Leucotrichum

Leucotrichum is a genus of ferns in the family Polypodiaceae, subfamily Grammitidoideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I).[1] It is one of about 26 genera of "grammitids".[2] The name of the genus refers to the white hairs that are usually present on the underside of the frond.[3]

Leucotrichum
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Class: Polypodiopsida
Order: Polypodiales
Suborder: Polypodiineae
Family: Polypodiaceae
Subfamily: Grammitidoideae
Genus: Leucotrichum
Labiak[1]
Type species
Leucotrichum organense
(Gardner) Labiak
Species

See text.

Taxonomy

Leucotrichum was established in 2010 and has about six currently recognized species. The type species for the genus is Leucotrichum organense.[3] Four of the species had been in Lellingeria, and one, Leucotrichum mortonii, had been in the defunct genus Xiphopteris.

In 2004, a phylogenetic study of DNA sequences of grammitids showed that a few species of Lellingeria are not closely related to the others.[4] They are sister to a clade of 26 species which at that time were in the genus Terpsichore. This was confirmed six years later in another molecular phylogenetic study on the grammitids.[2] In 2010, four species from Lellingeria and one from Xiphopteris were transferred to the new genus Leucotrichum.[3] The clade of 26 species that is sister to Leucotrichum was named as a new genus, Alansmia, in 2011.[5]

Species

As of February 2020, the Checklist of Ferns and Lycophytes of the World accepted the following species:[6]

  • Leucotrichum madagascariense Rakotondr. & Rouhan
  • Leucotrichum mitchelliae (Baker) Labiak
  • Leucotrichum mortonii (Copel.) Labiak
  • Leucotrichum organense (Gardner) Labiak
  • Leucotrichum pseudomitchelliae (Lellinger) Labiak
  • Leucotrichum schenckii (Hieron.) Labiak

Distribution

Leucotrichum has a disjunct distribution. Leucotrichum organense and Leucotrichum schenckii are endemic to the Atlantic moist forests of coastal southeastern Brazil. Leucotrichum mortonii is known only from Cuba and the Dominican Republic. Leucotrichum pseudomitchellae occurs in Costa Rica and Panama. Leucotrichum mitchellae ranges through Mexico, Central America, and the Caribbean.[3] Leucotrichum madagascariense occurs in Madagascar.

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.
  2. Michael A. Sundue, Melissa B. Islam, and Tom A. Ranker. 2010. "Systematics of Grammitid Ferns (Polypodiaceae): Using Morphology and Plastid Sequence Data to Resolve the Circumscriptions of Melpomene and the Polyphyletic Genera Lellingeria and Terpsichore" Systematic Botany 35(4):701-715(15). doi:10.1600/036364410X539790 (See External links below).
  3. Paulo H. Labiak, Germinal Rouhan, and Michael A. Sundue. 2010. "Phylogeny and taxonomy of Leucotrichum (Polypodiaceae): A new genus of grammitid ferns from the Neotropics". Taxon 59(3):911-921.
  4. Tom A. Ranker, Alan R. Smith, Barbara S. Parris, Jennifer M.O. Geiger, Christopher H. Haufler, Shannon C.K. Straub, and Harald Schneider. 2004. "Phylogeny and evolution of grammitid ferns (Grammitidaceae): a case of rampant morphological homoplasy". Taxon 53(2):415-428.
  5. Michael Kessler, Ana Laura Moguel Velázquez, Michael A. Sundue and Paulo H. Labiak. 2011. "Alansmia, a new genus of grammitid ferns (Polypodiaceae) segregated from Terpsichore. Brittonia 63(2):233-244. doi:10.1007/s12228-010-9156-y
  6. Hassler, Michael & Schmitt, Bernd (January 2020). "Leucotrichum". Checklist of Ferns and Lycophytes of the World. Version 8.20. Retrieved 2020-02-22.
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