Taxonomic notes on Asplenium pseudoangustum (Aspleniaceae): a redescription based on spore morphology and distribution novelties

Abstract Asplenium pseudoangustum is a poorly understood species known from the Peruvian Amazon forests. Due to morphological similarities with A. angustum and A. serratum, the position of A. pseudoangustum among the called A. serratum complex was suggested. However, spore ornamentation and scales morphology indicate that A. pseudoangustum is more related to the species of the A. hastatum subclade. Here, we present a redescription for this species, including scales and spore morphology, and an updated distribution including records from Brazil and Colombia

ADIANTUM (PTERIDACEAE) no arboreto do Jardim Botânico do Rio de Janeiro, Brasil

RESUMO Apresenta-se o estudo das espécies do gênero Adiantum que ocorrem espontaneamente ou são cultivadas no Jardim Botânico do Rio de Janeiro. Foram encontradas 13 espécies e um cultivar. Verificou-se que 12 espécies são nativas do neotrópico, sendo uma endêmica do Brasil (Adiantum pentadactylon) e duas espécies são provenientes do Paleotrópico (A. caudatum e A. formosum). São apresentadas chave de identificação, descrições, ilustrações e comentários sobre as espécies estudadas

Schizaeales no Parque Estadual do Itacolomi, Minas Gerais, Brasil

Esse trabalho consiste no estudo taxonômico das Schizaeales no Parque Estadual do Itacolomi, localizado nos municípios de Ouro Preto e Mariana, Estado de Minas Gerais, Brasil. O Parque é constituído principalmente por campos rupestres e fl orestas estacionais semideciduais. A ordem Schizaeales ocorre essencialmente em ambientes tropicais e temperado meridional, sendo constituída por três famílias: Schizaeaceae, Anemiaceae e Lygodiaceae. Foram encontrados 14 táxons, distribuídos em três gêneros: Anemia (11 espécies, com reconhecimento de três variedades), Lygodium (uma espécie), Schizaea (uma espécie). Do total de táxons estudados, seis são endêmicos do Brasil. São apresentadas chaves de identifi cação, descrições, ilustrações e comentários. ____________________________________________________________________________________ABSTRACT: This work presents the taxonomic study of Schizaeales from Itacolomi State Park, located in Ouro Preto and Mariana Municipalities, Minas Gerais State, Brazil. The vegetation of the Park is mostly formed by campos rupestres and semideciduous forests. The Schizaeales is found primarily in tropics and southern temperate zones, consisting of three families: Schizaeaceae, Anemiaceae and Lygodiaceae. Fourteen taxons were found: Anemia (11 species, including three varieties), Lygodium (one species), Schizaea (one species). Six taxons were recognized as endemics to Brazil. Identifi cation keys, descriptions, illustrations and comments are presented

Life history of an endemic and threatened species: Pteris congesta

Abstract Pteris congesta an endemic and endangered species was investigated to identify morphological differences between its sterile and fertile leaves. Our findings have unveiled, leaf dimorphism in both morphology and growth patterns between fertile and sterile leaves. The sterile leaves petioles exhibited equivalent growth to the laminae, achieving complete leaf expansion within a month. In contrast, the petioles of fertile leaves elongated more than twice the size of the leaf blades that remain closed for the initial 30 days. Spore germination was carried out in both sterile and non-sterile soils, and juvenile sporophytes were cultivated to allow for morphological comparisons with those collected from the wild. One month after sowing the spores germinated in both soils resulting in a uniseriate germ filament Vittaria-type, and differentiated into laminar gametophytes, forming a Ceratopteris-type prothallus. The first leaf of the sporophyte emerged two months after sowing, and its development was completed one month later. Based on our studies, we propose that seedlings cultivated from spores germinated in soil can be used for the reintroduction of endangered fern species

A community-derived classification for extant lycophytes and ferns

Phylogeny has long informed pteridophyte classification. As our ability to infer evolutionary trees has improved, classifications aimed at recognizing natural groups have become increasingly predictive and stable. Here, we provide a modern, comprehensive classification for lycophytes and ferns, down to the genus level, utilizing a community-based approach. We use monophyly as the primary criterion for the recognition of taxa, but also aim to preserve existing taxa and circumscriptions that are both widely accepted and consistent with our understanding of pteridophyte phylogeny. In total, this classification treats an estimated 11 916 species in 337 genera, 51 families, 14 orders, and two classes. This classification is not intended as the final word on lycophyte and fern taxonomy, but rather a summary statement of current hypotheses, derived from the best available data and shaped by those most familiar with the plants in question. We hope that it will serve as a resource for those wanting references to the recent literature on pteridophyte phylogeny and classification, a framework for guiding future investigations, and a stimulus to further discourse

A community-derived classification for extant lycophytes and ferns

Phylogeny has long informed pteridophyte classification. As our ability to infer evolutionary trees has improved, classifications aimed at recognizing natural groups have become increasingly predictive and stable. Here, we provide a modern, comprehensive classification for lycophytes and ferns, down to the genus level, utilizing a community-based approach. We use monophyly as the primary criterion for the recognition of taxa, but also aim to preserve existing taxa and circumscriptions that are both widely accepted and consistent with our understanding of pteridophyte phylogeny. In total, this classification treats an estimated 11 916 species in 337 genera, 51 families, 14 orders, and two classes. This classification is not intended as the final word on lycophyte and fern taxonomy, but rather a summary statement of current hypotheses, derived from the best available data and shaped by those most familiar with the plants in question. We hope that it will serve as a resource for those wanting references to the recent literature on pteridophyte phylogeny and classification, a framework for guiding future investigations, and a stimulus to further discourse