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The following material is derived from original research by R. E. Tulloss.
207 – 229 mm wide, off-white to pale cream, yellow-tan with age, subglobose then hemispheric, becoming convex, dull and tacky becoming more viscid with age: context white, becoming pale yellow in disc, sometimes with watery line above gills, 17 - 26 mm thick, thinning evenly to margin; margin non-striate, appendiculate with 1± mm band of thin, irregularly serrate, floccose-felted, friable material; universal veil as large smooth warts or small patches (with sloping facets not conspicuously striate as in A. ravenelii), white with buff center, felted to subfelted, detersile, probably discoloring to brown when bruised.
free, without decurrent line on stipe, crowded, pale cream in mass, pale cream in side view, no bruising observed , 11.5 – 21 mm broad, with white flocculose edge, with forking common near margin; lamellulae truncate, unevenly distributed, of diverse lengths, plentiful, attached to stipe or margin or neither (with many in each of these categories).
63 – 67 × 28 - 33 mm, white, no bruising observed, narrowing slightly upward, not flaring at apex in younger specimen; bulb 54± × 51 – 63 mm, broadly fusiform or broadly napiform or subnapiform, with thick white cord-like pseudorrhizae originating from center of bulb's bottom; context white with some watery streaks, turning pale yellowish when bruised, stuffed with firm and somewhat amorphous white material (i.e., not with fibrils having definite orientation), with no larval tunnels observed; partial veil superior, covering almost entire stipe, floccose-felted, with thickened serrate edge standing out from stipe, otherwise appressed; universal veil with upper portion distinctly cothurnate and white, with additional rings on upper bulb surface (1-3) breaking up into warts and becoming pale buff.
Odor fruity and pleasant in partially expanded "button." Taste not recorded.
Spot test for laccase (syringaldazine) - negative throughout the basidiome. Spot test for tyrosinase (paracresol) - in youngest specimen, rapidly positive throughout basidiome except for region where tissues of pileus and stipe join; in oldest specimen, positive throughout basidiome except in disc of pileus, in region in which pileus and stipe tissues join, and for the outermost few mm of stipe context and the outermost few mm of upper part of bulb context. Test voucher: Tulloss 8-12-97-MM.
filamentous undifferentiated hyphae, extensively interwoven and gelatinized at surface; vascular hyphae, 7.5 - 12.5 μm wide, branching, common, intensely yellow to yellow-orange to yellow-brown.
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On pileus, upper part of wart: generally with tissue extensively collapsed; filamentous, undifferentiated hyphae ?? μm, branching, plentiful; inflated cells common to plentiful, subglobose (e.g., 33 × 32 μm) to ellipsoid (e.g., 38 × 28 μm) to clavate; vascular hyphae 2.5 - 3.0 μm wide, sordid pale yellow. On pileus, base of wart: not appearing strongly fibrillose. From wart on stipe base: filamentous undifferentiated hyphae 1.1-8.0 μm wide, branching, common, fasciculate, with thin to slightly thickened walls; inflated cells faintly yellowish, with walls 0.5 - 1.0 μm thick, globose (e.g., 53 × 53 μm) to subglobose (e.g., 60 × 57 μm) to subellipsoid (e.g., 38 - 51 × 32-43 μm) to clavate; vascular hyphae ?? μm wide, ??; clamps large and common.
In the field, the spores in Melzer's reagent were considered "weakly amyloid"; but re-examination in the lab does not support this observation—they are inamyloid. The fact that yellow pigment was developing below the pileipellis in the disc as the specimens matured and that cells within the universal veil appeared yellow when fresh, combined with the distribution of the limbus internus on the robust basidiomes suggest that the collection at the very least belongs in stirps Muscaria if it is not assignable to A. muscaria subsp. flavivolvata as a pallid color variant.
In the following figure, sporographs of the present material and that of the last-named species are compared.
The original notes of the anatomy of the present collection were made while traveling using borrowed microscopes. RET extends his thanks to Anna Gerenday and Marilyn Shaw for their generosity in allowing him the use of their scopes.
—R. E. Tulloss
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Spore data for collections provisionally identified as: Amanita sp-WY01 Tulloss
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