Amanita macerisolum - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella
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name Amanita macerisolum
name status nomen provisorum
author Tulloss
english name "Poor Soil Lepidella"
images


  • 1. Amanita macerisolum, S of Apache, Cochise Co., Arizona, U.S.A.  (RET 023-6)



  • 2. Amanita macerisolum, Gila Nat. For., SW of Silver City, Grant Co., New Mexico, U.S.A.  (RET 517-1)


  • 3. Amanita macerisolum, Gila Nat. For., SW of Silver City, Grant Co., New Mexico, U.S.A.  (RET 517-1)



  • 4. Amanita macerisolum, Gila Nat. For., SW of Silver City, Grant Co., New Mexico, U.S.A.  (RET 517-1)


  • 5. Amanita macerisolum, Encanto, San Diego, San Diego Co., California, U.S.A.  (RET 613-3)


  • 6. Amanita macerisolum, Encanto, San Diego, San Diego Co., California, U.S.A.  (RET 613-3)



  • 7. Amanita macerisolum, Mission Trails Reg. Pk., San Diego Co., California, U.S.A.  (RET 723-4)


  • 8. Amanita macerisolum, Mission Trails Reg. Pk., San Diego Co., California, U.S.A.  (RET 723-4)

    • intro Amanita macerisolum is a species that lives in dry soils, but has adapted to watered lawns in southern California.  Morphologically and genetically, it belongs with the group of nonmycorrhizal amanitas in Amanita [sect. Lepidella] subsect. Vittadiniae Bas..
    cap The cap is about 77 mm wide with whitish to tan flat scales intimately connected to a whitish surface.  The cap can be up to 13 mm thick at the stem and thins evenly toward the edge.  The shape is plano-convex to convex with a veil present in light brown to grayish brown to pale gray in patches that are not easily removed.  The scales of the veil tend to thickest toward the cap edge and to become progressively thinner toward the cap' center.  The flesh of the cap is white.
    gills The gills of A. macerisolum vary from free and rounded towards the stem to broadly attached to the stem.  They are up to 16 mm broad and widest at the middle of the gill.  The edges of the gills may be decorated with a little fringe of fine powder.  The gills are white when young and become dull yellowish to honey-colored to primrose as the mushroom ages.
    stem The white fleshed, solid stem of A. macerisolum measures roughly 40 × 9 mm and tapers slightly downward; the stem's base is not pointed.  The stem flares at the apex, and a partial veil may be found as tufts or in a ragged ring and eventually may be lost.  The volva may be present as white to brownish scales on the lower stem.
    odor/taste Collectors report that A. macerisolum has an “aromatic or minty” or “mushroomy” odor.  The taste is reported to be “very mild” or “common lepidella flavor.”
    spores The spores of this mushroom measure (8.8-) 10.5 - 13.5 (-14.5) × (6.8-) 7.8 - 9.5 (-10.8) µm and are amyloid and broadly ellipsoid to ellipsoid to (infrequently) elongate.  Clamps are plentiful at bases of basidia.
    discussion This description is based on samples collected in Baja California, México as well as in southern California and New Mexico.

    This mushroom is reported to appear in very wet years, usually distant from woody plants.  [In one case, the species was found in a wooded area with Junipers (Juniperus) and Emory Oaks (Quercus emoryi).]  Amanita macerisolum is probably not symbiotic with woody plants and is related to such species as A. prairiicola and A. pruittii.—R. E. Tulloss and A. S. Wu
    brief editors RET

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