Abstract
Matsutake fungi include a complex of edible mushrooms highly prized worldwide, particularly in Japan where they are considered one of the most luxurious ingredients. These species establish ectomycorrhizal symbioses with angiosperms and gymnosperms in the Northern Hemisphere and in North America only three species are currently known. In the present contribution a fourth species of this geographical area is described, Tricholoma colposii sp. nov. is described from Veracruz state, in eastern Mexico based on morphological and molecular (nrITS) data. This species is characterized by middle size basidiomata, with orange brown to brown pileus and stipe, squamose when young and with appressed scales in maturity, cylindric, fibrillous to scaly stipe, with globose to ellipsoid (4.5–)5–6 (–7) × (3–) 4–5 (–6) μm smooth spores, sporomes with sweet fruit odor and raw green bean flavour. The species grows associated with Pinus teocote forests. The macro- and micromorphological characters in conjunction with the nrITS-based phylogenetic analysis using Maximum Likelihood method and Bayesian inference support the proposal of this new species of Mexican matsutake. Detailed descriptions, photographs and comparisons with phenetic and phylogenetic related species are presented.
References
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<p>Huelsenbeck, J.P. & Ronquist, F. (2001) MrBayes: Bayesian inference of phylogeny. <em>Bioinformatics</em> 17: 754−755. https://doi.org/10.1093/bioinformatics/17.8.754</p>
<p>Katoh, K. & Standley, D.M. (2013) MAFFT multiple sequence alignment software version 7: improvements in performance and usability. <em>Molecular Biology and Evolution</em> 30: 772−780. https://doi.org/10.1093/molbev/mst010</p>
<p>Katoh, K., Misawa, K., Kuma, K. & Miyata, T. (2002) MAFFT: a novel method for rapid multiple sequence alignment based on fast Fourier transform. <em>Nucleic Acids Research</em> 30: 3059–3066. https://doi.org/10.1093/nar/gkf436</p>
<p>Katoh, K., Rozewicki, J. & Yamada, K.D. (2017) MAFFT online service: multiple sequence alignment, interactive sequence choice and visualization. <em>Briefings in Bioinformatics</em> 20: 1160−1166. https://doi.org/10.1093/bib/bbx108</p>
<p>Kikuchi, K., Matsushita, N., Guerin-Laguette, A., Ohta, A. & Suzuki, K. (2000) Detection of <em>Tricholoma matsutake</em> by specific ITS primers. <em>Mycological Research</em> 104: 1427–1430.</p>
<p>Kytövuori, I. (1989) The <em>Tricholoma caligatum</em> group in Europe and North Africa. <em>Karstenia</em> 28: 65–77. https://doi.org/10.29203/ka.1988.266</p>
<p>Lanfear, R., Calcott, B., Kainer, D., Mayer, C. & Stamatakis, A. (2014) Selecting optimal partitioning schemes for phylogenomic datasets. <em>BMC Evolutionary Biology</em> 14: 1−14. https://doi.org/10.1186/1471-2148-14-82</p>
<p>Lanfear, R., Frandsen, P.B., Wright, A.M., Senfeld, T. & Calcott, B. (2017) Partition Finder 2: New methods for selecting partitioned models of evolution for molecular and morphological phylogenetic analyses. <em>Molecular Biology and Evolution</em> 34: 772−773. https://doi.org/10.1093/molbev/msw260</p>
<p>Lodge, D.J., Ammirati, J.F., Dell, T.O. & Mueller, G.M. (2004) Terrestrial and Lignicolous Macrofungi: Colecting and describing macrofungi. <em>In</em>: Mueller, G., Bills, G.F. & Foster, M.S. (Eds.) <em>Biodiversity of Fungi</em>. Inventary and Monitoring Methods. Elsevier Academic Press pp. 128–158.</p>
<p>Lodge, D.J., Padamsee, M., Matheny, P.B., Aime, M.C., Cantrell, S.A., Boertmann, D., Kovalenko, A., Vizzini, A., Dentinger, B.T.M., Kirk, P.M., Ainsworth, A.M., Moncalvo, J.-M., Vilgalys, R., Larsson, E., Lücking, R., Griffith, G.W., Smith, M.E., Norvell, L.L., Desjardin, D.E., Redhead, S.A., Ovrebo, C.L., Lickey, E.B., Ercole, E., Hughes, K.W., Courtecuisse, R., Young, A., Binder, M., Minnis, A.M., Lindner, D.L., Ortiz-Santana, B., Haight, J., Læssøe, T., Baroni, T.J., Geml, J. & Hattori, T. (2014) Molecular phylogeny, morphology, pigment chemistry and ecology in Hygrophoraceae (Agaricales). <em>Fungal Diversity</em> 64: 1–99. https://dx.doi.org/10.1007/s13225-013-12559-0</p>
<p>Martínez-González, C.R., Ramírez-Mendoza, R., Jiménez-Ramírez, J., Gallegos-Vázquez, C. & Luna-Vega, I. (2017) Improved method for genomic DNA extraction for <em>Opuntia</em> Mill. (Cactaceae). <em>Plant Methods</em> 13: 1−10. https://doi.org/10.1186/s13007-017-0234-y</p>
<p>Matheny, P.B., Curtis, J.M., Hofstetter, V., Aime, M.C., Moncalvo, J.-M., Ge, Z.-W., Slot, J.C., Ammirati, J.F., Baroni, T.J., Bougher, N.L., Hughes, K.W., Lodge, D.J., Kerrigan, R.W., Seidl, M.T., Aanen, D.K., DeNitis, M., Daniele, G.M., Desjardin, D.E., Kropp, B.R., Norvell, L.L., Parker, A., Vellinga, E.C., Vilgalys, R. & Hibbett, D.S. (2006) Major clades of Agaricales: A multilocus phylogenetic overview. <em>Mycologia</em> 98: 982–995. https://dx.doi.org/10.3852/mycologia.98.6.982</p>
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