When: 2017-11-18
Collection location: Big Basin Redwoods State Park, Santa Cruz Co., California, USA [Click for map]
Who: Ruzica and Sava Krstic (ruzasava)
Notes:
On woodchips, by the road.
A few spores measured 4.5-6 × 3-4.5.
Images
| User’s votes are weighted by their contribution to the site (log10 contribution). In addition, the user who created the observation gets an extra vote. | |||||||||
| Vote | Score | Weight | Users | ||||||
|---|---|---|---|---|---|---|---|---|---|
| I’d Call It That | 3.0 | 0.00 | 0 | ||||||
| Promising | 2.0 | 0.00 | 0 | ||||||
| Could Be | 1.0 | 5.82 | 1 | (ruzasava) | |||||
| Doubtful | -1.0 | 0.00 | 0 | ||||||
| Not Likely | -2.0 | 0.00 | 0 | ||||||
| As If! | -3.0 | 0.00 | 0 | ||||||
| Overall Score sum(score * weight) / (total weight + 1) |
0.85 | 28.45% | |||||||
| User’s votes are weighted by their contribution to the site (log10 contribution). In addition, the user who created the observation gets an extra vote. | |||||||||
| Vote | Score | Weight | Users | ||||||
|---|---|---|---|---|---|---|---|---|---|
| I’d Call It That | 3.0 | 0.00 | 0 | ||||||
| Promising | 2.0 | 5.82 | 1 | (ruzasava) | |||||
| Could Be | 1.0 | 0.00 | 0 | ||||||
| Doubtful | -1.0 | 0.00 | 0 | ||||||
| Not Likely | -2.0 | 0.00 | 0 | ||||||
| As If! | -3.0 | 0.00 | 0 | ||||||
| Overall Score sum(score * weight) / (total weight + 1) |
1.71 | 56.89% | |||||||
Comments
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You can see how featureless Agaricus spores usually are. Size measurements are about all they have to tell us. A. buckmacadooi has very slightly larger spores than A. deardorffensis but they are so close, it’s hard to use those data with high confidence. When you get a chance to see a phylogenetic tree (based on ITS DNA sequences), though, you will see that the two species are not particularly close relatives.
Thank you for your comment. I don’t know A. buckmacadooi (though I know Buck) and I don’t have your book, but I am going to order it now. I added the only microshot I have, in case you can see something useful there.
To my eye it looks a bit more like A. buckmacadooi, but along with A. deardorffensis, both of these largish species are poisonous. It’s tough to separate the two species by eye, but the first one can be darker.