''Mildella'' is a genus of

fern A fern (Polypodiopsida or Polypodiophyta ) is a member of a group of vascular plants (plants with xylem and phloem) that reproduce via spores and have neither seeds nor flowers. The polypodiophytes include all living pteridophytes except t ...

s in the subfamily

Cheilanthoideae Cheilanthoideae is one of the five subfamilies of the fern family Pteridaceae. The subfamily is thought to be monophyletic, but some of the genera into which it has been divided are not, and the taxonomic status of many of its genera and species ...

of the family

Pteridaceae Pteridaceae is a family of ferns in the order Polypodiales, including some 1150 known species in ca 45 genera (depending on taxonomic opinions), divided over five subfamilies. The family includes four groups of genera that are sometimes recogni ...

. Species are native to Mexico, Central America and the Caribbean.

Species

The

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

classification of 2016 (PPG I) placed seven species in the genus, although recognizing that the genus was then not

monophyletic In cladistics for a group of organisms, monophyly is the condition of being a clade—that is, a group of taxa composed only of a common ancestor (or more precisely an ancestral population) and all of its lineal descendants. Monophyletic gro ...

, since the

New New is an adjective referring to something recently made, discovered, or created. New or NEW may refer to: Music * New, singer of K-pop group The Boyz Albums and EPs * ''New'' (album), by Paul McCartney, 2013 * ''New'' (EP), by Regurgitator, ...

and

Old World The "Old World" is a term for Afro-Eurasia that originated in Europe , after Europeans became aware of the existence of the Americas. It is used to contrast the continents of Africa, Europe, and Asia, which were previously thought of by the ...

species belonged in different

clade A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, ...

s. , the ''Checklist of Ferns and Lycophytes of the World'' placed only two New World species in the genus: *''

Mildella fallax ''Mildella'' is a genus of ferns in the subfamily Cheilanthoideae of the family Pteridaceae. Species are native to Mexico, Central America and the Caribbean. Species The Pteridophyte Phylogeny Group classification of 2016 (PPG I) placed seven sp ...

'' (M.Martens & Galeotti) G.L.Nesom *'' Mildella intramarginalis'' (Kaulf. ex Link) Trevis. The ''Checklist of Ferns and Lycophytes of the World'' placed former ''Mildella'' species in the genus '' Oeosporangium'': *''Mildella henryi'' (Christ) C.C.Hall & Lellinger = '' Oeosporangium nitidulum'' *''Mildella mairei'' (Brause) C.C.Hall & Lellinger = '' Oeosporangium mairei'' *''Mildella nitidula'' (Wall. ex Hook.) C.C. Hall & Lellinger = '' Oeosporangium nitidulum'' *''Mildella paupercula'' (Christ) C.C.Hall & Lellinger = '' Oeosporangium pauperculum'' *''Mildella smithii'' (C.Chr.) C.C.Hall & Lellinger = '' Oeosporangium smithii'' *''Mildella straminea'' (Ching) C.C.Hall & Lellinger = '' Oeosporangium stramineum''

References

Pteridaceae Fern genera Taxa named by Vittore Benedetto Antonio Trevisan de Saint-Léon {{Pteridaceae-stub