Observation 179833: Amanita sect. Vaginatae sensu Zhu L. Yang
When: 2014-09-21
(39.8146° -74.5502° )

Notes: > A single specimen growing on the sandy shoulder or Rt. 563 in the North Gate sector of FPP. This location has previously yielded collections of Amanita saggitaria.

Spores inamyloid in Melzer’s;
[21/1/1]: L x W = 10.7-15.3 (-16.7) x (7.0-) 7.4-8.4 (-8.8) μm;
L x W = 12.8 × 7.9 μm;
Q = (1.39-) 1.44 – 1.79 (-2.0), ellipsoid to elongate; Q = 1.63

As frequently observed with ellipsoid & elongate amanita spores that fall directly from the gills onto a glass slide before being treated with a mounting agent, the greater majority of them prefer to orientate themselves on the glass surface with the apiculus facing down. In that orientation that is perhaps the second suitable orientation for taking measurements (with the lateral view & apiculus to the side being the optimum disposition), the spores appear almost perfectly symmetrical with the apiculus seen as a rounded bump at the apex. The second from the bottom pic demonstrates this effect — out of more than 50 spores visible in this photo no more that 5 spores are orientated laterally!

Based on the spore measurements, this specimen is unlikely to be A. dulciarii. It would be interesting to find out what picture the DNA sequencing paints.

For a similar observation from the Pine Barrens see obs 151105 — that one was collected from the Speedwell section of FPP.


Mounted in Melzer’s and viewed at x400
Mounted in Melzer’s and viewed at x1000
Mounted in Melzer’s and viewed at x1000;
seen here is the longest observed spore (16.7 × 8.4 um)
with the largest Q value.

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Add Comment
Spore measurements and pix posted
By: I. G. Safonov (IGSafonov)
2015-02-07 01:00:35 CST (-0500)
Thanks Igor,
By: groundhog
2014-10-28 16:12:11 CDT (-0400)

This material has been received and accessioned to Rod’s herbarium. We have scheduled it for DNA sequencing.

Created: 2014-09-22 16:35:48 CDT (-0400)
Last modified: 2015-02-07 00:59:26 CST (-0500)
Viewed: 66 times, last viewed: 2016-10-25 01:33:23 CDT (-0400)
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