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Pteris tremula (Polypodiopsida: Pteridaceae): A Naturalized Species inArgentina.?The cosmopolitan fern genus Pteris L. (subfamily Pteridoideae,Pteridaceae; PPG I, Journal of Systematics and Evolution 54:563?603. 2016), isone of the most diverse, including approximately 250 species that inhabittemperate, tropical, and subtropical regions of all continents from Australia,New Zealand, South Africa, and South America northward to Japan and NorthAmerica. The species grow from open slopes to dense forests and from acidsoils to limestone rock; about 60 taxa occur in the tropical Americas (Liao,Ding, Wu, Prado, and Gilbert, Flora of China 2?3:181?211. 2013., Chao,Rouhan, Amoroso, and Chiou, Annals of Botany 114:109?124. 2014). Somespecies, such as Pteris cretica L., P. longifolia L., P. multifida Poir., P. tremulaR. Br., and P. vittata L. are reported as invasive plants in many parts of theworld, being increasingly found in both, natural and urban areas in severalcountries possibly as a result of climate change and human migration. Somegrow so prolifically that they have been classified as invasive weeds (Wilkinsand Salter, Bulletin of the Royal Society of Chemistry:8?10. 2003, Robinson,Sheffield, and Sharpe, In Mehltreter, Walker, and Sharpe, Fern Ecology:255?322. 2010). Among them, Pteris cretica, P. multifida and P. vittata are speciesthat originated in Asia (China) or Europe and have been cited as naturalized inmany regions of America since the early 1970s (e.g., de la Sota, Coleccion´Cient´ıfica del Instituto Nacional de Tecnolog´ıa Agropecuaria 13:1?275. 1977;Prado and Windisch, Boletim do Instituto de Botanica Sa ? ?o Paulo 13:103?199.2000; Mazumdar and Arana, Phytotaxa 261:199?200. 2016). Pteris tremulabelongs to the Pteris chilensis clade, characterized by three to four-pinnatifidlamina, ultimate pinnules (lobes) with veins free (Zhang, Rothfels, Ebihara,Schuettpelz, Le Pechon, Kamau, He, Zhou, Prado, Field, Yatskievych, Gao, ´and Zhang, Cladistics 31:1?18. 2014). The clade contains only two specieswith disjunct distributions, the Chilean endemic Pteris chilensis Desv. andPteris tremula, known as ??tender brakefern?? and originally distributed in theAustralasian South Pacific, in Australia and Norfolk Island, Lord Howe Island,New Zealand, Kermadec Island, and Fiji (Kramer and Mc Carthy, Flora ofAustralia 48:242?248. 1998), often locally naturalized in the NorthernHemisphere (Zhang et al., 2014). Also, P. tremula has been cited as aninvasive weed in South Africa (Baard and Kraaij, South African Journal ofBotany 94:51?63. 2014).