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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
Reproductive modes and hybridization within Cystopteris fragilis agg.
 Ptáček, Jan ; Urfus, Tomáš (advisor) ; Šrámková, Gabriela (referee)
Cystopteris fragilis agg. is taxonomically very complicated group of homosporous ferns. There are 4 species of the aggregate in Europe (C. fragilis, C. dickieana, C. alpina and C. diaphana), which are morfologically similar and their taxonomic status is still unresolved. Polyploidization, hybridization and the resulting reticulate patterns of evolution together contribute to enormous variation within the complex. Apomictic reproduction through apogamy is a very common phenomenon among ferns and it was also recorded in C. fragilis in the past. Gametophyte and sporophyte culture is commonly used to the study of reproductive modes. Pilot results and methods of following diploma thesis are presented in separeted chapter.
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