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Em Santa Catarina, a Floresta Pluvial Subtropical encontra-se alterada, sobretudo em sua composicao e estrutura. Assim, trabalhos que caracterizem os remanescentes florestais sao importantes, pois podem servir de base para estudos de meta-analise. Neste trabalho, foi caracterizada a composicao e a estrutura de uma Floresta Pluvial Subtropical e comparou-se a composicao de especies dessa floresta com outras da mesma fitofisionomia. A vegetacao foi amostrada em 25 parcelas de 400 m², em que foram medidos os individuos com DAP ≥ 5 cm. Foram amostrados 1.727 individuos, distribuidos em 144 especies, 91 generos e 45 familias. Myrtaceae, Lauraceae e Fabaceae foram as familias mais ricas, com destaque para os generos Ocotea , Myrcia e Eugenia . As especies com maior percentual de importância foram Euterpe edulis Mart., Sloanea guianensis (Aubl.) Benth., Ocotea aciphylla (Nees & Mart.) Mez e Tapirira guianensis Aubl. Foram detectados dois grupos floristicos que se formaram devido a proximidade geografica, sendo o primeiro grupo formado pelos estudos realizados na regiao sul-catarinense e o segundo por estudos realizados na regiao do Vale do Itajai. Os resultados indicaram que a floresta e composta por especies climax tolerantes a sombra e pode ser caracterizada como um remanescente de vegetacao bem conservado, indicando sua importância para conservacao. Abstract Phytosociology of a primary Subtropical Rain Forest in southern Brazil . The Subtropical Rain Forest is altered in Santa Catarina regarding its composition and structure. Thus, the studies that focus on these forest remnants are important because they can consist as a basis for meta-analysis. In this work research we intend to characterize the composition and structure of a Subtropical Rain Forest stand and compare the species composition of this stand with others in the same forest type. The vegetation was sampled through 25 sample plots of 400 m², where individuals with DBH ≥ 5 cm were measured. We sampled 1,727 individuals belonging to 144 species, 91 genus and 45 families. Myrtaceae, Lauraceae and Fabaceae were the richest families, especially the Ocotea , Eugenia and Myrcia genus. The species with the highest importance percentual were Euterpe edulis Mart., Sloanea guianensis (Aubl.) Benth., Ocotea aciphylla (Nees & Mart.) Mez, Tapirira guianensis Aubl. We detected two floristic groups formed due to geographical proximity; the first was formed by studies conducted in the southern region and the second by studies conducted in the Itajai Valley. Our results indicated that the studied forest stand is composed primarily of shade-tolerant climax species and can be characterized as a well-preserved forest remnant. The results indicate the importance of this area for conservation. Keywords : Composition; structure; ecological groups; similarity; Itajai Valley.

FITOSSOCIOLOGIA DE UMA FLORESTA PLUVIAL SUBTROPICAL PRIMÁRIA NO SUL DO BRASIL