Observation 204597: Amanita roseitincta (Murrill) Murrill
When: 2015-05-19
No herbarium specimen

Notes: ADDED Spore Measurements by two methods

ADDED images of the surface features of the pileipellis. I don’t know what these large surface cells/structures are. They are similar to those found on Phaeolepiota, so maybe it’s the dust left by the universal veil.

NOTES: Originally I thought this was a very large Cystoderma, possibly Cystoderma fallax ( and it might be). However looking at the surface of the cap under a microscope makes me think it is Phaeolepiota. I compared surface cells to microscopic photos from
http://www.gobice.com/...

Items at odds with an ID of Phaeolepiota are that the spore color is white, no appreciable smell and white gills and flesh.

There is a discussion of Phaeolepiota here
http://www.mushroomthejournal.com/bestof/Paureatext.html

Microscope photos to be added.

Habitat. Growing in soil and pine litter under short-leafed pine.

Smell – can’t smell anything but I have hay fever

Cap – 3.5 inches across. Convex. Dusted with fine orange dust.

Gills – white. Adnate – attached to stalk.

Ring – soft material – intact, about 1 inch wide, attached to stem close to gills.

Stalk – fleshy, hollowing in lower portion with soft material at center. Bulbous at base. 6.5 inches long. 5 inches from gills to beginning of bulb. 2 cm thick at gills, 1.5 cm at narrowest,2.5 cm thick at beginning of bulb. Bulb is 2 inches thick. Volva remnants seemed to be around the bulb, left in the ground when I dug it up, the remnants are intense orange as shown in the photo.

Did not notice appreciable smell. Did not taste.

Spore Print – thick white deposit. This was a surprise because the entire mushroom is covered with orange dust.

Spore Dimensions – (Measured by fitting an ellipse around in focus spore, face view)
[20/1/1] L (-) 9.3 – 10.2 (-) μm x W (-7.3) 7.4 – 8.7 (-) μm, (L = 9.7 μm, W =8.1 μm), Q (-1.12) 1.13 – 1.28 (-1.31), Q = 1.20

Spore Dimensions – Measured as recommended by R. Tulloss ( as best I could, out of 12 photos, I only found 16 spores in the correct orientation.)

[16/1/1] L (-8.9) 9.1 – 10.1 (-11.2) μm x W (-7.0) 7.2 – 8.1 (-9.1) μm, (L = 9.5 μm, W =7.7 μm), Q (-1.17) 1.18 – 1.31 (-1.37), Q = 1.24

Images

521746
20150519-PANO_2015P1110263.jpg
521747
20150519-PANO_2015P1110271.jpg
521748
20150519-PANO_2015P1110268.jpg
521749
20150519-PANO_2015P1110264.jpg
521750
20150519-PANO_2015P1110254.jpg
521915
20150520-LX1_2015P1050023.jpg
surface elements of the pileipellis. 400x
521916
20150520-LX1_2015P1050022.jpg
surface elements of the pileipellis. 400x
521917
20150520-LX1_2015P1050020.jpg
surface elements of the pileipellis. 400x
521918
20150520-LX1_2015P1050021.jpg
surface elements of the pileipellis. 400x
522041
20150521-LX1_2015P1050042.jpg
Spore – 1000x – Acid Fuchsin and Lignin Pink in solution in a lacto-phenol solution with glacial acetic acid
522042
20150521-LX1_2015P1050053.jpg
Spore – 1000x – Acid Fuchsin and Lignin Pink in solution in a lacto-phenol solution with glacial acetic acid
522043
20150521-LX1_2015P1050055.jpg
Spore – 1000x – Acid Fuchsin and Lignin Pink in solution in a lacto-phenol solution with glacial acetic acid
522044
20150521-LX1_2015P1050056.jpg
Spore – 1000x – Acid Fuchsin and Lignin Pink in solution in a lacto-phenol solution with glacial acetic acid

Proposed Names

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
Free Gills – 2
By: L G Price (LG_Price)
2015-05-20 12:44:52 CDT (-0400)

OK, I see my mistake. The gills actually attach to the underside of the cap with a gap between the edge of the gills and the stem. The gills taper to nothing where they attach to the underside of the cap. I mis-interpreted what I was seeing.

Free gills—-almost
By: walt sturgeon (Mycowalt)
2015-05-20 12:31:12 CDT (-0400)

I am not very familiar with this species but there are Amanitas that have gills that just barely reach the stem.

Free Gills
By: L G Price (LG_Price)
2015-05-20 12:18:38 CDT (-0400)

Thanks for the ID.

It seems that I must mis-interpret the definition of “free” gills.

I looked at Amanita roseitincta at the site
http://www.amanitaceae.org/?Amanita%20roseitincta

and it seems to be the same mushroom.

Created: 2015-05-20 11:53:39 CDT (-0400)
Last modified: 2015-07-10 19:10:10 CDT (-0400)
Viewed: 129 times, last viewed: 2017-06-20 04:21:02 CDT (-0400)
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