name | Amanita inopinata |
name status | nomen acceptum |
author | D. A. Reid & Bas |
english name | "Unexpected Guest Lepidella" |
images | |
cap | In the original description of this species (Reid, 1987), it was said to resemble a Strobilomyces species—not a common comment about an Amanita! The cap of A. inopinata is 25 - 80 mm wide, convex or applanate, finally shallowly concave with a downward curved margin, entirely covered with a thick, cottony, pale gray-brown felt which disrupts into very prominent darker pyramidal warts. The flesh is white. |
gills | The gills are rounded at the margin and (at least at times) salmon colored. |
stem | The stem is 45 - 70 × 4 - 19 mm, cylindric to slightly enlarged below before tapering to a rooting base, with the lower portion at first densely spotted with very dark gray to almost black floccose scales (volva), soon disappearing, leaving the lower part of the stem densely flecked with delicate, dark blackish brown, hair-like fibrils with recurved tips on a dirty salmon to bright tawny background, finally passing into blackish gray-brown. The volva may also be present as irregular bands of gray to nearly back material on the stem. |
spores | The spores measure 8 - 9 × 6 - 7 µm (Reid, 1987) and are strongly amyloid and subglobose to ovate, broadly ellipsoid, ellipsoid, or pip-shaped. Clamps are present at bases of basidia. Bas' measurement of spores from some of the original material were (8.7-) 9.2 - 10.2 (10.8) × 6.0 - 8.8 µm. Ridley (1991) reported spores (7.5-) 8 - 9 (-10) × (5.5-) 6 - 7.5 (-8) µm from poorly preserved material. |
discussion |
Amanita inopinata, a very unusual species of Amanita subsect. Vittadiniae Bas, was originally described from England, where it was found associated with both native and non-native trees (Acer, Aesculus, Chamaecyparis, Fraxinus, Ilex, Picea, Taxus, and Ulmus (dead)). In some cases, none of the woody plants recorded for a site are known to form ectomycorrhizae. Since that time, the present species has been found repeatedly in England and, more recently, in the Netherlands (e.g., in early November, 2000). There is great curiosity as to where this strange species could have originated. At present, it seems most likely to have come from New Zealand. It is known to occur in New Zealand. G. S. Ridley (1991) described it from that country without giving it a name because of lack of information on anatomy due to poor quality of the dried specimens. Ridley thought the species might have been imported from Europe or North America as it occurred "under Chamaecyparis sp., Cupressus macrocarpa and (?)Pinus sp."< While it is clear that this species belongs in subsection Vittadiniae, there seems to be no proper home for it among the stirpes that Bas described within that subsection. I suggest that it be placed in a new stirps Inopinata.—R. E. Tulloss |
brief editors | RET |
name | Amanita inopinata | ||||||||||||||||
author | D. A. Reid & Bas in D. A. Reid. 1987. Notes Roy. Bot. Gard. Edinburgh 44: 506, figs. 2(a-b), 3(a-c) | ||||||||||||||||
name status | nomen acceptum | ||||||||||||||||
english name | "Unexpected Guest Lepidella" | ||||||||||||||||
MycoBank nos. | 133153 | ||||||||||||||||
GenBank nos. |
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holotypes | K | ||||||||||||||||
intro |
The following text may make multiple use of each data field. The field may contain magenta text presenting data from a type study and/or revision of other original material cited in the protolog of the present taxon. Macroscopic descriptions in magenta are a combination of data from the protolog and additional observations made on the exiccata during revision of the cited original material. The same field may also contain black text, which is data from a revision of the present taxon (including non-type material and/or material not cited in the protolog). Paragraphs of black text will be labeled if further subdivision of this text is appropriate. 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. Information from the protolog is included below and is so marked. Ridley (1991) treated this species under the name "Amanita species 1." Information from Ridley's description is included below and is so marked. from Ridley (1991): Basidiomes medium-sized. | ||||||||||||||||
pileus |
protolog: 25 - 80 mm wide, entirely covered by universal veil, convex or applanate, finally shallowly concave; context white, with prominent gray band below universal veil; margin downcurved; universal veilat first as thick gray-brown cottony felt, disrupting into prominent darker pyramidal warts up to 5 mm high. Ridley (1991): 50 - 85 mm wide, convex to plano-convex, then plano-depressed, grayish sepia to fuscous; context white, grayish beneath universal veil; margin not described; universal veil as blunt, pyramidal warts to 1.5 mm high or scab-like scales (becoming smaller and floccose towards margin), fuscous, occasionally with pale edges | ||||||||||||||||
lamellae |
protolog: attachment & frequency not described, salmon, up to 10 mm wide, rounded at margin; lamellulae not described. from Ridley (1991): free, crowded, white then “creamy white,” possibly with “pale pink” to “pale apricot” tints, 6 - 9 mm broad; lamellulae truncate. | ||||||||||||||||
stipe |
