Flora da Usina S？o José, Igarassu, Pernambuco: Orchidaceae

orchidaceae was recently pointed as the most representative family in atlantic forest. based on the lack of data and the fragmentation with lost of diversity, this paper provides a checklist of the orchids in some fragments of atlantic rainforest in usina s？o josé (usj), pernambuco, brazil. the study area includes six forest fragments in igarassu, pernambuco. fieldwork was carried out from december/2008 to march/2010. the vouchers were deposited at ufp herbarium. orchidaceae is represented by 27 species and 19 genera which epidendrum l. (4 spp.) and scaphyglottis poepp. & endl.(3 spp.) were the richest in number of species. this work increases 20 spp. to that recorded for usj in previous checklist. three species are recorded here for the first time for the atlantic rainflorest, and one is a new record to northeastern brazil. cattleya granulosa lindl. and zygostates bradei (schltr.) garay are considered threatened. the piedade remain is noteworthy for having 26 spp., which is a rppn. the data shows the importance of the area to conservation of the biodiversity in the state.