Showing posts with label American Caesar’s Mushroom. Show all posts
Showing posts with label American Caesar’s Mushroom. Show all posts

Saturday, November 21, 2015

American Caesar’s Mushroom (Amanita jacksonii)


August 25th. I was driving home when I spotted a cluster of mushrooms at the edge of the woods by the road. I knew immediately that they were Caesar’s Amanita (Amanita jacksonii) mushrooms. What surprised me was the size of the largest one. Its cap was 7 to 8 inches in diameter, the largest I had ever seen.

The cluster, from different angles.


The caps of the buds are oval. As they open, the caps become convex, then flat, and finally depressed as are the larger mushrooms in this cluster.


The caps of these mushrooms are solid red, without any scales. Mature caps on these mushrooms have marked striations from the margin towards the center.


Their gills are yellow and crowded, and free from their stems.


Their stems taper slightly from the base to the top and are yellow (or orange) with orange-red fibers, often in zones. Stems have a yellow-to-orange ‘skirtlike’ ring. In addition, one of the most striking things about this mushroom is that the remains of the volva – the membrane that encases the growing mushroom – are often visible at the base of the stem, even when the mushroom is mature. 

These mushrooms may be found east of the Great Plains in the United States where they have a mycorrhizal relationship with the roots oaks and pines. They fruit in summer and fall.

Identification resources: 
- Michael Kuo, MushroomExpert.com: Amanita jacksonii 
- Roger’s Mushrooms: Amanita jacksonii 

Related posts:  

Saturday, September 8, 2012

Still More American Caesar’s Mushroom (Amanita jacksonii)


August 18th, 2012. I mentioned before that I was delighted to see the volvas on the American Caesar’s (Amanita jacksonii) mushrooms this year when I’d never seen them before. We were driving down Oscar Walton Road when I spotted two sentinel…

American Caesar’s mushrooms on an embankment beside the road. They were beautifully colored.

The volva was quite evident on the mushroom on the right. When I photographed them, I noticed two more amanitas on the…

top of the embankment nearby. They weren’t quite as photogenic as the first two but…

The volvas on each was clearly visible and the cap on the mushroom on the left had just ‘cleared’ its volva.
Click on an image to view a larger image

Identification resources:
- Rodham E. Tulloss, Eticomm.net: Amanita jacksonii
- Michael Kuo, MushroomExpert.com: Amanita jacksonii
 
Related post:

Saturday, July 28, 2012

American Caesar’s Mushroom (Amanita jacksonii) Revisited


July 21st, 2012. We set out to look for more routes with gravel roads - preferably not mowed - that would be good places to look for wildflowers. We found ourselves in Greene County, Georgia – not far east of the Scull Shoals Experimental Forest. In fact, if we continued on the forest road we use to get to the Scull Shoals EF, we would reach this area. We just don’t go this way often – that may have to change.

It’s probably also important to note that, after months without any rain and temperatures in the 90s F, we’d had about five very welcome inches of rain. I hadn’t thought much about it, but these are ideal conditions for mushrooms to appear.


I posted this photo, taken in Wilkes County, Georgia, in July last year. This was a particularly attractive group of these mushrooms.

W stopped to consult the gazateer and I saw a couple of American caesars in the woods but they were pale orange; not as pretty as the deeper red-capped ones. So I kept my eyes open and finally spotted some nice specimens.


 The group we spotted on July 21st were scattered over a larger area and…


partially obscured by pine needles.


I cleared away pine needles from one that was out in the open and, finally, found what I’d been looking for – the cup or volva that is diagnostic for Amanita (and Volvariella) species. I was taught that this was a method for recognizing amanitas but, search as I have, I have never seen a volva still attached to one. This day was my lucky day…One, and only one of the amanitas in this group had a volva!

A closer view of the volva on this mushroom. It was partially filled with water from recent rains.

All mushrooms have the a partial veil that ‘connects’ the cap to the stem at the annulus or ring; sometimes remnants of this veil are still attached to the stem after the mushroom has opened. Amanitas have another veil, the universal veil, that encloses the entire mushroom as it emerges from the ground. As the mushroom develops, the veil breaks and remains attached – the volva - to the base of the mushroom.

Daniel Spurgeon at ‘Nature at Close Range’ has a wonderful photograph of this mushroom at an earlier stage where the volva is much more evident. 


Amanita jacksonii is cutest at this stage but it wouldn’t do justice to the species not to photograph a fully opened mushroom that we found further along this same road.

Postscript. I ride to work in a vanpool. A few days after spotting these mushrooms, I spotted more in the front lawn of a house along our route. There were two groups in the early stages of opening. The spores had obviously washed down the slope and the mushrooms were arranged in two rows down the slope. I’m going to have to remember to take my camera around this time next year and try to get photographs of these.
Click on the image to view a larger image

Identification resources: 
- Rodham E. Tulloss, Eticomm.net: Amanita jacksonii

Related post: 

Sunday, July 17, 2011

American Caesar’s Mushroom (Amanita jacksonii)?

I saw a couple as we were driving along Hwy 44 but they were orange rather than red; not good specimens. And then, as we drove along the pinewoods section of Anthony Shoals Road in the Broad River Wildlife Management Area, I spotted a cluster that was a brilliant red color. Too good to pass up. So we backed up and got out.

The light wasn’t good. The skies were dark with an impending thunderstorm and the mushrooms were growing on an embankment under the edge of a thick pine woods. So I used LED lights to take some macro shots.

*****
The closest identification I can arrive at, based on comparing photographs on mushroom web sites, is American Caesar’s Mushroom (Amanita jacksonii). The caps are the right color – a rich red with minute vertical striations that are clearly visible in the lower image. I’m questioning the identification because they don’t appear to have volvas and I would have thought that the volvas should still be quite visible at this stage of development. Unfortunately we weren’t able to follow the development of the cap to see if the mature cap also resembled Amanita jacksonii.

Any thoughts on this identification?

Click on the image to view a larger image


Identification resources:

- Rodham E. Tulloss, Eticomm.net: Amanita jacksonii

- Michael Kuo, MushroomExpert.com: Amanita jacksonii