name | Amanita sp-N50 |
name status | cryptonomen temporarium |
author | Tulloss |
images | |
intro | This unusual mushroom struck RET at first as a specimen of the U.S. Gulf Coast species, A. levistriata; however, the spores and DNA are incompatible with that species. |
cap | The cap of Amanita sp-N50 is about 38 mm wide, yellow, and hemispheric to convex. Its flesh is whitish and unchanging, and its margin is briefly striate (0.05 - 0.1R) and not appendiculate. The powder volva is olivaceous to brown small and remains on the cap in small warts and irregular patches. |
gills | The gills are white or whitish. |
stem | The stipe is 31 × 4.5 mm, whitish above and olivaceous yellow to olivaceous below. The stipe's bulb is large for a small mushroom and turnip-shaped. The rather dense layer of volva on the lower stem and upper bulb is colored as it is on the cap. |
odor/taste | No odor has been recorded for this mushroom. |
spores | The spores measure 11.2 - 12.6 × 6.3 - 7.7 μm and are elongate and inamyloid. Status of clamps on basidia is not established. |
discussion | —R. E. Tulloss |
brief editors | RET |
name | Amanita sp-N50 | ||||||||
name status | cryptonomen temporarium | ||||||||
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 original research of R. E. Tulloss. | ||||||||
pileus | ca. 38 mm wide, yellow, hemispheric to convex, ??; context whitish, unchanging, ??; margin briefly striate (0.05 - 0.1R), nonappendiculate; universal veil as small warts and irregular patches, olivaceous to brown, pulverulent. | ||||||||
lamellae | white or whitish. | ||||||||
stipe | 31 × 4.5 mm, whitish above, olivaceous yellow to olivaceous below (probably due to material of limbus internus of volva), fibrillose in "flame" ("snakeskin" or "zebroid") pattern; bulb proportionately large and napiform, subabrupt, 22 × 13 mm; context not recorded; partial veil ??; universal veil concolorous with that on pileus, as rather dense powdery layer on lower stipe and upper bulb (visible downward to near broadest part of bulb). | ||||||||
odor/taste | not recorded. | ||||||||
macrochemical tests |
none recorded. | ||||||||
lamella trama | bilateral, divergent; ??. | ||||||||
subhymenium | pseudoparenchymatous (cellular); ??. | ||||||||
basidia | ca. 48 × 12.0 μm, 4-sterigmate at maturity, ??; clamps not observed. | ||||||||
basidiospores | composite of data from all specimens revised by RET: [45/2/2] (8.5-) 9.0 - 12.6 (-14.7) × (5.7-) 6.0 - 8.0 (-10.0) μm, (L = 9.3 - 11.3 μm; L' = 10.4 μm; W = 6.3 - 7.1 μm; W' = 6.7 μm; Q = (1.22-) 1.36 - 1.78 (-1.91); Q = 1.48 - 1.60; Q' = 1.54), hyaline, colorless, smooth, thin-walled, inamyloid, ellipsoid to elongate, rarely broadly ellipsoid, predominantly adaxially flattened, infrequently constricted or adaxially depressed, occasionally with "giant" spores present; apiculus sublateral, cylindric, proportionately small; contents predominately monoguttulate of the "oil drop" form with additional small granules, infrequently multiguttulate or granular; color in deposit not recorded. | ||||||||
ecology | Solitary. Connecticut: In mixed forest. | ||||||||
material examined | U.S.A.: CONNECTICUT—Middlesex Co. - Salmon River St. For. (north section), 23.viii.2008 John Wheeler s.n. [Tulloss 8-23-08-A] (RET 420-8). NEW JERSEY—Somerset Co. - Bridgewater, Duke Island St. Pk., 1.ix.2013 Naomi Goldman & Ricky Resciniti s.n. (RET 566-4, nrITS). | ||||||||
discussion |
The habit, colors, and form of the volva are similar
to those of A.
levistriata and A.
siamensis. A comparison of the
sporographs of the three species is provided in
the following figure: Because of the presence of giant spores in the present species, a larger sample of spores from mature four-sterigmate basidia will reduce the 95th percentile values of length, width, and Q—making the sporograph of A. sp-N50 more similar to that of A. siamensis. It appears that the pair, A. siamensis and A. sp-N50, may be a new example of Grayian distribution—a distribution of closely related taxa that is limited to the eastern regions of North America and Asia. Somewhat similar material from Long Island (A. sp-57) needs to be compared with the present material. The latter is rather close genetically to A. levistriata according to recent sequencing results. Data from sp-57 is included in the following sporograph comparison: | ||||||||
citations | —R. E. Tulloss | ||||||||
editors | RET | ||||||||
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