The cap of A. chiricahuana is 54 - 120 mm wide, gray with faint brown to olivaceous brown tint to brownish-gray to pale brownish gray, sometimes white just at margin, unchanging when cut or bruised, irregular to subhemispheric at first, finally convex. The cap's flesh is white to whitish to pale cream except for a grayish region (up to 5 mm thick) under the cap skin in the center or mostly gray with a whitish region above the gills and near the top of the stipe, and unchanging when cut or bruised. The cap's margin is striate (with striations occupying one-tenth to one-fifth of the cap's radius; occasionally the ridges between the grooves are decorated small fine bumps. Remnants of the volva may be present as a large patch or patches that are white and occasionally have yellow or yellow-tan splotches and stains or become pale grayish white to brownish gray with age, unchanging when cut or bruised. Such patches are soft and cottony at first, up to 1.5 mm thick, have a somewhat felt-like surface (10× lens) in age, and can often be easily removed.
The gills are free to narrowly attached, with faint (10× lens) to distinct (and then rather long) attached lines descending the top of the stem. The gills are crowded, off-white to cream to faintly orangish cream to sordid cream to very pale gray in mass and become more grayish at maturity and in areas damaged by insects. Forking and reverse forking of gills is rather common in some specimens. The short gills are truncate to subattenuate, of diverse lengths, infrequent in some sectors, occasionally apparently absent (but then gill forking is more common), often common to plentiful, originating at stipe occasionally, and occasionally attached to neither stipe nor margin. )ccasionally almost all the short gills are interconnected with adjacent full-sized gills to form a nearly poroid hymenium .
The stem is 44 - 114 × 12.5 - 20 mm, white to very pale grayish white with a powdery to chalky surface, becoming brownish gray to gray when handled or in age, sometimes bearing minutel fibrils on the lower part (and then the fibrils becoming brownish gray when touched or in age), subcylindric or narrowing upward or downward, flaring at the top of the stem or not. The flesh of the ringless stem is white to off-white, unchanging when cut or bruised.nbsp; There is a saccate volva at the stem base; it is white on both the exterior and interior surfaces, with some ochraceous stains on the exterior of the stem base. The volva is soft, cottony on the exterior, membranous, sometimes graying in its upper part with age, and attached to the stem base for one-third to one-half of the height of the sack.
Odor is usually lacking or indistinct, but is reported occasionally as "sourish," and can be unpleasant in age. Taste is lacking.
The spores measure (9.5-) 10.2 - 13.2 (-14.0) × (8.5-) 9.0 - 11.8 (-13.0) µm and are globose to subglobose to broadly ellipsoid and inamyloid. Clamps are probably not found at the bases of basidia.
Occurrence with at least four species of Pine (Pinus), Fir (Picea), and Douglas Fir (Pseudotsuga menziesii) is reported at altitudes from 2400 to 3200 m.
This mushroom is presently known only from one site in Colorado and from several sites in the Chiricahua Mountains of Arizona, but it may be present in similar habitats in the southwestern states of the U.S. and in similar montane habitat in Mexico.
Tulloss nom. prov.
"Chiricahua Ringless Amanita"
Chiricahua + -ana, suffix indicating possession; hence, "of the Chiricahua"
For the Chiricahua Mountains, commemorating the Chiricahua Mycoflora Project, and honoring the Chiricahua Apaches for whom the mountains were named.
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The following is based on original research of R. E. Tulloss.
54 - 120 mm wide, gray with faint umbrinous tint to brownish-gray to pale brownish gray, sometimes white just at margin, unchanging when cut or bruised, irregular to subhemispheric at first, then convex, finally plano-convex with broad low umbo, sometimes developing concentric ridges (CMP1333), tacky to dry, shiny; context white to whitish to pale cream except for grayish region (up to 5 mm thick) in disc or mostly gray with whitish region above lamellae and near the stipe apex, with or without watery line above lamellae, unchanging when cut or bruised, 3.5 - 17 mm thick at stipe, thinning evenly to margin or to within 4 - 10 mm of margin and then membranous to margin; margin striate (0.1 - 0.25R), occasionally tuberculate in outermost 4 - 5 mm (CMP1333), nonappendiculate; universal veil as large patch or patches, white, occasionally with ochraceous or yellow-tan splotches and stains (CMP1333) or becoming pale grayish white (8-16-97-A[, CMP1818]) to brownish gray (CMP1346) in age, unchanging when cut or bruised, membranous and sometimes leathery or (in age) submembranous (CMP1346), soft and cottony at first, up to 1.5 mm thick, with subfelted surface (lens) in age (CMP1346), detersile.
receding to free to narrowly adnate, with faint (lens) to distinct (and then rather long) decurrent lines on stipe, crowded, off-white to cream to faintly orangish cream to sordid cream to very pale gray in mass, off-white to pale cream to sordid cream to very pale grayish white in side view, becoming more sordid at maturity and in areas damaged by insects, 4 - 8 mm broad, broadest about 0.75R from stipe to margin, sometimes with minute white flocculence (lens) on edge, with forking and reverse forking rather common in some specimens (8-16-97-A, CMP1333, CMP1346); lamellulae truncate to subattenuate, of diverse lengths, infrequent in some sectors, occasionally apparently absent (CMP1333) but then forking more common, often common to plentiful, originating at stipe occasionally, occasionally attached to neither stipe nor margin, occasionally almost all anastomosing with lamellae to form nearly poroid hymenium (CMP1333).
