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In the present work, we aimed to evaluate successional forest stage and horizontal, vertical and diametric structures of upper and under strata on a secondary forest stretch under Araucaria angustifolia on the Bananal Ecological Station, São Paulo state, Brazil. During upper stratum survey (circumference at breast height (CBH) > 15 cm), 43 permanent plots of 10 × 20 m were established. In each plot, five sub-plots of 1 × 1 m were randomly allocated for under stratum (total height > 30 cm and CBH <15 cm) survey. Regarding upper stratum, density and dominance were estimated on 2142 ind./ha and 32.49 m²/ha, respectively, in absolute total values. Concerning under stratum, total absolute density was estimated on 48,302 ind./ha. The diametric structure of the community follows the J-invert pattern, which was not observed for Brazilian Pine population, compromising its maintenance in the community. The auto-ecology of the species supports the catalyzation of secondary succession under its crown, which was classified at middle successional stage.O presente estudo teve por objetivo caracterizar o estágio sucessional e as estruturas horizontal e vertical dos estratos adulto e regenerante de um trecho de floresta secundária com Araucaria angustifolia, na Estação Ecológica de Bananal-SP, Brasil. Para amostragem do estrato adulto (CAP > 15 cm), foram alocadas 43 parcelas permanentes de 10 × 20 m. Em cada uma destas, foram aleatoriamente distribuídas cinco subparcelas de 1 × 1 m, para amostragem do componente regenerante (altura > 30 cm e CAP < 15 cm). Considerando-se o componente adulto, a densidade e a dominância foram estimadas em 2.142 ind./ha e 32,49 m²/ha, respectivamente, em valores totais absolutos. Para o componente regenerante, o valor estimado para a Densidade Total absoluta foi de 48.302 ind./ha. A estrutura diamétrica da comunidade segue o padrão J-invertido, o qual não ocorre na população de A. angustifolia; tal condição pode vir a comprometer a manutenção dessa espécie na comunidade

Fitossociologia de uma floresta secundária com Araucaria angustifolia (Bertol.) O. Kuntze na Estação Ecológica de Bananal, Bananal, SP