| name | Amanita magna |
| name status | nomen provisorum |
| author | Lamoureux |
| english name | "Lamoureux's Great Ringless Amanita" |
| intro | The information below is derived from (Lamoureux 2006) and original research of RET. |
| cap | The cap of A. magna is 80 - 140 mm wide, with more or less irregular concentric zones (alternating tan-gray and blackish, usually blackish over disc and in narrow zone overlapping inner ends of marginal striations). The cap is ovoid at first, then rounded conic, and finally planar with a central umbo. Its flesh is white. The cap has long radial grooves occupying about half of the cap's radius. No volval material is present on the cap. |
| gills | The gills of this species are described as "whitish" or "grayish," sometimes have a blackish margin. |
| stem | The ringless stem of A. magna is 200 - 300 × 10 - 20 mm; its ground color is white; and it narrows upward. The stem is decorated in its upper 60±% with a zebroid pattern of fibrils colored like the lighter zones on the cap. The stem flesh is white. A membranous, persistent, saccate volva encloses the stem's base. The sack is white on the exterior and measures (for example) 47 × 22 mm. |
| odor/taste | There is no distinct odor for this species. No taste is recorded. |
| spores | The spores of Amanita magna measure 9.5 - 11.8 (-13.4) × (8.5-) 9.0 - 11.0 (-12.4) μm and are globose to subglobose and inamyloid. Clamps are absent from bases of basidia. |
| discussion | —Y. Lamoureux and R. E. Tulloss |
| brief editors | RET |
| name | Amanita magna | ||||||||||||||||||||
| author | Lamoureux nom. prov. 2006. Champignons due Québec 2: 48, fig. 13. | ||||||||||||||||||||
| name status | nomen provisorum | ||||||||||||||||||||
| english name | "Lamoureux's Great Ringless Amanita" | ||||||||||||||||||||
| GenBank nos. |
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| intro |
Olive text indicates a specimen that has not been thoroughly examined (for example, for microscopic details) and marks other places in the text where data is missing or uncertain. The following material is derived from (Lamoureux 2006) and from original research of R. E. Tulloss. The photograph (fig. 13) of the present species in (Lamoureux 2006) was used to supplement Lamoureux's written description. | ||||||||||||||||||||
| pileus | Lamoureux (2006): 80 - 140 mm wide, with more or less irregular zones (alternating tan-gray and blackish, usually blackish over disc and in narrow zone overlapping inner ends of marginal striations), ovoid at first then rounded conic finally planar with central umbo; context white; margin nonappendiculate, long-striate (0.45 - 0.5R); universal veil absent. | ||||||||||||||||||||
| lamellae | Lamoureux (2006): white or grayish, sometimes with blackish edge. | ||||||||||||||||||||
| stipe | Lamoureux (2006): 200 - 300 × 10 - 20 mm, with ground color white, narrowing upward, decorated in upper 60±% of stipe with zebroid pattern of fibrils concolorous with lighter zones of pileus, undecorated in bottom 40±%; context white; exannulate; universal veil as saccate volva, membranous, persistent, white on exterior, 47± × 22± mm. | ||||||||||||||||||||
| odor/taste | Lamoureux (2006): Odor indistinct. Taste not recorded. | ||||||||||||||||||||
| macrochemical tests |
none recorded. | ||||||||||||||||||||
| pileipellis | t.b.d. | ||||||||||||||||||||
| pileus context | t.b.d. | ||||||||||||||||||||
| lamella trama | t.b.d. | ||||||||||||||||||||
| subhymenium | t.b.d. | ||||||||||||||||||||
| basidia | t.b.d. | ||||||||||||||||||||
| universal veil | On pileus: absent. On stipe base: t.b.d. | ||||||||||||||||||||
| stipe context | t.b.d. | ||||||||||||||||||||
| partial veil | absent. | ||||||||||||||||||||
| lamella edge tissue | sterile; t.b.d. | ||||||||||||||||||||
| basidiospores |
Lamoureux (2006): 9.5 - 13.5 × 8.5 - 12 μm, inamyloid, subglobose to ellipsoid. RET: [40/1/1] 9.5 - 11.8 (-13.4) × (8.5-) 9.0 - 11.0 (-12.4) μm, (L = 10.8 μm; W = 10.1 μm; Q = (1.03-) 1.04 - 1.12 (-1.15); Q = 1.07), hyaline, colorless, smooth, thin-walled, inamyloid, globose to subglobose, at least somewhat adaxially flattened; apiculus sublateral, cylindric; contents mono- to multiguttulate, sometimes with additional small granules; white in deposit. | ||||||||||||||||||||
| ecology | Lamoureux (2006): Predominantly solitary, rarely found with more than three basidiomes in a group. Associated with Fagus. July to September. Rare, most frequently found to date in the environs of Québec City. | ||||||||||||||||||||
| material examined | CANADA: QUÉBEC—Île Jésus - Laval, 24.vii.1990 Y. Lamoureux 1028 (CMMF; RET 521-3). | ||||||||||||||||||||
| discussion | Lamoureux (2006) remarks that the present species differs from A. elongatior by the absence of yellow or olive pigmentation. Further, the zonate pileus and zebroid stipe decoration are noted to be constant characters. | ||||||||||||||||||||
| citations | Translation of (Lamoureux 2006) from French by RET, who is responsible for any errors.—R. E. Tulloss and Y. Lamoureux. | ||||||||||||||||||||
| editors | RET | ||||||||||||||||||||
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