The Lycopodiales of the British Isles (Isoetes, Lycopodium, Selaginella)


L. Watson and M. J. Dallwitz

Lycopodium clavatum L.

“Common Clubmoss”, “Stag’s-Horn Moss”.

Morphology. Stems elongated, with numerous small leaves; creeping, and rooting directly at intervals along their length; 30–100 cm long; ostensibly monopodial vegetatively; without secondary thickening. Leaves eligulate; 3–5 mm long; with long, filiform hair-like tips.

Homosporous. Sporophylls aggregated into well defined terminal cones. Cones 1–2(-3), on long, erect peduncles which bear distant, appressed, scale-like leaves. The sporangia basal and subsessile on the adaxial surfaces of the sporophylls, non-septate.

Ecology and distribution. Lowland, upland and montane; heaths, moors and montane grassland, ascending to about 900 m. Throughout the British Isles, but scarce in lowland areas.

Classification. Family Lycopodiaceae.

Ilustrations. • L. clavatum (Sowerby and Johnson, 1859). • L. clavatum: Eng. Bot. 1833 (1886). • British Lycopods: Sowerby and Johnson (1863).

To view the illustrations with detailed captions, go to the interactive key. This also offers full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, and distributions of character states within any set of taxa.

Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2007 onwards. The Lycopodiales of the British Isles (Isoetes, Lycopodium, Selaginella). Version: 1st September 2009.’.