Pentagramma

Pentagramma is a small genus of North American ferns. Until 1990 members of this genus were included in Pityrogramma, and there has been considerable disagreement regarding the species' taxonomy.[1] In the most recent treatment, six diploid species are recognized.[2]

Pentagramma
Pentagramma triangularis
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Division: Polypodiophyta
Class: Polypodiopsida
Order: Polypodiales
Family: Pteridaceae
Subfamily: Cheilanthoideae
Genus: Pentagramma
Yatsk., Windham & E.Wollenw.
Species

See text.

The distribution of P. triangularis (goldback fern) extends from British Columbia through the western United States into Baja California in northwestern Mexico.[3] Pentagramma maxonii occurs in New Mexico, Arizona, Sonora, Baja California Sur, California, and Baja California. All other species are restricted to Californian and Baja California.

Members of the Pentagramma genus produce a powdery-waxy secretion on their lower leaf surfaces, called farina. This character is shared with the related Notholaena genus.

Species

As of December 2021, the Checklist of Ferns and Lycophytes of the World recognized the following species:[4]

  • Pentagramma glanduloviscida Schuettp. & Windham
  • Pentagramma maxonii (Weath.) Schuettp. & Windham
  • Pentagramma pallida (Weath.) Yatsk., Windham & E. Wollenw.
  • Pentagramma rebmanii (Winner & M. G. Simpson) Schuettp. & Windham
  • Pentagramma triangularis (Kaulf.) Yatsk., Windham & E. Wollenw.
  • Pentagramma viscosa (Nutt. ex D. C. Eaton) Schuettp. & Windham

References
  1. Yatskievych, George; Windham, Michael D.; Wollenweber, Eckhard (1990). "A Reconsideration of the Genus Pityrogramma (Adiantaceae) in Western North America". American Fern Journal. 80 (1): 9–17. doi:10.2307/1547301. JSTOR 1547301.
  2. Schuettpelz, Eric; Pryer, Kathleen M.; Windham, Michael D. (2015-10-01). "A Unified Approach to Taxonomic Delimitation in the Fern Genus Pentagramma (Pteridaceae)". Systematic Botany. 40 (3): 629–644. doi:10.1600/036364415x689366. hdl:10161/10796. ISSN 0363-6445. S2CID 18266345.
  3. C.Michael Hogan, ed. 2010. ‘’Pentagramma triangularis’’ . Encyclopedia of Life.
  4. Hassler, Michael (5 December 2021), "Pentagramma", World Ferns. Synonymic Checklist and Distribution of Ferns and Lycophytes of the World, 12.8, retrieved 2021-12-30


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