|
[ Section Validae page. ]
[ Amanita Studies home. ]
[ Keys & Checklist/Picturebooks ] "Old Potato Amanita"
Technical description (t.b.d.) BRIEF DESCRIPTION: The following is based on the original description by Stewart and Grund (1974). The cap of Amanita solaniolens is 39 - 45 mm wide, dull-yellow to light blond at the margin, abruptly darkening to olive brown at the center, with a greenish tinge over the entire cap, broadly convex to plane, viscid when moist, fibrillose-silky, and with a nonstriate margin. The volva is present as one or two large, flat patches, and creamy white to yellowish white. The flesh is firm and white, except for a narrow creamy white region just under the cap skin. The gills are free, moderately close, creamy white to yellowish white, 4 - 5 mm broad, with a minutely floccose edge. The short gills are rounded truncate to subattenuate to attenuate, of diverse lengths, unevenly distributed, and common. The stem is 76 - 92 × 4 - 5 mm, nearly cylindric or narrowing upward, creamy white, staining slightly brownish when bruised, and undecorated except for a slightly fibrillose-silky region near the bulb. The stem is firmly stuffed to nearly hollow. According to the illustration in the original description, the bulb is subabrupt and has some longtudinal splitting as in Amanita brunnescens G. F. Atk. The ring is creamy white to pale yellow, pendant, attached near the top of the stem, skirt-like, membranous, and collapsing against the stem. The volva is present on the globose bulb as a narrow free margin and is yellowish white to creamy white and submembranous. The odor is of old potatoes. According to the original description, the spores measure (6.6-) 7.2 - 9.0 µm long and are globose to subglobose and amyloid. Clamps are absent at bases of basidia. Jenkins (1986) reported spore measurements as follows: 6.1 - 9.2 × 6.6 - 9.0 µm. This species was originally described from Nova Scotia, Canada. It occurs solitarily under eastern hemlock (Tsuga canadensis). RET believes that he has collected this species in the United States north and east of West Virginia. The US material is macroscopically identical with the original description of A. solaniolens; and the holotype of the present species is presently on loan in our lab, but has not been fully revised. With this caveat we here supply the spore data from our collections which suggest a broader range of shape than is indicated by the original description: 7.0 - 8.8 (-10.5) × (5.5-) 6.5 - 8.0 (-9.5) µm, are globose to subglobose to broadly ellipsoid, rarely ellipsoid. For those persons familiar with RET's regional keys and the checklists produced at forays in the northeastern USA, previously collected material has been called "Amanita sp. N20" ("NE20" in Northeast Micological Foray checklists). We concur with the authors' choice of A. brunnescens as the species most similar to the present one. The former is distinguished by its size, its variable cap coloration, its lack of yellow pigment in the stem ring and volva, the more copious stem ring, and the strong brown staining reactions for which it is named. -- R. E. Tulloss and L. Possiel
[ Section Validae page. ]
[ Amanita Studies home. ]
[ Keys & Checklist/Picturebooks ] Last changed 24 January 2009. |