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DOI: 10.3852/09-010
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Mycologia, 102(1), 2010, pp. 153-162.
© 2010 by The Mycological Society of America

Two Lactarius species associated with a relict Fagus grandifolia var. mexicana population in a Mexican montane cloud forest


L. Montoya 1

     Biodiversidad y Sistemática, Instituto de Ecología, A.C., P.O. Box 63, Xalapa, Veracruz 91000, México

I. Haug

     Spezielle Botanik und Mykologie, Universität Tübingen, Auf der Morgenstelle 1, D-72076 Tübingen, Germany

V.M. Bandala

     Biodiversidad y Sistemática, Instituto de Ecología, A.C., P.O. Box 63, Xalapa, Veracruz 91000, México

Ectomycorrhizal (EM) fleshy fungi are being monitored in a population of Fagus grandifolia var. mexicana persisting in a montane cloud forest refuge on a volcano in a subtropical region of central Veracruz (eastern Mexico). The population of Fagus studied represents one of the 10 recognized forest fragments still housing this tree genus in Mexico. This is the first attempt to document EM fungi associated with this tree species in Mexico. We present evidence of the ectomycorrhizal symbiosis for Lactarius badiopallescens and L. cinereus with this endemic tree. Species identification of Lactarius on Fagus grandifolia var. mexicana was based on the comparison of DNAsequences (ITS rDNA) of spatiotemporally co-occurring basidiomes and EM root tips. The host of the EM tips was identified by comparison of the large subunit of the ribulose-bisphosphate carboxylase gene (rbcL). The occurrence of Lactarius badiopallescens and L. cinereus populations in the area of study represent the southernmost record known to date of these two species in North America and are new for the Neotropical Lactarius mycota. Descriptions coupled with illustrations of macro- and micromorphological features of basidiomes as well as photographs of ectomycorrhizas are presented.

Key words: ectomycorrhizal fungi, Neotropical fungi, Russulaceae, Russulales, taxonomy

1 Corresponding author. E-mail: leticia.montoya{at}inecol.edu.mx






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Copyright © 2010 by The Mycological Society of America.