Intrafamilial Relationships of the Thelypteroid Ferns (Thelypteridaceae)

By Alan R. Smith, R. Cranfill. 2002

118 citations recorded by the source corpus.

Abstract Data from three chloroplast genes (rps4 + trnS spacer, + trnL spacer; 1350 base pairs) for 27 of the recognized segregates show the Thelypteridaceae to be monophyletic and sister to an unresolved alliance of blechnoid, athyrioid, onocleoid, and woodsioid ferns. The family comprises two primary lineages, one phegopteroid, the other thelypteroid (including cyclosoroid). The phegopteroid lineage (Macrothelypteris, Pseudophegopteris, and Phegopteris) includes those elements that are the most dissected, lack adaxial grooves on the frond axes, and are generally morphologically the most distinct elements within the family. Within the thelypteroid-cyclosoroid lineage, three predominantly north-temperate subgroups, including Thelypteris s.s., form a free-veined clade that is in turn sister to the rest of the family. All segregates possessing x=36 (Cyclosorus sensu Smith, with predominantly anastomosing veins) form a strongly supported clade. Those groups with dysploid base chromosome numbers (x=27, 29, 30, 31, 32, 33, 34, 35) form a series of smaller clades basal to Cyclosorus s.l. Although our sampling is not yet sufficient to favor one classification over another, recognition of an intermediate number of genera may be the most reasonable taxonomic course.

Subfields: Ecology, Evolution, Behavior and Systematics

View Paper: https://www.semanticscholar.org/paper/7b9d6f38d6bc7705256788cec62ffdad28740ec6

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In Ecology, Evolution, Behavior and Systematics

Citations in the corpus

Fern phylogeny inferred from 400 leptosporangiate species and three plastid genes (2007, result): “The relationships we uncover within this larger clade are generally in agreement with those found in the only other study to examine thelypteroid phylogeny (Smith & Cranfill, 2002).”
Molecular Studies of Representative Species in the Fern Genus Elaphoglossum (Dryopteridaceae) Based on cpDNA Sequences rbcL, trnL‐F, and rps4‐trnS (2004, background): “Primers for the rps4 and trnS were rps4-59 (Nadot et al. 1995), rps4-39r (Nadot et al. 1995), rps4-3r.f (59AGT TGT TAG TTG TTG AGT AT39), rps4-39r.ext (59TAG TTG TAG AAT ATT ACT C39), and trnS-r (Smith and Cranfill 2002).”
A linear sequence of extant families and genera of lycophytes and ferns (2011, background): “5 or more genera References: Smith (1986), Smith & Cranfill (2002), Yatabe et al. (2002).”
A classification for extant ferns (2006, unknown): “Amauropelta, Coryphopteris, Metathelypteris, Oreopteris, Parathelypteris, and Thelypteris s.s.) (see Holttum, 1971; Smith & Cranfill, 2002).”
A revised family-level classification for eupolypod II ferns (Polypodiidae: Polypodiales) (2012, background): “Within Thelypteridaceae, however, generic classifications vary widely, and only two molecular phylogenetic studies have included a substantial representation of the family (approximately 30 species each; Smith & Cranfill, 2002; Schuettpelz & Pryer, 2007).”
The tortoise and the hare II: relative utility of 21 noncoding chloroplast DNA sequences for phylogenetic analysis. (2005, methodology): “Subsequently, Smith and Cranfill (2002) used this region in intrafamilial reconstruction of the thelypteroid ferns, although it was combined with the rpS4 gene and the trnL-trnF spacer and comparative analyses among these regions were not discussed.”
A community‐derived classification for extant lycophytes and ferns (2016, background): “Monophyletic (Smith & Cranfill, 2002; Rothfels et al., 2012a; Almeida et al., 2016).”