protolog: 45 - 70 × 4 - 18 mm, base color pale pinkish salmon in upper part and below shading (downward) from dirty salmon to bright tawny to (on the rooting base) blackish gray-brown, cylindric to slightly narrowing upward, below partial veil in young basidiomes at first densely spotted with very dark gray to almost black scales that soon disappear, then densely flecked with delicate dark blackish brown hair-like fibrils with recurved tips; bulb as tapering radical; context white in upper stipe becoming cream or pale salmon below; partial veil closely appressed, "seemingly" sheathing, pale gray, darkening downward to narrow black free edge, with age portion above edge disrupting in zigzag bands of scales; universal veil [not reported as such, put probably comprising detersile material described on lower stipe]. Ridley (1991): 38 - 80 × 4 - 20 mm, clavate, with rounded to slightly radicating base, above annular zone powdery striate and “grayish” to “lilac gray,” below annular zone bearing apically free “dark gray” fibrils or volval remnants forming bands, at base white to sordid white; context white, sometimes turning slightly “yellowish” or “apricot” on exposure, solid. | ||||||||||||||||
odor/taste | neither recorded. | ||||||||||||||||
macrochemical tests |
none reported. | ||||||||||||||||
pileipellis | probably absent or poorly defined—ed. | ||||||||||||||||
pileus context | not described. | ||||||||||||||||
lamella trama | protolog: bilateral, distinctly divergent; central stratum pronounced, rather dense, with frequent sigmoid vascular hyphae; subhymenial base comprising filamentous hyphae up to 18 μm wide, with inflated cells apparently absent. | ||||||||||||||||
subhymenium | protolg: "irregularly cellular." | ||||||||||||||||
basidia |
protolog: Per Reid: 43 - 56 μm, clavate or lanceolate, 2- or 4-sterigmate; clamps present. Per Bas: 46 - 56 (-64) × 11 - 13 μm, dominantly 2-, also 1-, 3-, and 4-sterigmate, Ridley (1991): not observed, with basidioles 29 - 35.5 × 9 - 10.5 μm; clamps present. | ||||||||||||||||
universal veil |
protolog: On pileus: filamentous hyphae not described; inflated cells in base periclinally aligned, otherwise ascending and interweaving (especially densely interweaving near wart apices, in apical part 60 - 140 × 35 - 60 μm, narrower below and there elongated (subcylindrical to subfusiform) 70 - 280 × 8 - 56 μm; vascular hyphae not described; clamps not described. Ridley (1991): On pileus: inflated cells abundant, globose to ellipsoid to clavate, umber, 51 - 166 × 17 - 58 μm, with filamentous hyphae to 13.0 μm wide, clamped, with elements having anticlinal orientation. | ||||||||||||||||
stipe context | protolog: longitudinally acrophysalidic; filamentous hyphae 3 - 15 μm wide, plentiful, branching; acrophysalides up to 280 × 41 μm; vascular hyphae absent or inconspicuous; clamps not described. | ||||||||||||||||
partial veil | not described. | ||||||||||||||||
lamella edge tissue | Undoubtedly sterile—ed. | ||||||||||||||||
basidiospores |
protolog: Per Bas' measurements: [-/-/-] (8.7-) 9.2 - 10.2 (-10.8)× 6 - 8.8 (-9.2) μm, (est. Q = 1.16 - 1.53; est Q' = 1.31), hyaline, thin-walled, strongly amyloid, broadly ellipsoid to ellipsoid. [Note: Estimated values of Q are provided in order to generate an approximate sporograph. Reid noted that spore length could vary up to 12 μm in cases in which 2-sterigmate basidia were present in the hymenium.—ed.] Ridley (1991): [42/3/-] (7.5-) 8.0 - 9 9 (-10.0) × (5.5-) 6.0 – 7.5 (-8.0) um, (Q = (1.12-) 1.20 – 1.50; Q' = 1.31), hyaline, amyloid, occasionally subglobose, usually broadly ellipsoid; apiculus not described; contents not described; creamy in deposit. RET: ??. | ||||||||||||||||
ecology |
protolog: Under Picea sitchensis at edge of plantation and also under dead Ulmus sp. or under old Aesculus hippocastanum (with Acer pseudoplatanaus and Ilex aquifolium) or under Chamaecyparis lawsoniana or under Taxus. Ridley (1991): Under Chamaecyparis sp., Cupressus macrocarpa and (?) Pinus sp. Known from Lincoln and Auckland City in New Zealand. RET: U.K.: Under old Aesculus hippocastanum, with Acer pseudoplatanus and Ilex aquifolium nearby. Netherlands: In loam under Fraxinus. | ||||||||||||||||
material examined |
protolog: U.K.:
ENGLAND—Essex - Chigwell, Broad Oaks,
Ridley (1991): NEW ZEALAND: AUCKLAND—Auckland City, Domain, 16.iv.1972 M. Taylor s.n. [G. M. Taylor 726] (??); Auckland City, Cornwall Park, One Tree Hill, 25.vi.1964 B. P. Segedin 455 (??). CANTERBURY—Lincoln, Lincoln College, 10.vi.1971 W. A. Jermyn s.n. (PDD 31281). RET: NETHERLANDS: ZUID HOLLAND—Hazerswoude, | ||||||||||||||||
discussion | Ridley (1991): “The watercolor of Taylor 726 depicts a black basidiome with salmon or apricot lamellae, whereas the other two specimens are described as brownish with white to creamy lamellae.” | ||||||||||||||||
citations | —R. E. Tulloss | ||||||||||||||||
editors | RET | ||||||||||||||||
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name | Amanita inopinata |
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name | Amanita inopinata |
bottom links |
[ Section Lepidella page. ]
[ Amanita Studies home. ]
[ Keys & Checklists ] |
Each spore data set is intended to comprise a set of measurements from a single specimen made by a single observer; and explanations prepared for this site talk about specimen-observer pairs associated with each data set. Combining more data into a single data set is non-optimal because it obscures observer differences (which may be valuable for instructional purposes, for example) and may obscure instances in which a single collection inadvertently contains a mixture of taxa.