Frond development and phenology of Thelypteris limbosperma, Athyrium distentifolium, and Matteuccia struthiopteris in Western Norway

摘要: Odland, A. 1995. Frond development and phenology of Thelypteris limbosperma, Athyrium distentifolium, Matteuccia struthiopteris in Western Norway. — Nord. J. Bot. 15: 225–236. Copenhagen. ISSN 0107–055X. The pattern growth fronds has been investigated, with particular emphasis on height increments the sporophytes fertile fronds. In order to study both interspecific intraspecific differences, fern stands along altitudinal gradients have monitored. To investigate initiation fertility, representing different developmental stages sampled. Climatic data collected a data-logger during periods. The ferns show significant differences phenology. curve that is best described as monomolecular, characterised by high rates early stage, while limbosperma distentifolium follow logistic curve. The species need periods time develop their main frond elongation does not start before soil temperature reached 7 C. After that, mainly controlled air temperature. Within interval when mean maximum temperatures are 8–20 C, all three showed increased increasing temperatures, but increase was greatest M. struthiopteris. At higher rate T. decreased. producing sori at an stage. Fertile strurhiopteris developed much later needs longer period produce mature than other species. investigation indicates plant determined internal external factors. It concluded rate, phenology, ability reveal close similarities response environmental variables, hence broad-scale geographical distributional patterns.