G. (1838). Cenni sulla organografia e fisiologia delle Alghe. Nuovi Saggi Imp. Regia Accad. Sci. Padova 4, 324–388.

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

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 SPECIES OF PRASIOLA

1. Thallus developing a discoid holdfast producing several stipitate blades 1–4 mm high 1

P. stipitata

1. Thallus feebly attached by a few rhizoids only (without a distinct holdfast), irregularly expanded and crisped, usually 2–5 mm high or across, occasionally foliose and to 2 cm across

P. crispa


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