''Dendrolycopodium dendroideum'',

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''Lycopodium dendroideum'', known as tree groundpine, is a North American species of clubmoss. It is part of a complex of species colloquially known as groundpine, which taxa were formerly lumped into the species '' Lycopodium obscurum''. The species is native to Russia and also to the colder parts of North America (all states and provinces in Canada except

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; northern and east-central United States including Alaska). The genus '' Dendrolycopodium'' is accepted in the

Pteridophyte Phylogeny Group The Pteridophyte Phylogeny Group (PPG) is an informal international group of systematic botanists who collaborate to establish on the classification of pteridophytes ( lycophytes and ferns) that reflects knowledge about plant relationships discove ...

classification of 2016 (PPG I), but not in other classifications, which submerge the genus in '' Lycopodium''. ''Dendrolycopodium dendroideum'' prefers humus-rich, sandy, moist but not completely saturated soils. It is very similar to '' D. obscurum'' except for side shoots that are round in cross-section rather than flat, and having leaves all the same size.Flora of North America, ''Lycopodium dendroideum'' Michaux, Fl. Bor.-Amer. 2: 282. 1803. Prickly tree club-moss, lycopode dendroïde
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Uses

Historically, this and other related clubmosses had been collected for decorative

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greenery. Overharvesting clubmosses destroys the slow growing, increasingly rare plant. The spore of this species was also collected as Lycopodium powder for use in early photography, although this was not the preferred species for the purpose.

References

Lycopodiaceae Flora of Northern America Flora of Russia Plants described in 1803 {{Lycophyte-stub