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Abstract
Two new species of Hydnum, characterized by slender Hydnum rufescens-like basidiomes and ovoid to broadly ellipsoid basidiospores, are described from the Iberian Peninsula based on morphological and ITS molecular data. Hydnum ovoideisporum is distinguished by pilei with deep orange tones and strong preference for calcareous soil. It is widespread in the Iberian-Mediterranean area. Hydnum vesterholtii is characterized by its ocher to light ocher pileus, and nearly all the collections were made in the Pyrenees. Both ovoid-spored species are monophyletic well supported groups in the maximum parsimony and Bayesian ITS phylogenies, while the remainder of the samples assigned to H. rufescens s.l. and having globose basidiospores split into six well supported clades. The need to typify the name Hydnum rufescens is discussed, and a provisional key is given for the European taxa of Hydnum.
Acknowledgments
This paper is dedicated to Jan Vesterholt who provided valuable Hydnum material that was extremely useful to the first author in the pursuit of the doctorate degree. We thank José Luis Terés for collecting one of the H. ovoideisporum specimens. Dagmar Triebel (M) and Mercedes Herrera (BIO) handled the loan of the holotype of H. ellipsosporum. We also are grateful for the help of Vincent Demoulin for his nomenclatural advice, as well as for the help of Maria Prieto for her comments on the manuscript. Thanks to Marian Glenn for checking the English.
This work has been partially supported (I. Olariaga) by a grant for Training of Researchers from the Basque Government (2002/2003), DGI Flora Micológica Ibérica VI (2007–2009) CGL2006-12732-C02-01. The partner from the Slovenian Forestry Institute was co-financed by the Ministry of Higher Education, Science and Technology through Research Program P4-0107 and research project CRP V4-0492 ( Slovenian Research Agency and Ministry of Agriculture, Forestry and Food).