Observation 204772: Lyophyllum decastes group
When: 2015-05-15

Notes: After PDAB had faded flesh turned yellow around the edge of area where the reagent was applied. Spores white averaging 6.8 × 5.1. Spores (measured from a spore deposit) appeared with either one large gray guttule, solid gray, or filled with granular material in approximately equal numbers. Collection was found amongst 15-20 year old pine with somewhat younger Grand Fir.

Proposed Names

27% (1)
Recognized by sight: Stature of Lyophyllum decastes but I’m not familiar with any near white species and it didn’t respond to PDAB reagent. The fact that the PDAB is getting pretty old may have been a factor.
27% (1)
Based on chemical features: See Lab Report in Comments below

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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BLAST results lab report
By: Joe Cohen (Joseph D. Cohen)
2016-05-17 23:11:48 COT (-0500)

Thanks to Kelli Van Norman and ISSSSP for funding the sampling:

BLAST results for OMS Mycoflora group samples
compiled by Matt Gordon, Molecular Solutions, LLC, 11/17/2015
x434 Identified as Lyophyllum decastes MO 204772
The top matches are Lyophyllum fumosum—part of the Lyophyllum decastes species complex. There are many ITS sequences for each of these species, so I made a phylogenetic tree using the available sequences and they do split into 2 branches and x434 ended up on the fumosum branch. I’m not sure what the morphological difference is between decastes and fumosum, but that might be worth looking into so we can support the sequence results.

Created: 2015-05-21 23:05:40 COT (-0500)
Last modified: 2016-05-17 23:22:15 COT (-0500)
Viewed: 46 times, last viewed: 2016-10-24 18:40:32 COT (-0500)
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