Blechnaceae

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Blechnaceae
Blechnum spicant2.jpg
Struthiopteris spicant
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Division: Polypodiophyta
Class: Polypodiopsida
Order: Polypodiales
Suborder: Aspleniineae
Family: Blechnaceae
Newman [1]
Type genus
Blechnum
Subfamilies and genera

See text.

Synonyms [2]
  • Stenochlaenaceae Ching 1978
Blechnopsis orientalis. The young opening fronds of many species are usually tinged with red. Ni Wu Mao Jue - Xi Tou Zi Ran Jiao Yu Yuan Qu Blechnopsis orientalis - Xitou Nature Education Area, Taiwan 20220628191131 08.jpg
Blechnopsis orientalis . The young opening fronds of many species are usually tinged with red.

Blechnaceae is a family of ferns in the order Polypodiales, with a cosmopolitan distribution. Its status as a family and the number of genera included have both varied considerably. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), the family has 24 genera, and excludes genera placed in the separate family Onocleaceae. The family is divided into three subfamilies, including Blechnoideae s.s. [1] Alternatively, the entire family may be treated as the subfamily Blechnoideae s.l. of a very broadly defined family Aspleniaceae, and include genera others place in Onocleaceae. [2]

Contents

Description

Most are ground dwelling, some are climbers, such as Stenochlaena . A characteristic feature of many species is that the young opening fronds are usually tinged with red.

Taxonomy

The family was created by Newman in 1844. In 2014, Christenhusz and Chase submerged it as subfamily Blechnoideae within the family Aspleniaceae and included Onocleaceae in it. [2] The PPG I classification of 2016 restored it to family status. [1]

Blechnaceae is a member of the eupolypods II clade (now the suborder Aspleniineae), in the order Polypodiales. [3] It is related to other families in the clade as in the following cladogram: [4] [3]

Aspleniineae  (eupolypods II)

Subdivisions

The number of genera accepted within Blechnaceae (or Blechnoideae when treated as a subfamily) has varied between authors. Christenhusz and Chase (2014), treating the group as a subfamily, describe the situation as follows: "Blechnoideae comprise three major clades, one corresponding to Onoclea sensu lato, a second corresponding to Woodwardia , sister to all other species that can be treated as the single genus Blechnum . However, the subclade sister to the rest of Blechnumsensu lato contains the vining taxa Stenochlaena, Salpichlaena J.Sm. and a few non-vining Blechnum species with long-creeping rhizomes, which may have to be accepted at the generic level pending further studies. Brainea , Doodia , Pteridoblechnum and Sadleria belong to Blechnum sensu lato." [2]

Perrie et al. (2014) retained the family rank and excluded Onoclea as a separate family, Onocleaceae, sister to Blechnaceae. They identified three major clades within the remaining Blechnaceae, which they labelled Woodwardia, super-Stenochlaena and super-Blechnum, with the latter two as sister groups. They did not consider Blechnum as monophyletic and recommended revision of intergeneric boundaries, resulting in seven genera. [5]

Gasper et al. (2016), independently of Christenhusz and Chase, examined the deeper relationships of the Blechnaceae, retaining its family status and excluding Onocleaceae, and allocated the three major clades of Perrie et al. (2014) to subfamilies: Woodwardioideae, Stenochlaenoideae and Blechnoideae. Their approach to the polyphyletic nature of Blechnum was to create a series of monophyletic segregate genera, resulting in 24 genera in total. [6] [7] The relationship between the three subfamilies was found to be as follows: [6]

Blechnaceae

Woodwardioideae

Stenochlaenoideae

Blechnoideae

The approximate relationship between some of the taxa used in the classifications of Christenhusz and Chase (2014) [2] and PPG I (2016) [1] is shown in the table below.

Approximate relationships in two classifications
Christenhusz & Chase (2014)PPG I (2016)
Family Aspleniaceae
Subfamily Blechnoideae
Genus Blechnum s.l.
 
Suborder Aspleniineae
Family Blechnaceae
Subfamily Blechnoideae
(containing Blechnum s.s.)

