name | Amanita cinereoconia var. cinereoconia |
name status | nomen acceptum |
author | G. F. Atk. |
english name | "American Gray Dust Lepidella" |
images | |
cap | The cap of Amanita cinereoconia is 30 - 70 mm wide, from convex to expanding to flat or plano-convex, whitish to grayish, dry, with nonsulcate, appendiculate margin. The cap is covered with pale yellowish gray, brownish gray or pale umber, pulverulent-subflocculose, easily removable layer of volva tending to form small, more or less pulverulent wars, especially at the center. |
gills | The gills are rather crowded to subdistant, free to slightly adnate, moderately broad, and white to pale cream. The short gills are rounded-truncate to attenuate. |
stem |
The stem is 50 - 100 × 4 - 9 mm, equal or tapering upward, solid, white, and usually exannulate. The volva is pulverulent-flocculose, rarely forming an inconspicuous, imperfect, cottony rim at the top of the bulb. |
spores | Bas reports the spores to measure 8.5 - 11.5 (-12.5) × (4.5-) 5 - 6.5 µm and are elongate to cylindric (rarely ellipsoid, sometimes bean shaped) and amyloid. Clamps are absent at bases of basidia. RET found the spores of two collections to measure (7.3-) 8.0 - 10.1 (-11.2) × (3.8-) 4.2 - 5.2 (-6.3) µm and to be elongate to cylindric. |
discussion |
Amanita cinereoconia is known from mixed (coniferous and deciduous) forests from the U.S. states of North Carolina, Tennessee, Virginia, and West Virginia according to Jenkins (1986). Bas (1969) based his stirps Cinereoconia on A. cinereoconia and included the following taxa in addition: A. griseofarinosa Hongo (described from Japan), A. lutescens Hongo (described from Japan), A. odorata Beeli (described from central Africa), A. pelioma Bas (described from the southeastern USA), and A. vestita Corner and Bas (described from SE Asia).—R. E. Tulloss |
brief editors | RET |
name | Amanita cinereoconia var. cinereoconia | ||||||||
author | G. F. Atk. 1909. Ann. Mycol. 7: 366. | ||||||||
name status | nomen acceptum | ||||||||
english name | "American Gray Dust Lepidella" | ||||||||
synonyms |
≡Lepidella cinereoconia (G. F. Atk.) E.-J. Gilbert & Kühner. 1928. Bull. Trimestriel Soc. Mycol. France 44: 151.
≡Armillaria cinereoconia (G. F. Atk.) Locq. 1952. Bull. Trimestriel Soc. Mycol. France 68: 167.
≡Aspidella chlorinosma f. cinereoconia (G. F. Atk.) E.-J. Gilbert. 1940. Iconogr. Mycol. (Milan) 27, suppl. (1): 79, tab. 58 (fig. 4).