44 - 114 × 12.5 - 20 mm, white to very pale grayish white with pulverulent to chalky surface, becoming brownish gray to gray when handled or in age, sometimes minutely fibrillose to fibrillose in lower portion (and then fibrils becoming brownish gray when touched or in age), sometimes with surface splitting into recurved scales (especially in lower third), subcylindric or narrowing upward or downward, flaring at apex or not, finely longitudinally striatulate (becoming more pronouncedly striate in age), sometimes with slight swelling at base (8-16-97-A, CMP1346); context white to off-white, unchanging when cut or bruised, concolorous to sordid ochraceous to watery tan in larva tunnels, firmly [occasionally in age somewhat loosely (CMP1818)] stuffed with white cottony fibrils, with central cylinder 5 - 12 mm wide; exannulate; universal veil as saccate volva, white on both exterior and interior surfaces, with some ochraceous stains on exterior of base, soft, cottony on exterior, membranous, sometimes graying in upper part of limb with age, up to 1.5 mm thick at midpoint between point of attachment to stipe and highest point on limb, distance from base of stipe to highest point of limb 26 - 37 mm, up to 34 mm wide, often breaking into uneven (sometimes subtriangular) limbs adnate to stipe base for one third to one half their lengths, with limbus internus small and placed near point of attachment (8-16-97-A, CMP1346), sometimes with upstanding fine fibrils on top, often becoming obliterated with age.
Odor lacking or indistinct, occasionally sourish (CMP1333), sometimes unpleasant in age (CMP1346). Taste lacking.
Syringaldazine spot test for laccase - positive within 2 min. in spots in context of stipe base and interior of universal veil, eventually positive throughout universal veil interior (including most pileal warts) and base of stipe in both immature and mature specimens and, in mature material, often on surface of lower stipe and on surfaces of lower half of central cylinder of stipe or in context of lower stipe. Paracresol spot test for tyrosinase - strongly positive in 1± min. in stipe base (then quicklly positive in entire stipe context), interior of volval limb, stipe surface, and pileipellis; eventually positive throughout basidiome except for pileus context under disc and some spots on lamellae. Chemical test voucher: CMP1818, Tulloss 8-16-97-A.
[60/3/3] (9.5-) 10.2 - 13.2 (-14.0) × (8.5-) 9.0 - 11.8 (-13.0) µm, (L = 11.6 -11.8 µm; L’ = 11.7 µm; W = 10.3 - 10.8 µm; W’ = 10.5 µm; Q = (1.03-) 1.04 - 1.20 (-1.25); Q = 1.09 - 1.14; Q’ = 1.11), hyaline, colorless, ??-walled, smooth, inamyloid, globose to subglobose to broadly ellipsoid, ?? adaxially flattened, ?? expanded at one end; apiculus sublateral, short, sometimes rather broad, up to 1.0 × 1.2 µm, usually cylindric, occasionally truncate-conic; contents monoguttulate with or without additional small granules to multiguttulate; white in deposit.
Arizona: Solitary to subgregarious, from 2420 to 2570 m elev. Under Pinus arizonica in sand and rocks beside jeep trail or with Pseudotsuga menziesii, Pinus discolor, P. chihuahuana in rocks and sand of jeep trail or under P. engelmannii. Colorado: Subgregarious, at 3200± m elev. Under Picea engelmannii.
ARIZONA—Cochise Co. - CMP site #5, 19.viii.1992 R. E. Tulloss 8-19-92-K [CMP1333] (LAM; RET); CMP site #6, 19.viii.1992 R. E. Tulloss 8-19-92-W [CMP1341] (LAM; RET); CMP site #46, 21.viii.1992 S. B. Fleming s.n. [CMP1346 ; Tulloss 8-21-92-S] (LAM; RET), F. H. Nishida s.n. [CMP1818 ; Tulloss 8-21-92-X] (LAM; RET), W. J. Sundberg s.n. [CMP1835 ; Tulloss 8-21-92-ADa] (LAM; RET); 22.viii.1994 S. B. Fleming s.n. [CMP3302 ; Tulloss 8-22-94-A] (LAM; RET).
COLORADO—Summit Co. - Holy Cross View, 16.viii.1997 M. Horman s.n. [Tulloss 8-16-97-A] (DBG; F; RET).
This species was formerly called Amanita sp. AZ23 in manuscripts, checklists, and keys circulated by RET.
—R. E. Tulloss
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