Schizaeaceae

Schizaeaceae
Schizaea cf. bifida from Waratah Track, Ku-ring-gai Chase National Park, Australia
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Order:	Schizaeales
Family:	Schizaeaceae Kaulf.
Genera [1]
See text

Schizaeaceae is a family of ferns in the order Schizaeales. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), it includes only two genera. ^[1] Alternatively, two families kept separate in PPG I, Lygodiaceae and Anemiaceae, may be included in Schizaeaceae (as the subfamilies Lygodioideae and Anemioideae) ^[2] so that the family has four genera. ^{[3] [4]} In this approach, the Schizaeaceae of PPG I is treated as the subfamily Schizaeoideae. ^[2]

Distribution

Species are mainly distributed in the tropics, but several are found in temperate regions in North America, South Africa, Australasia and Northeast Asia. ^{[5] [6]}

Description

The sporangia are borne on specialised pinnae, distinct from ordinary vegetative pinnae. The pinnae form small comb-like, pinnate structures on which the sporangia are formed.^{[ citation needed ]}

Genera

In the narrow circumscription of the family, there are two genera: ^[1]

• Actinostachys Wall
• Schizaea Sm.

Two further genera are included in the broader circumscription: ^[3]

• Anemia Sm. – otherwise placed in the monotypic family Anemiaceae
• Lygodium Sw. – otherwise placed in the monotypic family Lygodiaceae

Extinct Genera

• Ruffordia ^[7]

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 . S2CID   39980610.
2. Christenhusz, Maarten J.M. & Chase, Mark W. (2014). "Trends and concepts in fern classification". Annals of Botany. 113 (9): 571–594. doi:10.1093/aob/mct299. PMC   3936591 . PMID   24532607.
3. "Schizaeaceae Kaulf". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2019-11-24.
4. Christenhusz, M. J. M. & Byng, J. W. (2016). "The number of known plants species in the world and its annual increase". Phytotaxa. 261 (3). Magnolia Press: 201–217. doi: 10.11646/phytotaxa.261.3.1 .
5. "Actinostachys Wall". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2019-08-08.
6. "Schizaea Sm". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2019-08-08.
7. Dettmann, Mary E.; Clifford, H. Trevor (1992-01-01). "Phylogeny and biogeography of Ruffordia, Mohria and Anemia (Schizaeaceae) and Ceratopteris (Pteridaceae): evidence from in situ and dispersed spores". Alcheringa: An Australasian Journal of Palaeontology. 16 (4): 269–314. doi:10.1080/03115519208619111. ISSN   0311-5518.