Subfamilies and genera

Phylogeny of Blechnaceae [8] [9]

In 2016, the Pteridophyte Phylogeny Group followed Gasper et al. (2016) in accepting 24 genera, grouped into three subfamilies with approximately 265 species, most of which are placed in the subfamily Blechnoideae. [1]

Subfamily Woodwardioideae Gasper, V.A.O.Dittrich & Salino

Subfamily Stenochlaenoideae (Ching) J.P.Roux

Subfamily Blechnoideae Gasper, V.A.O.Dittrich & Salino

Subfamily incertae sedis

Related Research Articles

<i>Lomaria</i> Genus of ferns

Lomaria is a genus of ferns belonging to the family Blechnaceae.

<i>Blechnum</i> Genus of ferns in the family Blechnaceae

Blechnum, known as hard fern, is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, according to the Pteridophyte Phylogeny Group classification of 2016. Two very different circumscriptions of the genus are used by different authors. In the PPG I system, based on Gasper et al. (2016), Blechnum is one of 18 genera in the subfamily Blechnoideae, and has about 30 species. Other sources use a very broadly defined Blechnum s.l., including accepting only two other genera in the subfamily. The genus then has about 250 species. In the PPG I circumscription, the genus is mostly neotropical, with a few southern African species.

<i>Struthiopteris spicant</i> Species of fern in the family Blechnaceae

Struthiopteris spicant, syn. Blechnum spicant, is a species of fern in the family Blechnaceae, known by the common names hard-fern or deer fern. It is native to Europe, western Asia, northern Africa, and western North America. Like some other species in the family Blechnaceae, it has two types of leaves. The sterile leaves have flat, wavy-margined leaflets 5 to 8 millimeters wide, while the fertile leaves have much narrower leaflets, each with two thick rows of sori on the underside.

<i>Neoblechnum</i> Genus of ferns

Neoblechnum is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, with a single species Neoblechnum brasiliense, according to the Pteridophyte Phylogeny Group classification of 2016. The genus is accepted in a 2016 classification of the family Blechnaceae, but other sources sink it into a very broadly defined Blechnum, equivalent to the whole of the PPG I subfamily; the species is then known as Blechnum brasiliense. It is called Brazilian dwarf tree fern, red Brazilian tree fern, and red dwarf tree fern.

<i>Struthiopteris</i> Genus of ferns

Struthiopteris is a genus of ferns belonging to the family Blechnaceae, subfamily Blechnoideae.

The Pteridophyte Phylogeny Group (PPG) is an informal international group of systematic botanists who collaborate to establish on the classification of pteridophytes that reflects knowledge about plant relationships discovered through phylogenetic studies. In 2016, the group published a classification for extant pteridophytes, termed "PPG I". The paper had 94 authors . The classification was presented as a consensus classification supported by the community of fern taxonomists, but it has been partially exclusive and is highly contested. Alternative classifications of ferns exist and are preferred by more general taxonomists.

<i>Austroblechnum</i> Genus of ferns

Austroblechnum is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, according to the Pteridophyte Phylogeny Group classification of 2016. The genus is accepted in a 2016 classification of the family Blechnaceae, but other sources sink it into a very broadly defined Blechnum, equivalent to the whole of the PPG I subfamily.

<i>Blechnopsis</i> Genus of ferns

Blechnopsis is a small genus of ferns in the family Blechnaceae, subfamily Blechnoideae, according to the Pteridophyte Phylogeny Group classification of 2016. The genus is accepted in a 2016 classification of the family Blechnaceae, but other sources sink it into a very broadly defined Blechnum, equivalent to the whole of the PPG I subfamily.

<i>Cranfillia</i> Genus of ferns

Cranfillia is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, according to the Pteridophyte Phylogeny Group classification of 2016. The genus is accepted in a 2016 classification of the family Blechnaceae, but other sources sink it into a very broadly defined Blechnum, equivalent to the whole of the PPG I subfamily.

<i>Diploblechnum</i> Genus of ferns

Diploblechnum is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, according to the Pteridophyte Phylogeny Group classification of 2016. The genus is accepted in a 2016 classification of the family Blechnaceae, but other sources sink it into a very broadly defined Blechnum, equivalent to the whole of the PPG I subfamily.

