The Lycopodiales of the British Isles (Isoetes, Lycopodium, Selaginella)
Morphology. Stems elongated, with numerous small leaves; creeping, and rooting directly at intervals along their length; 30–60 cm long; ostensibly monopodial vegetatively; with non-flattened branches; without secondary thickening. Leaves eligulate; not 4-ranked; 4–6 mm long; spreading; not hair-pointed.
Homosporous. Sporophylls differing markedly from the foliage leaves; aggregated into well defined terminal cones. Cones solitary, sessile at the tips of the normal shoots. The sporangia basal and subsessile on the adaxial surfaces of the sporophylls, non-septate.
Ecology and distribution. Upland and montane; moors on mountains, ascending to about 900 m. Local in England and Scotland, extinct in Wales and absent from Ireland(?).
Classification. Family Lycopodiaceae.
Ilustrations. • L. annotinum (Sowerby and Johnson, 1859). • 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. http://delta-intkey.com’.