Abstract
Two species of Laccaria discovered in relicts of Fagus grandifolia var. mexicana forests in eastern Mexico are described based on the macro- and micromorphological features, and their identity supported by molecular analysis of the internal transcribed spacer (ITS) and large subunit (LSU) of the ribosomal RNA gene. The phylogeny obtained here showed that one of the Mexican species is nested in an exclusive clade which in combination with its striking morphological features, infers that it represents a new species, while the other species is placed as a member in the Laccaria trichodermophora clade. This is the first report in Mexico of Laccaria with Fagus grandifolia var. mexicana trees, with which the reported species may form ectomycorrhizal association. Descriptions are accompanied with illustrations of macro- and micromorphological characters and a discussion of related taxa are presented.
Highlights
It has long been recognized that Laccaria species are important ectomycorrhizal associates of ectotrophic plants worldwide (Mueller 1992)
A wide ectomycorrhizal host range has been attributed to L. amethystina, but in this case it has some support for its generalist abilities at the population genetics level by Roy et al (2008), while consideration for cryptic biological species was discarded, at least among the populations sampled in France
The phylogenetic analysis was performed with the sequences obtained in this study, as well as some retrieved from GenBank derived from the Blast analysis, and complemented with related sequences used by Osmundson et al (2005), Montoya et al (2015) and Wilson et al (2017) (Table 1)
Summary
It has long been recognized that Laccaria species are important ectomycorrhizal associates of ectotrophic plants worldwide (Mueller 1992). Some species as Laccaria laccata and L. bicolor have been considered host-generalists, and inclusive, have been subject of a lot of in vitro experimentation worldwide. A wide ectomycorrhizal host range has been attributed to L. amethystina, but in this case it has some support for its generalist abilities at the population genetics level by Roy et al (2008), while consideration for cryptic biological species was discarded, at least among the populations sampled in France
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