caa a22 4500 47580712X CHVBK 20180406123750.0 cr unu---uuuuu 170329e20000901xx s 000 0 eng 10.1007/BF00985045 doi (NATIONALLICENCE)springer-10.1007/BF00985045 Schölch Annette née Thorspecken, Langgewann 22, D-69121, Heidelberg, Federal Republic of Germany aut Relations between submarginal and marginal sori in ferns [Elektronische Daten] II. The sori of selected Dicksoniaceae and Hymenophyllaceae [Annette Schölch] The sori of the Dicksoniaceae and Hymenophyllaceae represent further examples of the "basipetal marginal sorus” as defined in a previous paper. Marginal sori arise as the result of a distinct differentiation of the sporophyll into a vegetative and a reproductive phase. Phase differentiation may have occurred more than once in evolution, and the occurrence of the basipetal marginal sorus, therefore, may include homologous convergences. With regard to the phylogenetic relationships the present studies allow the following conclusions: (1) Because of the marginal position and the high complexity of the sori, the Dicksoniaceae and Hymenophyllaceae cannot be considered primitive groups. (2) The sorus of the Hymenophyllaceae corresponds neither to that ofDennstaedtia nor to that ofDicksonia; the similarity is due to homologous convergence. Therefore, the Hymenophyllaceae cannot be regarded as closely related to the Dennstaedtiaceae or the Dicksoniaceae. Springer-Verlag, 2000 Pteridophyta nationallicence Dicksoniaceae nationallicence Hymenophyllaceae nationallicence Dicksonia nationallicence Mecodium nationallicence Polyphlebium nationallicence Sphaerocionium nationallicence soral development nationallicence basipetal marginal sorus nationallicence phase differentiation in leaf development nationallicence convergence nationallicence phylogeny nationallicence Plant Systematics and Evolution Springer-Verlag 220/3-4(2000-09-01), 185-198 0378-2697 220:3-4<185 2000 220 606 https://doi.org/10.1007/BF00985045 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00985045 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Schölch Annette née Thorspecken, Langgewann 22, D-69121, Heidelberg, Federal Republic of Germany aut NATIONALLICENCE 773 0- Plant Systematics and Evolution Springer-Verlag 220/3-4(2000-09-01), 185-198 0378-2697 220:3-4<185 2000 220 606 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 47580712X BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer