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Abstract
A new nivicolous species of Perichaena is described from the Andes in Argentina. The most conspicuous characteristics of Perichaena megaspora are the large spores and their ornamentation in the form of flattened warts. The 16–21 μm diam spores make the new species unique in the genus in which all other species have spores rarely reaching 15 μm diam. Twenty-two collections were found in the field during two consecutive years at 10 localities in Mendoza province Argentina, including one collection isolated from a moist chamber culture of ground litter. The new species was examined under stereomicroscope, light microscope and scanning electron microscope and micrographs of relevant details are included.
Acknowledgments
This research was supported by the Spanish government (grants CGL205-00320/BOS, CGL2008-00720/BOS, CGL2011-22684), by the Polish National Science Centre (project N N303 799440) and by the SYNTHESYS Project (http://www.synthesys.info/) financed by European Community Research Infrastructure Action under the FP7 Capacities Program at Real Jardín Botánico (CSIC). We thank Jolanta Pia tek for the contour map of South America, Yolanda Ruiz for her technical assistance with SEM and Carlos de Mier for his help with the macrophotograph of the new species.