Observation 261779: Amanita lavendula group

When: 2016-11-12

Collection location: Sheatown, Pennsylvania, USA [Click for map]

Who: Dave W (Dave W)

Specimen available

Notes:
Fruit body appeared to be somewhat old, and possibly the cap color had faded or darkened with age. Cap color light off-white with slightly darker UV patches. Photos taken in fairly low light, but observable cap color is close to what I observed first-hand.

Basal bulb softish.

Annulus gray.

Reminds me mainly of the lavendula type(s), but also seems soemwhat like porphyria.

Spores measured from two different potions of a print taken on a slide. One sample 7-10 × 7-9.5; the other 8-11 × 8-10.5. Spores globose to subglobose. Size is significantly larger than what is reported for lavendula.

In stand of pine (a 2 or 3 needle variety; not white pine) with some small hardwoods (oak, birch) mixed in.

This specimen sat out for a day before I put it into the dehydrator.

Images

Proposed Names

61% (2)
Recognized by sight
29% (1)
Based on microscopic features: spore shape/size.

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus

Comments

Add Comment
I see that the spores…
By: Dave W (Dave W)
2016-11-16 21:58:58 CST (-0500)

for “sp-lavendula01” are a tad bit larger (and perhaps rounder) than what is reported for “lavendula”. As you say, small numbers of samples representing this species suggest there may be more variation to spore size than is currently understood. I have preserved this specimen; you may have it if you like.

Also, there is an error on the “sp-lavendula01” web page. The location for my collection reads “Gifford Pinchot State Park, York County, PA”, but it should be “Lackawanna State Forest, Thornhurst, Lackawanna County, PA”. This area is also known as “Gifford Pinchot State Forest”. I have stopped using this name on account of there being multiple locations in PA bearing the name “Gifford Pinchot”.

I posted a sporograph comparing spores of porphyria and …
By: R. E. Tulloss (ret)
2016-11-16 21:39:24 CST (-0500)

__A._ “sp-lavendula01” on the techtab (bottom of the page) here:

http://www.amanitaceae.org?Amanita%20sp-lavendula01

All the dope I’ve collected on porphyria is here:

http://www.amanitaceae.org?Amanita%20sp-porphyria

This is the “hybrid” with many, many different LSU sequences. Its partial veil can turn quite gray at or after maturity of the fruiting body.

The porphyria spores are a tad larger (0.7 um longer) than those of __A._ “sp-lavendula01”. The sample size for the spore measurements are not very big as those things go. The might be more similar or less similar with lots more data.

Very best,

Rod

Occurrence very late in the season…
By: Dave W (Dave W)
2016-11-16 20:56:52 CST (-0500)

favors lavendula. Although, in the past I have found porphyria in mid October. I have made lavendula collections with gray annulus, so this did not really put me off the lavendula proposal for this one. What really got my attention here was the large globose spores.

One or more of the lavendula group has a partial veil that turns gray.
By: R. E. Tulloss (ret)
2016-11-16 20:47:09 CST (-0500)

I have seen an albino porphyria (or washed out porphyria) once or twice in the PNW. Not in the east. If it doesn’t start out with virgate cap that is some shade of brown, I think it is more likely to be in the lavendula group especially given that we are in the middle of November now.

Very best,

Rod

Created: 2016-11-16 20:15:18 CST (-0500)
Last modified: 2016-11-16 21:03:06 CST (-0500)
Viewed: 53 times, last viewed: 2020-07-15 11:28:08 CDT (-0400)
Show Log