| name | Amanita vetinummus |
| name status | nomen provisorum |
| author | Tulloss |
| english name | "Silver Dollar Ringless Amanita" |
| images |
 1. Amanita vetinummus, Chiricahua Mtns., Cochise Co., Arizona, U.S.A. |
| intro | The following is based on original research by RET. |
| cap | The cap is 29 - 58 mm wide and pale gray to pale silver. It darkens slightly when bruised, and is hemispheric to convex. Flesh is gray or white with a grayish cone-shaped region pointing downward above the stem. The edge of the cap is grooved for about one-third of the radius, volval remnants are absent or in white lumpy, irregular, membranous patches covering much of cap and separating easily from it. The volva discolors to dingy buff or yellowish, especially on high points. |
| gills | The gills are narrowly attached or free. They are crowded, white to off-white to pale gray, and do not bruise or stain when cut. Short gills are of diverse lengths, unevenly distributed, and squarely cut off. |
| stem | The stem is 37 - 124 × 5 - 8.5 mm, white, and becomes pale gray with age or handling. It narrows upward or is cylindric, sometimes flaring at the top. The stem is decorated by very fine grooves running along its length and/or by fine fibrils especially in the lower part of the stem. The uppermost part of stem may be chalky or bear fine raised flecks. The stuffed stem's flesh is white or whitish above and somewhat gray to pale gray below, sometimes pale grayish ocher in the volva below the stem base. The volva is sack-like, white, soft,and membranous, with an irregular edge. It often flares above the point of its attachment to the stem (about one quarter to one third of the distance from stem base to highest point on the sack). The volva, which has a cone like base, eventually collapses against the stem. The volva has an internal limb connected just above the point of the volva's attachment to the stem; the internal limb may be reduced only to a shelf-like projection from the volva. |
| odor/taste | Odor was indistinct, taste was not recorded. |
| spores | The spores measure (8.2-) 8.5 - 12.5 × (6.5-) 7.2 - 10.2 (-11.5) µm and are inamyloid, subglobose to broadly ellipsoid to ellipsoid. Clamps are probably lacking at base of basidia. |
| discussion | Described from Arizona (at an elevation of over 2400 m) where it is solitary to grouped. Present in loam and litter, under Arizona pines or in the sand and gravel of a jeep track with spruce, douglas-fir, and quaking aspen. Reader may wish to compare this taxon with another from the Chiricahua Mountains—Amanita mobilimanica Tulloss nom. prov.—R. E. Tulloss and N. Goldman |
| brief editors | RET |
Spore data sets and their composite