Didymoglossum

Didymoglossum
Didymoglossum reptans
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Order:	Hymenophyllales
Family:	Hymenophyllaceae
Subfamily:	Trichomanoideae
Genus:	Didymoglossum Desv. [1]
Type species
Didymoglossum muscoides (Dw.) Desvaux 1827
Subgenera
Subg. Didymoglossum Subg. Microgonium
Synonyms
HemiphlebiumPresl 1843 LecaniumPresl 1843 non Reinwardt 1825 LecanolepisPichi-Sermolli 1973 MicrogoniumPresl 1843

Didymoglossum is a tropical genus of ferns in the family Hymenophyllaceae. It comprises more than 30 epilithic or low-epiphytic species under two subgenera. ^[2] The genus is accepted in the Pteridophyte Phylogeny Group classification of 2016 (PPG I), but not by some other sources which sink it into a broadly defined Trichomanes .

Taxonomy

The genus Didymoglossum was first described by Nicaise Auguste Desvaux in 1827. ^[1] Its status, like other genera in the subfamily Trichomanoideae, remains disputed. The Pteridophyte Phylogeny Group classification of 2016 (PPG I) accepts the genus, placing it in the subfamily Hymenophylloideae and saying that there are about 30 species. ^[3] As of October 2019 ^[update] , the Checklist of Ferns and Lycophytes of the World listed 55 species, ^[1] whereas Plants of the World Online sank the genus into Trichomanes . ^[4]

Phylogeny of Didymoglossum [5] [6]

(Microgonium) D. bimarginatum D. cuspidatum D. fulgens D. kirkii D. lenormandii D. mindorense D. rotundifolium D. chamaedrys D. erosum D. sublimbatum D. ballardianum D. benlii D. ekmanii D. godmanii D. kapplerianum (Didymoglossum) section D. membranaceum Lecanium D. barklyanum section D. hymenoides D. kraussii D. reptans D. hildebrandtii D. beaverianum D. liberiense D. tahitense D. beccarianum D. motleyi Pinnata section D. petersii D. gourlianum D. nummularium D. punctatum D. exiguum D. lorencei D. pinnatinervium D. angustifrons D. ovale Flabellata

Subgenus Didymoglossum

Subgenus DidymoglossumEbihara & K.Iwats. is mainly neotropical, with about 20 species, ^[2] which include:

• Didymoglossum angustifrons Fée 1866 
  (=)Trichomanes angustifrons(Fée) Wess. Boer
• Didymoglossum cordifolium Fée  
  (=)Trichomanes cordifolium(Fée) Alston
• Didymoglossum curtii (Rosenst.) Pic.Serm. 
  (=)Trichomanes curtiiRosenst.
• Didymoglossum exiguum (Bedd.) Copel. 
  (=)Trichomanes exiguum(Bedd.) Baker
  (=)Hymenophyllum exiguumBedd.
• Didymoglossum gourlianum (Grev. ex J.Sm.) Pic.Serm. 
  (=)Trichomanes gourlianumGrev. ex J.Sm.
• Didymoglossum hildebrandtii (Kuhn) Ebihara & Dubuisson 
  (=)Trichomanes hildebrandtiiKuhn
• Didymoglossum hymenoides (Hedw.) Copel. 
  (=)Hemiphlebium hymenoides(Hedw.) Prantl
  (=)Trichomanes hymenoidesHedw.
• Didymoglossum krausii (Hook.& Grev.) C.Presl 
  (=)Hemiphlebium krausii(Hook.& Grev.) Prantl
  (=)Trichomanes krausiiHook.& Grev.
• Didymoglossum liberiense (Copel.) Copel. 
  (=)Trichomanes liberienseCopel.
• Didymoglossum lineolatum Bosch 
  (=)Trichomanes lineolatum(Bosch) Hook.
• Didymoglossum lorencei (Tardieu) Ebihara & Dubuisson 
  (=)Trichomanes lorenceiTardieu
• Didymoglossum melanopus (Baker) Copel. 
  (=)Trichomanes melanopusBaker
• Didymoglossum membranaceum (L.) Vareschi 
  (=)Lecanolepis membranacea(L.) Pic.Serm.
  (=)Hemiphlebium membranaceum(L.) Prantl
  (=)Lecanium membranaceum(L.) C.Presl
  (=)Trichomanes membranaceumL.
• Didymoglossum motleyi (Bosch) Ebihara & K.Iwats. 
  (=)Trichomanes motleyiBosch
• Didymoglossum nummularium Bosch 
  (=)Trichomanes nummularium(Bosch) C.Chr.
• Didymoglossum ovale E.Fourn. 
  (=)Trichomanes ovale(E.Fourn.) Wess. Boer
• Didymoglossum petersii (A.Gray) Copel. 
  (=)Hemiphlebium petersii(A.Gray) Prantl
  (=)Microgonium petersii(A.Gray) Bosch
  (=)Trichomanes petersiiA.Gray
• Didymoglossum pinnatinervium (Jenman) Pic.Serm. 
  (=)Trichomanes pinnatinerviumJenman
• Didymoglossum punctatum (Poir.) Desv. 
  (=)Didymoglossum punctatum(Poir.) C. Presl (hom. illeg. superfl.)
  (=)Hemiphlebium punctatum(Poir.) Bosch
  (=)Trichomanes punctatumPoir.
• Didymoglossum pusillum (Sw.) Desv. 
• Didymoglossum reptans (Sw.) C.Presl 
• Didymoglossum rhipidophyllum (Sloss.) Pic.Serm. 
• Didymoglossum sublimbatum (Müll.Berol.) Ebihara & K.Iwats. 
  (=)Trichomanes sublimbatumMüll.Berol.
• Didymoglossum tahitense (Nadeaud) Ebihara & K.Iwats. 
  (=)Trichomanes tahitenseNadeaud

Subgenus Microgonium

Subgenus Microgonium(C.Presl) Ebihara & K.Iwats. is mainly paleotropical with more than 10 species, ^[2] which include:

• Didymoglossum cuspidatum (Willd.) Ebihara & Dubuisson 
  (=)Trichomanes cuspidatumWilld.
• Didymoglossum bimarginatum (Bosch) Ebihara & K. Iwats. 
  (=)Microgonium bimarginatumBosch
• Didymoglossum ekmanii (Wess. Boer) Ebihara & Dubuisson 
  (=)Trichomanes ekmaniiWess.Boer
• Didymoglossum godmanii (Hook.) Ebihara & Dubuisson 
  (=)Trichomanes godmaniiHook.
• Didymoglossum kapplerianum (Sturm) Ebihara & Dubuisson 
  (=)Trichomanes kapplerianumSturm in Martius
• Didymoglossum kirkii (Hook.) Ebihara & Dubuisson 
  (=)Trichomanes kirkiiHook. in Hook. & Baker
• Didymoglossum lenormandii (Bosch) Ebihara & Dubuisson 
  (=)Trichomanes lenormandiiBosch
• Didymoglossum mindorense (H.Christ) K. Iwats. 
  (=)Trichomanes mindorenseH.Christ
• Didymoglossum pygmaeum (C.Chr.) Ebihara & Dubuisson 
  (=)Trichomanes pygmaeumC.Chr.
• Didymoglossum sinuatum (Bonap.) Ebihara & Dubuisson 
  (=)Trichomanes sinuatumBonap.
• Didymoglossum wesselsboeri Ebihara & Dubuisson 
  (=)Trichomanes hookeriC. Presl
  (=)nonDidymoglossum hookeriC. Presl

References

1. Hassler, Michael & Schmitt, Bernd (August 2019). "Didymoglossum". Checklist of Ferns and Lycophytes of the World. 8.02. Archived from the original on 2017-09-02. Retrieved 2019-10-07.
2. Ebihara et al.: A Taxonomic Revision of Hymenophyllaceae Blumea - Biodiversity, Evolution and Biogeography of Plants, Volume 51, Number 2, July 2006 , pp. 221-280(60)
3. 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.
4. "Didymoglossum Desv". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2019-10-07.
5. Nitta, Joel H.; Schuettpelz, Eric; Ramírez-Barahona, Santiago; Iwasaki, Wataru; et al. (2022). "An Open and Continuously Updated Fern Tree of Life". Frontiers in Plant Science. 13: 909768. doi: 10.3389/fpls.2022.909768 . PMC   9449725 . PMID   36092417.
6. "Tree viewer: interactive visualization of FTOL". FTOL v1.7.0 (GenBank release 261). 2024. Retrieved 1 May 2025.