Omphalotus mexicanus is a unique member of the genus, easy to recognize because of its dark blue basidiome, tinted with yellow to orange mainly at the base. It was described as new to science in 1984 by Mora and Guzmán. It contains the compounds illudin S and illudin M. Its distribution is limited to mixed and oak (temperate) forest in northern neotropics, in the highlands of Mexico and Guatemala, a habitat highly threatened (Luna-Vegat et al., 2006).
Vulnerable under IUCN C2a(i) criteria because of small population limited to veteran oak trees and other hardwoods.
Omphalotus mexicanus is an exclusively neotropical species with limited range from Mexico (Aguascalientes, Colima, Guanajuato, Jalisco, Michoacán, Morelos, Oaxaca, State of Mexico) to Guatemala.
≤ 15 known localities, most finds in Mexico. Though a saprotroph only 1-2 genets per site because the restricted habitat to veteran trees.
Population Trend: Deteriorating
Saprotroph, reported only on hardwood, mostly oaks, restricted to veteran trees. Specific tree host unknown (10-20 different oak and other harwoods per site).
Mexican and Central American temperate forests, associated with mountain chains; are among those preferred ecosystems for activities such as agriculture and animal husbandry. Therefore temperate areas are considered habitats that have been highly disturbed and they are most threatened because more or less 30% has been deforested so far and it will continue to decline (Luna-Vega et al., 2006).
Mainly site protection, small scale wood extraction regulation.
We need to know specific plant hosts, the exact sizes of individuals and populations and the influence of nature conditions on fruiting.
Leopoldo Galicia and Leticia Gomez-Mendoza (2010). Temperate Forests and Climate Change in Mexico: from Modelling to Adaptation Strategies, Climate Change and Variability, Suzanne Simard (Ed.), ISBN: 978-953-307-144-2, InTech, Available from: http://www.intechopen.com/books/climate-change-andvariability/temperate-forests-and-climate-change-in-mexico-from-modelling-to-adaptation-strategies.
Mora VM, Guzmán ,1984. Agaricales poco conocidos en el Estado de Morelos [Agaricales little known in the state of Morelos Mexico].Boletín de la Sociedad Mexicana de Micología 18: 115–39.
Kirchmair M, Poder R, Huber CG, Miller OK., 2002. Chemotaxonomical and morphological observations in the genus Omphalotus (Omphalotaceae). Persoonia 17 (4): 583–600.
Kirchmair M, Morandell S, Stolz D, Poder R, Christian Sturmbauer C, 2004. Phylogeny of the genus Omphalotus based on nuclear ribosomal DNA-sequences. Mycologia, 96(6), 2004, pp. 1253–1260.
Petersen, RH.; Hughes, KW, 1997. Mating systems in Omphalotus (Paxillaceae, Agaricales). Plant Systematics and Evolution 211(3-4): 217–29.
Luna-Vega I, Alcántara Ayala O, Contreras-Medina RL, Ponce-Vargas A, 2006. Biogeography, current knowledge and conservation of threatened vascular plants characteristic of Mexican temperate forests. Biodiversity and Conservation 15:3773–3799 DOI 10.1007/s10531-005-5401-1