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Genus Lastreopsis Family Dryopteridaceae

Description: Terrestrial ferns, rhizome usually creeping, but erect in a few species, covered with narrow-lanceolate scales.

Fronds 2-pinnate or more compound; main rachis bordered by 2 ridges that are continuous with the thickened margin of the basal segments of pinnae; channel of the rachis covered with long or short hairs; veins free.

Sori circular, usually indusiate (absent in 1 species), the indusium reniform or rarely peltate, glabrous or hairy.


Photo © ANBG

Distribution and occurrence: World: c. 36 species, pantropical & southern temperate regions. Australia: 15 species, Qld, N.S.W., Vic., Tas., S.A.

Text by Peter G. Wilson
Taxon concept:

Taxa not yet included in identification key
Lastreopsis nephrodioides

 Key to the species 
1Fronds with main rachises densely covered with spreading, dark red-brown bristle-like scales with tuberculate basesLastreopsis hispida
Fronds with main rachises covered with soft hairs or ± glabrous, sometimes with a few short, ovate or lanceolate scales2
2Rhizomes short and erect or oblique, fronds tufted; indusia glabrous; upper pinnae without basal lobes fused to rachis3
Rhizomes short- to long-creeping; indusia absent or bearing oblong or rounded glandular hairs; upper pinnae often with basal lobes fused to rachis
                       Back to 1
4
3Fronds 3–4-pinnate; axes almost glabrous, except in the channel of the rachis; lamina dark greenLastreopsis smithiana
Fronds 2–3-pinnate; axes covered with relatively long, soft, spreading hairs; lamina pale green
                       Back to 2
Lastreopsis acuminata
4Marginal teeth of the ultimate segments distinctly aristateLastreopsis munita
Marginal teeth of ultimate segments never distinctly aristate but sometimes acute
                       Back to 2
5
5Mature indusia black or very dark brownLastreopsis marginans
Mature indusia light brown, although often with a dark centre
                       Back to 4
6
6Ultimate segments with acute to acuminate apexLastreopsis decomposita
Ultimate segments with obtuse apex; rhizome long- creeping
                       Back to 5
7
7Margins of ultimate segments toothed, teeth acute with thickened tips; stipes, rachises and veins often bearing rather dense, short or long pale brown hairs, sometimes glabrousLastreopsis microsora
Margins of ultimate segments crenate; stipes, rachises and veins bearing dense, soft pale to reddish brown hairs
                       Back to 6
Lastreopsis silvestris

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