1983. Spore studies in the genus Gymnocarpiurn. Can. J. Bot. 61: 377-388. Scanning electron microscopy was used to examine the variation in perispore characters within and between six currently recognized taxa of the genus Gyrnnocarpiurn Newm. in North America. Representative scanning electron micrographs are presented and depict the perispore features observed. Spores of those taxa studied here do not each possess a distinctive morphology providing practical species discrimination, rather they

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... all exhibit similar patterns of variation. Spore size was also examined and shown to be correlated to ploidy level, permitting positive identification of the diploid taxon G . dryopteris ssp. disjuncturn from the tetraploid G . dryopteris ssp. dryopteris. PRYER , K. M., et D. M. BRITTON. 1983. Spore studies in the genus Gyrnnocarpiurn. Can. J. Bot. 61: 377-388. La rnicroscopie Clectronique A balayage a Ct C utilisCe pour Ctudier la variation des caracteres de la ptrispore dans six taxons du genre Gyrnnocarpiurn Newm. en AmCrique du Nord. Des micrographies au MEB sont prCsentCes et illustrent les caractCristiques observCes sur les pCrispores. Les taxons CtudiCs ici ne posskdent pas tous, au niveau de la pCrispore, des caractkr~s morphologiques distinctifs permettant une separation pratique des espkces, mais ils montrent plut6t des patrons de variation semblables. La dimension des spores a Cgalement Ct C examinee; elle est corrClCe avec le niveau de plo'idie et elle permet donc de sCparer le taxon diplo'ide G. dryopteris spp. disjuncturn du tktraplolde G. dryopteris spp. dryopteris. [Traduit par le journal] 'present address: