Phylogenetic relationships within the fern genus Hymenophyllum s.l. (Hymenophyllaceae, Filicopsida): contribution of morphology and cytology.
The phylogenetic relationships of Hymenophyllum and its segregate genera Cardiomanes, Hymenoglossum, Rosenstockia, Serpyllopsis and Microtrichomanes are addressed, using 31 morphological characters of the sporophyte and one cytological character. As expected, this study reveals considerable morphological heterogeneity within the genus sensu lato, but several apomorphic changes allow support for some clades. Four unresolved taxa, Cardiomanes, Hymenoglossum, Diplophyllum and Mecodium pro parte are probably the most basal elements in Hymenophyllum. The analysis also suggests the polyphyly of Mecodium, and two unexpected associations: Sphaerocionium together with Microtrichomanes; and a broad clade composed of subg. Hymenophyllum, Hemicyatheon and Craspedophyllum, genera Rosenstockia and Serpyllopsis, and subsect. Leptocionium and Amphipterum. These associations appear justified by morphological, cytological or geographical data, and most of them are in agreement with preliminary molecular results.
Hennequin
Sabine
S
Laboratoire de paléobotanique et paléoécologie, université Pierre-et-Marie-Curie et IFR 101 CNRS Institut d'écologie fondamentale et appliquée, 12, rue Cuvier, 75005 Paris, France. sabine.hennequin@snv.jussieu.fr
D029624:Ferns / Q000033:anatomy & histology / Q000145:classification* / Q000166:cytology / Q000235:genetics; D010802:Phylogeny