Saccoloma Explained

Saccoloma is a fern genus in family Saccolomataceae.^[1] It is the only genus in the family in the Pteridophyte Phylogeny Group classification of 2016 (PPG I), but further investigation is needed. It is pantropical and its species are found in wet, shaded forest areas.^[2] Saccoloma species are characterized by an omega-shaped (Ω) vascular bundle in the cross-sections of their petioles.^{[3] [4]} The common name soralpouch fern is used for Saccoloma.

Phylogeny

Saccoloma includes Orthiopteris in the Pteridophyte Phylogeny Group classification of 2016 (PPG I), with a total of 18 species., Plants of the World Online accepts the following species (which may be based on a wider circumscription of the genus). Synonyms are taken from the Checklist of Ferns and Lycophytes of the World.

Phylogeny of Saccoloma^{[5] [6]}

Other species include:

• Saccoloma acuminatum (Rosenst.) Christenh. (syn. Orthiopteris acuminata (Rosenst.) Copel.)
• Saccoloma cicutarioides (Baker) Christenh. (syn. Orthiopteris cicutarioides (Baker) Copel.)
• Saccoloma firmum (Kuhn) C.Chr. (syn. Orthiopteris firma (Kuhn) Brownlie)
• Saccoloma henriettae (Baker) C.Chr. (syn. Orthiopteris henriettae (Baker) Copel.)
• Saccoloma laxum R.C.Moran & B.Øllg.
• Saccoloma membranaceum Mickel
• Saccoloma moranii A.Rojas
• Saccoloma quadripinnatum A.Rojas
• Saccoloma samoense (Hovenkamp & T.T.Luong) Christenh. (syn. Orthiopteris samoensis Hovenk. & T. T. Luong)
• Saccoloma squamosum R.C.Moran
• Saccoloma tenue (Brack.) Mett. (syn. Orthiopteris tenuis (Brack.) Brownlie)
• Saccoloma trichophyllum (Copel.) G.B.Nair (syn. Orthiopteris trichophylla Copel.)

Notes and References

1. http://www.mapress.com/phytotaxa/content/2011/f/pt00019p054.pdf Christenhusz et al. "A linear sequence of extant families and genera of lycophytes and ferns"
2. http://www.metodosenecologiaysistematica.org/vol5/vol5%281%29/saccoloma5%281%29.pdf Rojas-Alvarado "Novelties in the Saccoloma inaequale complex (Saccolomataceae) from the neotropics"
3. http://www.plantsystematics.org/imgs/robbin/r/Dennstaedtiaceae_Saccoloma_moranii_28675.html Saccoloma inaequale petiole
4. http://www.plantsystematics.org/imgs/robbin/r/Dennstaedtiaceae_Saccoloma_dominguensis_39778.html Saccoloma dominguense petiole
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. 10.3389/fpls.2022.909768 . 36092417. 9449725. free.
6. Web site: et al. . 2023 . Tree viewer: interactive visualization of FTOL . FTOL v1.5.0 [GenBank release 256] . 17 August 2023.