≡Amanita chlorinosma f. cinereoconia (G. F. Atk.) E.-J. Gilbert. 1941. Iconogr. Mycol. (Milan) 27, suppl. (2): 395, tab. 66. [Misapplied to Amanita onusta (Howe) Sacc.] The editors of this site owe a great debt to Dr. Cornelis Bas whose famous cigar box files of Amanita nomenclatural information gathered over three or more decades were made available to RET for computerization and make up the lion's share of the nomenclatural information presented on this site. | ||||||||
etymology | cinereus "ash gray" + κονια (Grk.) "dust" | ||||||||
MycoBank nos. | 356779, 345946, 292692 | ||||||||
GenBank nos. |
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holotypes | CUP-A | ||||||||
type studies | Jenkins. 1982. Mycotaxon 14: 240. | ||||||||
revisions | Bas. 1969. Persoonia 5: 463, figs. 209-214. | ||||||||
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. The following material is based on original research by R. E. Tulloss except as otherwise noted in the text. | ||||||||
pileus | 33 - 75 mm wide, gray or pale brownish gray over disc and paler toward margin, unchanging when cut or bruised, hemispheric at first, then convex, finally planoconvex, sometimes depressed in center, tacky, dull; context white to off-white, unchanging when cut or bruised, 3 - 5 mm thick over stipe, thinning evenly to margin; margin nonstriate, appendiculate with white floccose or floccose-fibrillose material in patches or icicle-like; universal veil in thin patches or warts or pulverulent layer, brownish gray, unchanging?? with age or exposure, very finely verruculose, sometimes with pyramidal warts over disc, detersile. | ||||||||
lamellae | free to narrowly adnate without decurrent line on stipe apex, close to subcrowded, cream in mass, cream to white in side view, 3.5 - 10 mm broad, with floccose-fibrillose white edge; lamellulae rounded truncate to attenuate after a step to subattenuate to attenuate, in at least two tiers. | ||||||||
stipe | 41 - 113 × 7 - 9.5+ mm, white to pale grayish white, becoming pale tan from handling, narrowing upward, gradually expanding near apex or not at all, decorated with fine grayish pulverulence or finely flocculose-fibrillose material; bulb ovoid to fusiform, subradicating, sometimes dog-legged, 22± × 14 - 20 mm, sometimes with layer of grayish pulverulence above broadest point; context solid, white to whitish to cream, unchanging when cut or bruised, with larva tunnels concolorous to faintly tan; partial veil subapical, reduced to torn submembranous fragments (striate above) and flocculent or floccose-fibrillose zone, white; universal veil not evident or as irregular scattered crudely concentric partial rings from base of stipe to midheight of bulb, whitish. | ||||||||
odor/taste | Odor “chloride of lime” or faintly of “chlorine.” Taste not recorded. | ||||||||
macrochemical tests |
Spot test for laccase (syringaldazine) - negative throughout basidiome. Spot test for tyrosinase (paracresol) - negative throughout basidiome. Test vouchers: Tulloss 10-25-86-D, 7-17-87-F. | ||||||||
pileipellis | from Bas (1969): filamentous hyphae 2 - 8 μm wide, colorless, interwoven to subradially arranged, mostly not gelatinizing, may be slightly gelatinized (at surface only) over disc. | ||||||||
lamella trama | from Bas (1969): bilateral; "with elements up to 12 μm wide"; vascular hyphae present. | ||||||||
subhymenium | from Bas (1969): rather thick, subramose to rather irregularly cellular. | ||||||||
basidia | from Bas (1969): 35 - 55 × 8 - 10 μm, 4-sterigmate; clamps lacking. | ||||||||
universal veil | from Bas (1969): On pileus: filamentous hyphae very thin-walled, 3 - 7 μm wide, ascending over disc; inflated cells rather small, subglobose or ellipsoid or pyriform or clavate, often brownish, above base up to 60 × 50 μm or (rarely) 80 × 60 μm, near base occasionally elongate (up to 180 × 20 μm) or inflated-branching, on pileus limb loosely arranged and probably in ascending rows, over disc in denser parallel erect rows; vascular hyphae lacking. On stipe base: comprising scattered globose to pyriform to clavate cells. | ||||||||
