Microsoroideae

Microsoroideae is a subfamily in the fern family Polypodiaceae in the Pteridophyte Phylogeny Group classification of 2016 (PPG I). The subfamily is also treated as the tribe Microsoreae within a very broadly defined family Polypodiaceae "sensu lato". In either treatment, it includes the previously separated tribe Lepisoreae.
Taxonomy.
The taxonomy of the subfamily Microsoroideae has been described as "highly problematic". The division into genera varies considerably. The Pteridophyte Phylogeny Group classification of 2016 (PPG I) recognized the following genera, while accepting that some needed further evaluation:
A molecular phylogenetic study in 2019 suggested the following relationship between the PPG I genera ("Thylacopteris" was not included in the study):
Species placed in the PPG I genera "Lepidomicrosorium", "Neocheiropteris", "Neolepisorus" and "Tricholepidium" were intermingled in a single clade. Although "Lemmaphyllum" and "Lepisorus" s.s. were monophyletic, the authors suggested a single broadly circumscribed "Lepisorus" s.l. for all of these genera. Three clades, mainly comprising species previously placed in "Microsorum", were closely related to "Lecanopteris" s.s. and distinct from other clades in the subfamily. Rather than expanding the circumscription of "Lecanopteris", the authors of the study preferred to use four genera, reviving "Dendroconche" and erecting two new genera "Bosmania" and "Zealandia".
, "Lepisorus" s.l. and "Lecanopteris" s.l. are treated differently by PPG I, the "Checklist of Ferns and Lycophytes of the World" (CFLW) and "Plants of the World Online" (PoWO), as shown in the following tables.