Mickelia

Mickelia is a genus of ferns in the family Dryopteridaceae, subfamily Elaphoglossoideae, in the Pteridophyte Phylogeny Group classification of 2016 (PPG I).[2] It is one of the six genera of bolbitidoid ferns and is sister to the very large genus Elaphoglossum.[3] It consists of about 10 species.[1][4] All are native to the neotropics.

Mickelia
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Class: Polypodiopsida
Order: Polypodiales
Suborder: Polypodiineae
Family: Dryopteridaceae
Subfamily: Elaphoglossoideae
Genus: Mickelia
R.C.Moran, Labiak, & Sundue[1]
Type species
Mickelia nicotianifolia
(Olof Swartz) R.C.Moran, Labiak, & Sundue
Species

See text.

Description

Hemiepiphytic or terrestrial ferns. Rhizomes dorsiventral, the ventral meristele elongate in cross section. Phyllopodia absent. Leaves articulate at base or continuous with the rhizome, dimorphic as sporophylls and trophophylls, the sporophylls having longer petioles and smaller pinnae. Fronds never differentiated into bathyphylls and acrophylls as in the bolbitidoid genera Lomagramma, Arthrobotrya, and Teratophyllum. Fronds singly pinnate or bipinnate with a single, free, basal segment on each of the basal pinnae. Pinnae articulate or continuous with the rachis; terminal pinna conform (similar in size and shape to the lateral pinnae). Veins variously anastomosing (not free); veinlets usually included in the areoles. Sori acrostichoid (covering the entire abaxial surface of the leaf); Paraphyses absent. Spores monolete.

Comparative anatomy

No single character is known to distinguish Mickelia from Bolbitis, but the rhizomes of five species of Mickelia have been examined and found to have ground tissue that is greenish, instead of the whitish color found in most ferns. The greenish rhizome ground tissue might be a synapomorphy for Mickelia. Seven species of Mickelia are hemiepiphytes, whereas all of the Bolbitis species are terrestrial. The location of vegetative buds, when present, is different in the two genera.

Taxonomy

The genus Mickelia was erected in 2010, following a molecular phylogenetic study of the bolbitidoid ferns, based on DNA sequences of the chloroplast intergenic spacers trnL-F and rps4-trnS.[3] Mickelia was named for the American pteridologist John Thomas Mickel, who contributed much regarding Elaphoglossum, the closest relative of Mickelia.

Six species of Mickelia had previously been in the genus Bolbitis. Mickelia pradoi and Mickelia furcata were first described in the paper that established Mickelia.[4] Mickelia scandens was resurrected from Mickelia guianensis, which had previously been in Lomagramma because of its venation pattern. These two had been treated as a single species since the time when they were both in the genus Acrostichum. For this reason, the most recent species name that had been applied to Mickelia scandens was Acrostichum scandens.[4]

The species that had been in Bolbitis were described in a monograph of that genus in 1977.[5] The mesoamerican species of Bolbitis were given an updated treatment in 1995[6] and detailed biogeographic information for these was published in 2004.[7] Mickelia was first described in a synopsis of the genus that did not repeat much of the information published in previous works.

Phylogeny

The phylogenetic tree below is based on one that was published in 2010.[3] The positions of Mickelia pradoi and Mickelia lindigii are based on morphology only. Mickelia furcata and Mickelia pergamentacea are omitted because they have not been sampled for DNA and morphology does not clearly indicate their affinities. Mickelia furcata is known from only one specimen collected in 1985 and lacking fertile fronds.[4]

Mickelia 
 
 

Mickelia guianensis

 
 
 

Mickelia scandens

 
 

Mickelia pradoi

 
 
 
 
 
 

Mickelia bernoullii

 
 

Mickelia lindigii

 
 
 
 

Mickelia nicotianifolia

 
 
 

Mickelia hemiotis

 
 

Mickelia oligarchica

 
 
 
 
 

Species

As of January 2020, the Checklist of Ferns and Lycophytes of the World accepted the following species and one hybrid:[1]

  • Mickelia × atrans R.C.Moran, Labiak & Sundue
  • Mickelia bernoullii (Kuhn ex Christ) R.C.Moran, Labiak & Sundue
  • Mickelia furcata R.C.Moran, Labiak & Sundue
  • Mickelia guianensis (Aubl.) R.C.Moran, Labiak & Sundue
  • Mickelia hemiotis (Maxon) R.C.Moran, Labiak & Sundue
  • Mickelia lindigii (Mett.) R.C.Moran, Labiak & Sundue
  • Mickelia nicotianifolia (Sw.) R.C.Moran, Labiak & Sundue
  • Mickelia oligarchica (Baker) R.C.Moran, Labiak & Sundue
  • Mickelia pergamentacea (Maxon) R.C.Moran, Labiak & Sundue
  • Mickelia pradoi R.C.Moran, Labiak & Sundue
  • Mickelia scandens (Raddi) R.C.Moran, Labiak & Sundue

References
  1. Hassler, Michael & Schmitt, Bernd (January 2020). "Mickelia". Checklist of Ferns and Lycophytes of the World. 8.20. Retrieved 2020-01-21.
  2. 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.
  3. Robbin C. Moran, Paulo H. Labiak, and Michael Sundue. 2010. "Phylogeny and character evolution of the bolbitidoid ferns (Dryopteridaceae)". International Journal of Plant Sciences 171(5):547-559. doi:10.1086/652191
  4. Robbin C. Moran, Paulo H. Labiak, and Michael Sundue. 2010. "Synopsis of Mickelia, a newly recognized genus of bolbitidoid ferns (Dryopteridaceae)". Brittonia 62(4):337-356.
  5. Elbert Hennipman. 1977. "A monograph of the fern genus Bolbitis (Lomariopsidaceae)". Leiden Botanical Series 12:1-331.
  6. Elbert Hennipman and Robbin C. Moran. 1995. "Bolbitis". pages 247-250. In: Gerrit Davidse, Mario Sousa, and Sandra D. Knapp (editors). Flora Mesoamericana, volumen 1, Psilotaceae a Salviniaceae. Universidad Nacional Autónoma de México. Ciudad Universitaria. (See External links below).
  7. John T. Mickel and Alan R. Smith. 2004. The Pteridophytes of Mexico. The New York Botanical Garden Press: NY, USA. ISBN 978-0-89327-488-7
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