Despite extensive study of Amanita by the authors that described the species (R.E Tulloss in USA and E, Pérez-Silva in Mexico) there are only two collections in USA and 5 collections in Mexico. Both USA records are considered as occasional and the assessment is done based on data from Mexico where the species is very rare and associated with severely endangered Abies religiosa and Pinus montezumae high mountain forests.
Amanita longitibiale should be assessed as Endangered (EN) based on the criteria A3c because its main habitat, the high mountain Abies religiosa forest, is expected to decline 87% within the next fifty years due to global warming. The population is severely fragmented with only two known reproductive subpopulations in Mexico, and potential habitat (Abies religiosa forest) is declining due to logging and will decline severely due to climate change.
Amanita longitibiale is clearly delimited by the yellowish-cream at first and grayish-brown to umbrinus color pileus. Universal veil absent or dispersed patches. It has an immediate reaction in the pileus to KOH, turning reddish-orange. The lamellae are free or attached by a line sometimes with a light pink tint. It has a limbate to saccate volva, a radicating stipe bulb, and cylindric to bacilliform spores. Amanita longitibiale was originally described for Mexico as A. peckiana by Herrera y Pérez-Silva (1984), but differs from the latter by the presence of nonappendiculate pileus margin, its more persistent annulus, and its rather deep radicating stipe base. Other similar species are A. cylindrispora which do not has a markedly radicating bulb and has a partial veil rather small and delicate (Tulloss et al., 1995). Another one is Amanita mediinox nom. prov., which has a pileus black to midnight blue at first, becoming mottled steely gray-blue with some greenish tones to grayish upon expansion, and was collected from Tsuga canadensis and Quercus sp. forests in North Carolina USA (Tulloss, Tulloss, & N., 2018). Amanita griseoturcosa is smaller in size, has a grayish-turquoise or turquoise gray to dark turquoise pileus and it was collected in Japan (Tulloss et al., 2018). Amanita virosiformis, has an entire basidiome white and chloride of lime or carrion odor (Tulloss, 2018).
Amanita longitibiale is a rare ectomycorrhizal fungus only known from two fragmented subpopulations in central Mexico and two localities in the USA. The two subpopulations in Mexico are associated to high mountain Abies religiosa and Pinus montezumae forests, this vegetation is critically threatened due to climate change, deforestation and changes in land use. This species should be protected because of its limited distribution to central Mexico, especially associated with endangered forests types.
Amanita longitibiale is distributed in Ajusco Mountain in Mexico City and Estado de Mexico, and Llano Grande and Río frio in the Estado de Mexico. Both collecting sites are in the center of the Transmexican Volcanic Belt. This species grows in Abies religiosa and A. religiosa-Pinus spp forests (Tulloss, Pérez-Silva, & Herrera, 1995). In the USA there are two occasional records in 25 years since the species was described: North Carolina associated with mixed hard-wood forest, and Florida—Brevard Co (Tulloss, 2018).
GBIF (2018) do not register any occurrences. However is known from four sampling localities: two single collections in the USA (North Carolina and Florida); and two locations in the center of the Transmexican Volcanic Belt, Mexico. The mountains of the center of Mexico seem to host the only two known reproductive subpopulations of the species. However, the species has not been recorded since 1993 either in the USA or Mexico. Amanita longitibiale was first described by Tulloss, Pérez-Silva, and Guzmán, who has collected Amanita extensively in USA and Mexico for more than 30 years. So the few existing records do not seem to be a result of undersampling.
Population Trend: Stable
Basidiomes are solitary associated with Abies religiosa and Pinus montezumae forests producing rare sporocarps. Its fruiting season is from July to September, but peaking in July in Mexico.
The two known reproductive subpopulations of Amanita longitibiale grow in Abies religiosa and Pinus montezumae forests. The Abies religiosa forests are subjeted to land cover-change and illegal timber extraction. Additionaly this vegetation is severy threatened by global warming; it has been estimated that by 2060, A. religiosa populations will decline by 87% (Miranda-Aragón et al., 2012; Sáenz-Romero et al., 2016; Sáenz-Romero, Rehfeldt, Duval, & Lindig-Cisneros, 2012).
Two of the four known localities are in the “Sierra de las Cruces” in Mexico, this mountain range is located in between Mexico and Toluca cities. Both are among biggest cities in Mexico and their urban expansion is severely threatening the surrounding forests.
To give priority to Abies religosa as a protected habitat for endangered species of fungi and monarch butterfly.
It is a priority to sequence and conduct phylogenetic analysis of the dried specimens to know if the population in Central Mexico represents the same species of the USA. Also, expand the fungal sampling to the Abies-Pinus forests in the Sierra de las Cruces.
There are not reports about edibility or use of this species, but is suspected to be poisonous.
GBIF Secretariat. (2018). Amanita longitibiale Tulloss, Pérez-Silva & T.Herrera. Retrieved February 14, 2018, from https://www.gbif.org/species/5451995
Miranda-Aragón, L., Treviño-Garza, E. J., Jiménez-Pérez, J., Aguirre-Calderón, O. A., González-Tagle, M. A., Pompa-García, M., & Aguirre-Salado, C. A. (2012). Modeling susceptibility to deforestation of remaining ecosystems in North Central Mexico with logistic regression. Journal of Forestry Research, 23(3), 345–354. http://doi.org/10.1007/s11676-012-0230-z
Sáenz-Romero, C., Lindig-Cisneros, R. A., Joyce, D. G., Beaulieu, J., St. Clair, J. B., & Jaquish, B. C. (2016). Assisted migration of forest populations for adapting trees to climate change. Revista Chapingo Serie Ciencias Forestales Y Del Ambiente, 22(3), 303–323. http://doi.org/10.5154/r.rchscfa.2014.10.052
Sáenz-Romero, C., Rehfeldt, G. E., Duval, P., & Lindig-Cisneros, R. A. (2012). Abies religiosa habitat prediction in climatic change scenarios and implications for monarch butterfly conservation in Mexico. Forest Ecology and Management, 275(0), 98–106. http://doi.org/10.1016/j.foreco.2012.03.004
Tulloss, R. E. (2018). Amanita cylindrispora. Retrieved February 14, 2018, from http://www.amanitaceae.org?Amanita+cylindrispora
Tulloss, R. E. (2018). Amanita longitibiale. Retrieved February 14, 2018, from http://www.amanitaceae.org?Amanita+longitibiale
Tulloss, R. E. (2018). Amanita virosiformis. Retrieved February 14, 2018, from http://www.amanitaceae.org?Amanita+virosiformi
Tulloss, R. E., Pérez-Silva, E., & Herrera, T. (1995). Amanita Longitibiale - a New Species of Amanita Section Phalloideae From Central Mexico and Southeastern Usa. Mycotaxon, 54(January), 195–202.
Tulloss, R. E., Tulloss, R., & N., G. (2018). Amanita mediinox. Retrieved February 14, 2018, from http://www.amanitaceae.org?Amanita+mediinox