<i>Lomaridium</i> Genus of ferns

Lomaridium is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, according to the Pteridophyte Phylogeny Group classification of 2016. The genus is accepted in a 2016 classification of the family Blechnaceae, but other sources sink it into a very broadly defined Blechnum, equivalent to the whole of the PPG I subfamily.

<i>Lomariocycas</i> Genus of ferns

Lomariocycas is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, according to the Pteridophyte Phylogeny Group classification of 2016. The genus is accepted in a 2016 classification of the family Blechnaceae, but other sources sink it into a very broadly defined Blechnum, equivalent to the whole of the PPG I subfamily.

<i>Oceaniopteris</i> Genus of ferns

Oceaniopteris is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, according to the Pteridophyte Phylogeny Group classification of 2016. The genus is accepted in a 2016 classification of the family Blechnaceae, but other sources sink it into a very broadly defined Blechnum, equivalent to the whole of the PPG I subfamily.

<i>Parablechnum</i> Genus of ferns

Parablechnum is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, according to the Pteridophyte Phylogeny Group classification of 2016. The genus is accepted in a 2016 classification of the family Blechnaceae, but other sources sink it into a very broadly defined Blechnum, equivalent to the whole of the PPG I subfamily.

Blechnidium is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, with a single species Blechnidium melanopus, according to the Pteridophyte Phylogeny Group classification of 2016. The genus is accepted in a 2016 classification of the family Blechnaceae, but other sources sink it into a very broadly defined Blechnum, equivalent to the whole of the PPG I subfamily.

<i>Brainea</i> Genus of ferns

Brainea is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, with a single species Brainea insignis, according to the Pteridophyte Phylogeny Group classification of 2016. The genus is accepted in a 2016 classification of the family Blechnaceae, but other sources sink it into a very broadly defined Blechnum, equivalent to the whole of the PPG I subfamily.

Cleistoblechnum is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, with a single species Cleistoblechnum eburneum, according to the Pteridophyte Phylogeny Group classification of 2016. The genus is accepted in a 2016 classification of the family Blechnaceae, but other sources sink it into a very broadly defined Blechnum, equivalent to the whole of the PPG I subfamily.

<i>Icarus filiformis</i> Species of fern

Icarus is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, with a single species Icarus filiformis, according to the Pteridophyte Phylogeny Group classification of 2016. The genus is accepted in a 2016 classification of the family Blechnaceae, but other sources sink it into a very broadly defined Blechnum, equivalent to the whole of the PPG I subfamily.

References

  1. 1 2 3 4 5 PPG I 2016.
  2. 1 2 3 4 5 Christenhusz & Chase 2014.
  3. 1 2 Carl J. Rothfels; Anders Larsson; Li-Yaung Kuo; Petra Korall; Wen- Liang Chiou; Kathleen M. Pryer (2012). "Overcoming Deep Roots, Fast Rates, and Short Internodes to Resolve the Ancient Rapid Radiation of Eupolypod II Ferns". Systematic Biology. 61 (1): 490–509. doi: 10.1093/sysbio/sys001 . PMID   22223449.
  4. ↑ Samuli Lehtonen (2011). Steinke, Dirk (ed.). "Towards Resolving the Complete Fern Tree of Life". PLOS ONE. 6 (10): e24851. Bibcode:2011PLoSO...624851L. doi: 10.1371/journal.pone.0024851 . PMC   3192703 . PMID   22022365.
  5. ↑ Perrie et al. 2014.
  6. 1 2 Gasper et al. 2016a.
  7. ↑ Gasper et al. 2016b.
  8. ↑ 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.
  9. ↑ "Tree viewer: interactive visualization of FTOL". FTOL v1.3.0. 2022. Retrieved 12 December 2022.
  10. ↑ Smith, S. Y.; Stockey, R. A.; Nishida, H.; Rothwell, G. W. (2006). "Trawetsia princetonensis gen. et sp. nov.(Blechnaceae): a permineralized fern from the Middle Eocene Princeton Chert". International Journal of Plant Sciences. 167 (3): 711–719. doi:10.1086/501034. S2CID   85160532.

Bibliography

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