Albomagister Sanchez-Garcia, Birkebak & Matheny

Albomagister Sánchez-García, Birkebak & Matheny, Taxon 63(5): 1000. 2014. TYPE: Albomagister subaustralis (A.H. Sm. & Hesler) Sánchez-García, Birkebak & Matheny. DESCRIPTION: Habit tricholomatoid, mycenoid, or inocyboid. Lamellae sinuate to adnexed, white, cream, yellowish, and at times drying ocher-yellow. Basidiospores smooth, thin-walled (less often with thickened wall), and inamyloid (less often weakly amyloid or dextrinoid). Pleurocystidia present and conspicuous in most species, thin-walled or with slightly thickened walls, hyaline. Cheilocystidia similar to pleurocystidia and present in all species. Pileipellis a cutis, often with ascending interwoven cylindric elements. Lamellar trama parallel. Clamp connections present, common, and easy to observe. On soil. North American taxa occur in forests under ectomycorrhizal trees, but European taxa occur among non-ectomycorrhizal plants such as Buxus. Occurring in North America, Europe, and New Zealand. TAXONOMIC NOTES: The genus is emended here to include at least one new species without pleurocystidia and other species with a mycenoid to inocyboid habit as first noted by Corriol and Jargeat (2018). Moreau et al. (2015) and Moyne and Moingeon (2018) reported faintly amyloid basidiospores in A. alesandrii, and Corriol and Jargeat (2018) reported a small percentage of spores with a dextrinoid reaction in A. virgineus. In some species a small proportion of spores may be larger and display a thickened wall (Moreau et al. 2015; Corriol and Jargeat 2018; Moyne and Moingeon 2018). Stable isotope values of carbon and nitrogen support the ectomycorrhizal status of A. subaustralis, the type of the genus (Sánchez-García and Matheny 2017), but occurrence of the two European species with non-ectomycorrhizal plants, viz. Buxus sempervirens, suggests these are not ectomycorrhizal.