stipe context | from Bas (1969): longitudinally acrophysalidic. | ||||||||
lamella edge tissue | from Bas (1969): consisting mainly of colorless, globose to pyriform cells 15 - 45 μm wide, partly in chains. | ||||||||
basidiospores |
Bas (1969): [40/5/5] 8.5 - 11.5 (-12.5) × (4.5-) 5.0 - 6.5 µm, (Q = (1.40-) 1.60 - 2.0 (-2.3); Q = 1.70 - 1.90). from type study of Jenkins (1982): [-/-/1] 7.8 - 10.9 × 4.7 - 6.2 μm, (Q = 1.66 - 1.76; Q' = 1.72), hyaline, thin-walled amyloid, elongate; apiculus sublateral, cylindric; contents guttulate; color in deposit not recorded. composite data from material revised by RET: [80/4/4] (7.3-) 7.7 - 10.1 (-11.2) × (3.8-) 4.2 - 5.8 (-6.4) µm, (L = 8.8 - 9.5 µm; L’ = 9.1 µm; W = 4.2 - 5.5 µm; W’ = 4.9 µm; Q = (1.52-) 1.55 - 2.17 (-2.49); Q = 1.69 - 1.97; Q’ = 1.85), hyaline, colorless, smooth, thin-walled, amyloid, elongate to cylindric, sometimes slightly constricted or slightly curved, sometimes expanded at one end, adaxially flattened or depressed; apiculus sublateral, cylindric, proportionately small; contents guttulate; ?? in deposit. | ||||||||
ecology | Solitary. Mississippi: In mixed forest with Pinus and hardwoods. Texas: In sandy soil of mixed forest including Pinus taeda and hardwoods. | ||||||||
material examined |
Bas (1969): U.S.A.: NORTH CAROLINA—Orange Co. - Chapel Hill, Battle's Pk., 21.ix.1908 W. C. Coker s.n. (holotype, CUP 22628). Macon Co. - Highlands, 7.viii.1938 W. C. Coker 10873 (NCU), 19.viii.1938 L. Stewart 10950 (NCU, 21.viii.1943 W. C. Coker 13518 (NCU).
VIRGINIA—Giles Co. - Mountain Lk., 17.viii.1941 L. R. Hesler 13976 (TENN). Jenkins (1982): U.S.A.: NORTH CAROLINA—Orange Co. - Chapel Hill, Battle's Pk., 21.ix.1908 W. C. Coker s.n. (holotype, CUP 22628). U.S.A.: MISSISSIPPI—Perry Co. - Black Creek Tr., 17.vii.1987 Huffman s.n. [Tulloss 7-17-87-F] (RET ??). TENNESSEE—Blount Co. - GSMNP, Abram Crk. Tr., beyond camping area, 17.vii.2006 R. E. Tulloss 7-17-06-A [Tenn. Field Book 13315] (TENN ??, yellowing syndrome; RET 582-3). Fentress Co. - Colditz Cove State Natural Area, 6.ix.2009 Jay Justice TN-AM-17 (RET 452-5; yellowing syndrome). TEXAS—Hardin Co. - Big Thicket Nat. Pres., Jack Gore Baygall Unit, 25.x.1986 D. P. Lewis s.n. [Tulloss 10-25-86-D] (RET 467-7). Polk Co. - Big Thicket Nat. Preserve, unkn. loc., 23.ix.2009 Ron Pastorino 9-23-09G [mushroomobserver.org #25870] (RET 473-2). Tyler Co. - Town Bluff, Farm to Mkt. Rd. 92, 30.v.1994 David P. Lewis 5213 (RET 285-7). | ||||||||
discussion |
t.b.d. Tulloss 7-17-06-A became yellow-staining after it was collected, but showed no signs of yellow staining in the field. In addition, its spores were normal for cinereoconia var. cinereoconia. From this evidence, RET believes that var. croceescens may be based upon specimens of A. cinereoconia with the yellowing syndrome. (See discussion under A. subsolitaria.) The recorded values of spore length, width, and Q—as well as the averages of these values—are probably depressed because of the number of specimens examined that exhibited the yellowing syndrome (for an example of this syndrome, see A. subsolitaria. Sporographs of this species are compare with those of A. onusta in the following figure: | ||||||||
citations | —R. E. Tulloss | ||||||||
editors | RET | ||||||||
Information to support the viewer in reading the content of "technical" tabs can be found here.
name | Amanita cinereoconia var. cinereoconia |
name status | nomen acceptum |
author | G. F. Atk. |
english name | "American Gray Dust Lepidella" |
images | |
photo |
B&W photo by L. R. Hesler (Tennessee, with permission of Dr. R. H. Petersen, L. R. Hesler Herbarium, Univ. of Tenn., Knoxville) |
name | Amanita cinereoconia var. cinereoconia |
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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.