Microsoroideae

Microsoroideae is a subfamily in the fern family Polypodiaceae in the Pteridophyte Phylogeny Group classification of 2016 (PPG I).[1] The subfamily is also treated as the tribe Microsoreae within a very broadly defined family Polypodiaceae sensu lato.[2] In either treatment, it includes the previously separated tribe Lepisoreae.

Microsoroideae
Lepisorus thunbergianus in Japan
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Class: Polypodiopsida
Order: Polypodiales
Suborder: Polypodiineae
Family: Polypodiaceae
Subfamily: Microsoroideae
B.K.Nayar
Genera

See text.

Taxonomy

The taxonomy of the subfamily Microsoroideae has been described as "highly problematic".[3] 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:[1]

A molecular phylogenetic study in 2019 suggested the following relationship between the PPG I genera (Thylacopteris was not included in the study):[3]

Microsoroideae
 
 
 
 
 

Lemmaphyllum

 
 

Lepidomicrosorium + Neocheiropteris + Neolepisorus + Tricholepidium 

 
 
 
 

Lepisorus s.s.

 
 

Paragramma (as Lepisorus longifolius)

 
 
 
 
 

Microsorum

 
 

Leptochilus

 
 
 
 
 

Bosmania

 
 
 

Dendroconche

 
 
 

Zealandia

 
 

Lecanopteris

 
 
 
 
 
 

Goniophlebium

 
 
Lepisorus s.l.
Lecanopteris s.l.

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.[3]

As of February 2020, 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.[4][5]

Alternative treatments of Lepisorus s.l.
PPG ICFLWPoWO
LemmaphyllumLemmaphyllumLemmaphyllum
NeocheiropterisNeocheiropterisNeocheiropteris
NeolepisorusNeolepisorus
TricholepidiumTricholepidiumTricholepidium
Lepidomicrosorium
LepisorusLepisorusLepisorus
ParagrammaParagramma
Alternative treatments of Lecanopteris s.l.
PPG ICFLWPoWO
syn. of MicrosorumDendroconchesyn. of Microsorum
Not recognizedBosmaniaNot recognized
Zealandia
LecanopterisLecanopterisLecanopteris

References
  1. PPG I (2016). "A community-derived classification for extant lycophytes and ferns". Journal of Systematics and Evolution. 54 (6): 563–603. doi:10.1111/jse.12229. S2CID 39980610.
  2. Christenhusz, Maarten J.M. & Chase, Mark W. (2014). "Trends and concepts in fern classification". Annals of Botany. 113 (9): 571–594. doi:10.1093/aob/mct299. PMC 3936591. PMID 24532607.CS1 maint: ref=harv (link)
  3. Testo, Weston L.; Field, Ashley R.; Sessa, Emily B. & Sundue, Michael (2019), "Phylogenetic and Morphological Analyses Support the Resurrection of Dendroconche and the Recognition of Two New Genera in Polypodiaceae Subfamily Microsoroideae" (PDF), Systematic Botany, 44 (4): 737–752, doi:10.1600/036364419X15650157948607, S2CID 208176686, retrieved 2020-02-11
  4. Hassler, Michael & Schmitt, Bernd (January 2020), Checklist of Ferns and Lycophytes of the World, Version 8.20, retrieved 2020-02-11
  5. Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2020-02-11


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