Rostania revised: testing generic delimitations in Collemataceae (Peltigerales, Lecanoromycetes)

Alica Košuthová; Martin Westberg; Mónica A G Tálora; Mats Wedin

doi:10.3897/mycokeys.47.32227

Rostania revised: testing generic delimitations in Collemataceae (Peltigerales, Lecanoromycetes)

MycoKeys. 2019 Feb 20:(47):17-33. doi: 10.3897/mycokeys.47.32227. eCollection 2019.

Authors

Alica Košuthová¹, Martin Westberg², Mónica A G Tálora³, Mats Wedin¹

Affiliations

¹ Department of Botany, Swedish Museum of Natural History, P.O. Box 50007, SE-104 05 Stockholm, Sweden Swedish Museum of Natural History Stockholm Sweden.
² Museum of Evolution, Uppsala University, Norbyvägen 16, SE-752 36, Uppsala, Sweden Uppsala University Upssala Sweden.
³ Plant Ecological Genetics, Institute of Integrative Biology, ETH Zurich, Universitätstrasse 16, 8092 Zurich, Switzerland Institute of Integrative Biology Zurich Switzerland.

Abstract

Here, we test the current generic delimitation of Rostania (Collemataceae, Peltigerales, Ascomycota) utilizing molecular phylogeny and morphological investigations. Using DNA sequence data from the mitochondrial SSU rDNA and two nuclear protein-coding genes (MCM7 and β-tubulin) and utilizing parsimony, maximum likelihood and Bayesian phylogenetic methods, Rostania is shown to be non-monophyletic in the current sense. A new generic delimitation of Rostania is thus proposed, in which the genus is monophyletic, and three species (Rostaniacoccophylla, R.paramensis, R.quadrifida) are excluded and transferred to other genera. Rostaniaoccultata is further non-monophyletic, and a more detailed investigation of species delimitations in Rostania s. str. is needed. The new combinations Leptogiumparamense and Scytiniumquadrifidum are proposed.

Keywords: Classification; cyanolichens; nomenclature; systematics; taxonomy; thallus anatomy.