name | Amanita trygonion |
name status | nomen provisorum |
author | Tulloss, Pastorino & Kudzma |
english name | "Little Dove Ringless Amanita" |
images | |
intro | The following description is based on original research by the authors of this page. |
cap | The cap of this specis is about 47 mm wide. At first the center of the cap is buff, while the remainder is pale grayish. As the mushroom ages the cap becomes grayer except for the center which becomes yellower. The cap is ovoid at first and becomes broadly bell-shaped with a distinct umbo. The cap's flesh is white. The margin of the cap is radially grooved with grooves occupying one-fifth to one-fourth of the cap's radius. There is no volval material remaning on the cap. |
gills | The gills are narrowly connected to the stem in material viewed so far; they are close and cream to white. The short gills are squarely cut-off or nearly so and not very common. |
stem | The ringless stem of A. trygonion is 106 - 120 × 6 - 7.5 mm and white to off-white. The stem is inserted in a white, persistent, membranous, sack-like volva ranging up to 29 × 15.5 mm and attached to the stem's base. |
odor/taste | The odor of this mushroom is slight or indistinct. Its taste has not been recorded. |
spores | The spores of A. trygonion measure (7.9-) 9.5 - 12.5 (-13.0) × (7.1-) 8.2 - 10.3 (-11.5) μm and are dominantly broadly ellipsoid (sometimes subglobse or ellipsoid) and inamyloid. Clamps are absent from bases of basidia. |
discussion |
Amanita trygonion is known only from
pine-dominated
mixed forest in sandy soils of eastern Texas. This species suggests Amanita sp-V01 to which the reader may wish to refer. This species was formerly called "Amanita sp-T46" on this site.—R. E. Tulloss and R. L. Pastorino |
brief editors | RET |
name | Amanita trygonion | ||||||||||||||||
author | Tulloss, Pastorino & Kudzma | ||||||||||||||||
name status | nomen provisorum | ||||||||||||||||
english name | "Little Dove Ringless Amanita" | ||||||||||||||||
etymology | τρυγωνιων , Gr., dovelet, also a "pet name" for a little girl. | ||||||||||||||||
GenBank nos. |
Due to delays in data processing at GenBank, some accession numbers may lead to unreleased (pending) pages.
These pages will eventually be made live, so try again later.
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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 molecular work of L. V. Kudzma and other original research by R. L. Pastorino and R. E. Tulloss. | ||||||||||||||||
pileus | Up to 47± mm wide, sordid cream becoming somewhat grayer with age, with buff disc becoming somewhat yellower with age, campanulate at first, then broadly campanulate, with distinct umbo, glabrous; context white; margin striate (0.2 - 0.25R); universal veil absent. | ||||||||||||||||
lamellae | adnexed, close, cream-white; lamellulae truncate or rounded truncate, infrequent to rare. | ||||||||||||||||
stipe | 106 - 120 × 6 - 7.5 mm, white to off-white; context ??; exannulate; universal veil as saccate volva, roughly cylindric or slightly flaring, white, membranous, persistent, up to 29 × 15.5 mm, adhering to stipe base. | ||||||||||||||||
odor/taste | Odor slight or indistinct. Taste not recorded. | ||||||||||||||||
macrochemical tests |
none recorded. | ||||||||||||||||
lamella trama | bilateral, divergent. | ||||||||||||||||
basidia | 52 - 59 × 14.8 - 16.5 μm, dominantly 4-, sometimes 1- or 2- sterigmate; ??. | ||||||||||||||||
partial veil | absent. | ||||||||||||||||
lamella edge tissue | sterile. | ||||||||||||||||
basidiospores | [40/2/1] (7.9-) 9.5 - 12.5 (-13.0) × (7.1-) 8.2 - 10.3 (-11.5) μm, (L = 10.6 - 11.3 μm; L' = 10.9 μm; W = 9.0 - 9.4 μm; W' = 9.2 μm; Q = (1.05-) 1.10 - 1.33 (-1.40); Q = 1.17 - 1.20; Q' = 1.19), hyaline, colorless, smooth, thin-walled, inamyloid, subglobse to broadly ellipsoid to (occasionally) ellipsoid, adaxially flattened; apiculus sublateral, cylindric; contents dominantly mono-guttulate, with many additional small granules; white in deposit. | ||||||||||||||||
ecology | In sandy soil of mixed forest dominated by Pinus. | ||||||||||||||||
material examined | U.S.A.: TEXAS—Hardin Co. - Big Thicket Nat. Preserve, Lance Rosier Unit, 14.vi.2014 Ron Pastorino 6-14-14B [mushroomobserver #167973] (RET 622-5, nrITS & nrLSU seq'd.). | ||||||||||||||||
discussion |
Some years ago, material then thought to be
Amanita sp-V01
was collected in eastern Texas [11.vi.2009 D. P.
Lewis 9043 (RET 430-6)]. The nrITS from the
present species is very different from that of RET
430-6 (23.87% difference in pairwise comparison of
tightly trimmed nrITS sequences). We have not
excluded the original material that (from our point
of view) defines sp-V01; sequencing efforts
for the two relevant collections are
underway. The following comparison
sporograph illustrate spores size-shape information
for the present taxon and for material presently
assigned to A. sp-V01. Next step: Now that we have genetic data from the present taxon, we need to get the same from material identified as sp-V01 for comparison. This species was formerly called "Amanita sp-T46" on this site. | ||||||||||||||||
citations | —R. E. Tulloss, R. L. Pastorino and L. V. Kudzma | ||||||||||||||||
editors | RET | ||||||||||||||||
Information to support the viewer in reading the content of "technical" tabs can be found here.
name | Amanita trygonion |
name status | nomen provisorum |
author | Tulloss, Pastorino & Kudzma |
english name | "Little Dove Ringless Amanita" |
images | |
photo | Ronald L. Pastorino - (1) Big Thicket National Preserve, Hardin County, Texas, U.S.A. (RET 622-5). [Note: The original, untrimmed image is available here.] |
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.