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The following material is derived from (Lamoureux 2006) and from original research of R. E. Tulloss. The photograph (fig. 9) of the present species in (Lamoureux 2006) was used to supplement Lamoureux's written description.
Lamoureux (2006): 30 - 80 mm wide, brown to fuligineous over disc, light orange-brown to brown over striations, orange-brown to orange-tan in zone intermediate between disc and striations, sometimes pale brown in dry weather, ovoid at first then campanulate and finally concave, umbonate; context white; margin nonappendiculate, striate (0.35±R); universal veil absent.
Lamoureux (2006): 60 - 150 × 5 - 12 mm, white or pale orange-brown, narrowing upward, often decorated by densely placed orange-brown fibrils in zebroid pattern; context white; exannulate; universal veil as saccate volva, membranous to submembranous, with lower 7.5 - 13 mm attached to basal part of stipe, with remainder (13 - 17.5 × 12 - 25 mm) abruptly expanded by cap expansion and sometimes separated from lower portion exposing section of white undecorated stipe (e.g., 15.5± mm long) between separated volval parts.
Lamoureux (2006): Odor indistinct. Taste not recorded.
Lamoureux (2006): On clayey soil in mixed forests including Carpinus, Carya, and Quercus, from July to September.
CANADA: QUÉBEC—Champlain - Longueuil, 17.vii.1992 Y. Lamoureux 1695 (CMMF; RET 521-7).
Lamoureux (2006) notes that this taxon has only been collected to date in region around the city of Montréal. It is distinguishable from A. fulva sensu Lamoureux (2006) by the zonate nature of the pileus and by the difference of tree genera in the forest types in which the two taxa occur. He concludes, "...A. pseuddofulva must have been widespread and common in Montérégie before the almost total disappearance of the old broadleaved forests in which oaks, hickories, lindens [or basswoods (Tilia)], and hornbeams were abundant."
One section from a lamella of Lamoureux 1695 (RET duplicate) shows the basidia and spores to be badly damaged—collapsed and partially gelatinized. A second section shows plentiful basidia bearing uniform spores that don't seem to be ejected—none float free in the mount; the spores are much smaller than those for which Lamoureux gives measurements (the major diameter of the viewed spores measures 3.5 - 4.0 μm) and some of the spores seem to have a finely punctate surfaces at 1250× viewed with Nomarski differential interference contrast. This suggests that at least one basidiome was not dried and preserved well and at least one basidiome seems to be parasitized with the effect of having abnormal spore development. Both of the sections studied showed basidia that were much shorter and narrower than one expects to see in section Vaginatae. For example, basidia were less than 6.0 μm wide.
The spore measurements provided above came from a half of a spore print that was included in the RET duplicate of Lamoureux 1695.
Translation of (Lamoureux 2006) from French by RET, who is responsible for any errors.—R. E. Tulloss and Y. Lamoureux.
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Spore data for collections provisionally identified as: Amanita pseudofulva Lamoureux
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.
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a single collection inadvertently contains a mixture of taxa.