In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), the genus is placed in the subfamily Lycopodioideae.

[5] Pseudolycopodium densum is native to Australia, the North Island of New Zealand and New Caledonia.

It is found in a wide variety of situations, often in high rainfall areas on sandy soils.

This placement is accepted in the Pteridophyte Phylogeny Group classification of 2016 (PPG I),[4] and by the Checklist of Ferns and Lycophytes of the World as of June 2024[update].

[3][6][7][9][10][11][12][13][14] Pseudolycopodium (as Lycopodium deuterodensum) grows in open forest, scrub or heath in eastern New South Wales, southern Victoria, Tasmania (including Bass Strait Islands, Queensland, South Australia the North and Chatham Islands of New Zealand and in New Caledonia.