Alan R. Smith

Publications236
h-index35
Citations7,660
Highly Influential Citations432
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A classification for extant ferns
TLDR
A revised classification for extant ferns is presented, with emphasis on ordinal and familial ranks, and a synopsis of included genera is provided, reflecting recently published phylogenetic hypotheses based on both morphological and molecular data.
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Phylogeny and evolution of ferns (monilophytes) with a focus on the early leptosporangiate divergences.
The phylogenetic structure of ferns (= monilophytes) is explored here, with a special focus on the early divergences among leptosporangiate lineages. Despite considerable progress in our…
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Horsetails and ferns are a monophyletic group and the closest living relatives to seed plants
TLDR
It is shown that there are three monophyletic groups of extant vascular plants: (1) lycophytes, (2) seed plants and (3) a clade including equisetophytes (horsetails, psilotophytes) and all eusporangiate and leptosporangiates ferns.
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Unraveling the phylogeny of polygrammoid ferns (Polypodiaceae and Grammitidaceae): exploring aspects of the diversification of epiphytic plants.
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The pteridophytes of Mexico
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Phylogenetic Relationships and Evolution of Extant Horsetails, Equisetum, Based on Chloroplast DNA Sequence Data (rbcL and trnL‐F)
TLDR
The Equisetum crown group appears to have diversified in the early Cenozoic, whereas theEquisetaceae total group is estimated to have a Paleozoic origin, in remarkable agreement with current interpretations of the fossil record.
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A community‐derived classification for extant lycophytes and ferns
TLDR
A modern, comprehensive classification for lycophytes and ferns, down to the genus level, utilizing a community‐based approach, that uses monophyly as the primary criterion for the recognition of taxa, but also aims to preserve existing taxa and circumscriptions that are both widely accepted and consistent with the understanding of pteridophyte phylogeny.
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Phylogeny and evolution of grammitid ferns (Grammitidaceae): a case of rampant morphological homoplasy
TLDR
The authors' data support a New World origin of Grammitidaceae, with Old World taxa generally being more evolutionarily derived and several clades are either primarily Neotropical or primarily Paleotropical but also have a few members distributed in the opposite hemisphere.
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Intrafamilial Relationships of the Thelypteroid Ferns (Thelypteridaceae)
TLDR
Data from three chloroplast genes 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, and recognition of an intermediate number of genera may be the most reasonable taxonomic course.
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Serpocaulon (Polypodiaceae), a new genus segregated from Polypodium
TLDR
The neotropical fern genus Serpocaulon (Polypodiaceae), segregated from Polypodium, is described and new combinations for the forty known species are made, and there appears to be no convenient infrageneric division of the species within SerpOCaulon.
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