| name |
Amanita sp-N53 |
| 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 |
38 mm wide, gray-brown, faintly virgate, unchanging when cut or bruised, plano-convex at maturity with slight umbo, viscid when moistened; context white, unchanging, ca. 3 mm thick above stipe; margin short-striate, nonappendiculate; universal veil absent. |
| lamellae |
??, ??, white in side view, 3 - 3.5 mm broad, broadest at mid-length; lamellulae ??. |
| stipe |
85 × 6 mm, white or whitish, cylindric; context white, unchanging, not solid, with central cylinder 4.5 mm wide; exannulate; universal veil as saccate volva, membranous, white, persistent, 30 mm high as photographed, appressed to stipe in age. |
| odor/taste |
not recorded. |
macrochemical
tests |
none recorded. |
| basidiospores |
composite of all data from material examined by RET: [20/1/1] 10.5 - 13.3 × (9.7-) 9.9 - 11.2 (-11.9) μm, (L = 11.7 μm; W = 10.5 μm; Q = (1.05-) 1.07 - 1.19; Q = 1.11), hyaline, colorless, thin-walled, smooth, inamyloid, subglobose to broadly ellipsoid, at least somewhat adaxially flattened; apiculus sublateral, cylindric, proportionately small; contents dominantly monoguttulate; color in deposit unknown. |
| ecology |
Connecticut: At 0-35 m elev. In sandy soil with high organic content in mixed woods. |
| material examined |
U.S.A.: CONNECTICUT—New London Co. - SE of Groton, Bluff Point St. Pk. [41°19'11" N/ 72°01'55" W, ca. 0-35 m], 1.viii.2008 R. Aaron s.n. [Tulloss 8-1-2008-A] (RET 446-7). |
| discussion |
This possibly distinct entity is known from a single specimen of which the volva was collapsed against the stipe and, hence, not describable in the preferred manner.
A sporograph comparison of known, northeastern U.S. species with gray, brown-gray, or gray-brown caps and having similar values for Q is provided in the following figure:
The apparent best matches are with A. longicuneus and A. sp-V01. The former species has striations occupying a significantly larger proportion of the cap radius than is shown in the photograph of the present material. Amanita sp-V01 has striations occupying about 25% of the cap radius and is a closer fit in this regard. However, the single extant photograph of A. sp-V01 shows a cap that appears grayer than is depicted in the illustration of the present species. The major macroscopic difference between A. longicuneus and A. sp-V01 that is not pigment-related concerns the limbus internus of the volval sac. It is unusually long in the former and minimal or absent in the latter. Unfortunately the collapsed state of the universal in the present material prevented our having knowledge of its limbus internus.
Considering that the material representing A. sp-N53 was mature when sampled for spore size/shape, it is unlikely that the spore measurements for the present species include "giant" spores or in some other manner exaggerate the size of the spores of A. sp-N53. Therefore, we treat it as a new provisional, code-numbered species. |
| citations |
—R. E. Tulloss |
| editors |
RET |
|
Spore data sets and their composite