| name | Amanita minnesorora | ||||||||||||||||||||||||||||
| author | Tulloss and Kudzma | ||||||||||||||||||||||||||||
| name status | nomen provisorum | ||||||||||||||||||||||||||||
| english name | "Minnesota sister ringless amanita" | ||||||||||||||||||||||||||||
| etymology | elision of Minnesota and sorora, sister. Continuing the conceit of naming taxa of section Vaginatae with gray, friable volvas as sisters of Amanita ceciliae. | ||||||||||||||||||||||||||||
| 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 based on DNA data produced by L. V. Kudzma and other original research of R. E. Tulloss. | ||||||||||||||||||||||||||||
| pileus | 61 - 64 mm wide, grayish brown, subvirgate, darker brown (10YR 2/2 or slightly lighter) over umbo, planar with pronounced umbo in central depression, tacky, matte; context white except for thin gray line below pileipellis in disc, 4 - 4.5 mm thick over stipe, thinning evenly for 75 - 85% of radius, then membranous to margin; margin nonappendiculate, striate (0.25 - 0.55R); universal veil absent. | ||||||||||||||||||||||||||||
| lamellae | free [sometimes with faint short (<10 mm long) decurrent lines on top of stipe], close to subcrowded, cream to pale cream in mass, off-white to pale creamy white in side view, not staining when cut or bruised, 5 - 6.5 mm broad, broadest at about three-quarters of pileus radius; lamellulae truncate to subtruncate, unevenly distributed, of diverse lengths, plentiful to scattered but not uncommon. | ||||||||||||||||||||||||||||
| stipe | 132 - 176 × 9± mm, white to cream, narrowing upward, not or barely flaring at apex, minutely pulverulent near apex, finely longitudinally striatulate, fibrillose where handled, sometimes becoming gray where handled; context hollow, white (except sometimes slightly tannish in very base), not changing when cut or bruised, with no insect tunnels observed, with central cylinder 5 - 6 mm wide, with central cylinder lined with cottony white fibrils having sublongitudinal orientation; exannulate; universal veil as fragile saccate volva, sometimes remaining awhile as complete sac (e.g., 23 × 17 mm), in any case eventually breaking and tearing rather easily and then dividing into thin cup enclosing stipe base and large patches distributed on lower stipe above cupulate portion, soft textured, with exterior surface white with gray spots, with interior surface grayish, with highest point of limb 30 mm from bottom of stipe, with limb < 1 mm thick at mid-height, | ||||||||||||||||||||||||||||
| odor/taste | Odorless. Taste not recorded. | ||||||||||||||||||||||||||||
| macrochemical tests |
none recorded. | ||||||||||||||||||||||||||||
| universal veil | On pileus: not present in material examined. On stipe base: filamentous hyphae ?? mm wide, fasciculate, organized in irregular lattice enclosing inflated cells, ??; inflated cells ??; vascular hyphae ?? mm wide, ??. | ||||||||||||||||||||||||||||
| partial veil | absent. | ||||||||||||||||||||||||||||
| lamella edge tissue | sterile. | ||||||||||||||||||||||||||||
| ecology | Solitary. Colorado: At 2749 m elev. Gregarious under Populus tremuloides. Minnesota: In dark loam of forests dominated by Pinus strobus, P. resinosa, Betula, and Populus tremuloides. | ||||||||||||||||||||||||||||
| material examined | U.S.A.: Colorado—Verdemont Rd. (aka Co. Rd. 182), Tom Maddox prop. [38.1866° N/ 105.6162° W, 2749 m], 17.viii.2010 David P. Lewis 9927 (RET 464-5, nrITS seq'd.). MINNESOTA—Beltrami Co. - ca. Blackduck, Chippewa Nat. For., Meadow Lk., 25.viii.1995 participant NAMA1995 s.n. [Tulloss 8-25-95-B] (RET 156-2, nrITS seq'd.), Movil Maze Ski Area, 26.viii.1995 Pat Burchell s.n. [Tulloss 8-26-96-F] (RET 156-9, nrITS & nrLSU seq'd.). | ||||||||||||||||||||||||||||
| discussion |
In the field the original Minnesota material was
thought to belong in the
"A. rhacopus group." It appears to be
genetically distinct from all the known taxa of
that group. It has been
previously treated in these pages as A.
sp-MN05. The present taxon is listed with
other members
of a group sharing an unusual 5' motif for nrLSU,
on the technical tab of the the page for
A.
penetratrix We have received nrITS sequences apparently of the present species from alpine collections from British Columbia (courtesy Shannon Berch). | ||||||||||||||||||||||||||||
| citations |
Note: We may have received mixed
collections with regard to RET 572-7. The
photograph shows a white cap and a membranous volval
sac. The material we received produces the DNA
of A. minnesorora, which is brown-capped with a
submembranous to friable volva.] [Note: RET notes indicate that Pat Leacock may have an image of RET 156-9.] Wisconsin: In mixed forest of Betula spp, Quercus rubra, Picea, Abies, and Tsuga canadensis. WISCONSIN—Unkn. Co. - Lake Lucerne, Ed's Lake Trail [45.53005° N/ 88.84485° W, 500m], 20.vii.2013 Britt Bunyard s.n. [mushroomobserver #140595] (RET 572-7, nrITS seq'd.).]—R. E. Tulloss | ||||||||||||||||||||||||||||
| editors | RET | ||||||||||||||||||||||||||||
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