Growing with mixed conifers @ ~ 6000 ft.
Caps up to 10.6 cm across.
Stems with lilac hues on lower portion
5% KOH light reddish on cap and flesh.
Spores appeared to be of two shapes. The simple elliptical/elongate and many with a more stretched out shape, and both only slightly rough.
The smaller spores were ~ 9 X 5 microns while the larger ones were ~ 11-14 X 5 microns with a fairly long apiculus.
Odor was not strong.


5% KOH on cap and flesh(two on left)
Spores from one fb

Proposed Names

57% (1)
Recognized by sight
64% (2)
Used references: ID from DNA sequence result per Shannon Adams

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

= Observer’s choice
= Current consensus


Add Comment
Clearly that is true …
By: Debbie Viess (amanitarita)
2019-03-18 13:18:54 CDT (-0400)

more work is needed to firm up a species concept for calyptratus.

I am aware that the Michigan collection is the type; apparently Smith collected it in CA, with stated potential host trees being spruce and redwood; Moser claims that Lithocarpus was present in all areas where it was collected, though it is unclear if he also means Smith’s sites (see Matchmaker Cortinarius calyptratus page). Moser found it in OR. Only two sequence of this purported species are up on Genbank: the type and one from the PNW, which is not a good DNA match to the type. Apparently, your example here has not been added to Genbank yet, which is why it didn’t match up to itself, best of all.

Sometimes amanitas produce "giant " spores, too. Maybe there is something like this going on here, too? But odd that the KOH spot test showed different colors from the type. Maybe there are some cryptics involved? Wouldn’t be surprising.

The Michigan material was the Type collection
By: Ron Pastorino (Ronpast)
2019-03-17 17:20:05 CDT (-0400)

and collected under spruce and Redwood, I assume from the West Coast.
I would think that perhaps the other PNW material was mis-identified(?).
My spore data on these is confusing although the smaller group of spores did match the description.
Maybe this species needs more work with more collections.

some discrepancies …
By: Debbie Viess (amanitarita)
2019-03-17 14:43:58 CDT (-0400)

check the Matchmaker page on C. calyptratus. The larger spore sizes do not match; gills as described only rarely show lilac tones and then near the stipe, and KOH is brown not red. Also, associated with hardwoods not conifers, altho there might be some wiggle room on this.

Ran the BLAST too … 100% match to Michigan collection but only 94% match to another C. calyptratus from the PNW.

Normally on Genbank I would see the sequence that I am attempting to match at the very top, with a 100% match to itself, as one would expect. Why do I not see this with this example?

Created: 2017-09-22 16:25:08 CDT (-0400)
Last modified: 2019-03-18 13:18:55 CDT (-0400)
Viewed: 133 times, last viewed: 2019-07-04 21:28:59 CDT (-0400)
Show Log