Observation 83073: Tricholoma griseoviolaceum Shanks

No cheilocystidia; spores 6-7 × 4(-4.5)µm; septa without clamps; pileipellis with encrusted pigmented hyphae
Herbarium Specimen: UBC F25259 [2011-11-17]
Additional herbarium collections used in this MO observation: UBC F25242 [2011-11-10] and F25263 [2011-11-25]
See also
MO Observation # 190669:
http://mushroomobserver.org/190669 and
MO Observation # 190358:

Species Lists


Encrusted hyphae from pileipellis (2011-11-23 collection)
Encrusted hyphae from pileipellis (2011-11-23 collection)
Encrusted hyphae from pileipellis (2011-11-23 collection)
Earlier collection, Observatory Hill, 2011-November-10
Earlier collection, Observatory Hill, 2011-November-10
Collected at the same site 2011-11-25
Collected at the same site 2011-11-25

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By: Oluna & Adolf Ceska (aceska@telus.net)
2011-11-30 22:59:34 CST (-0500)

It was growing in predominantly Pseudotsuga menziesii forest with some Arbutus menziesii and also Oregon White Oak (Quercus garryana). With the exception of two trees, there is no pine (Pinus contorta) on Observatory Hill. In view of the fact that Dimitar Bojantchev’s newly described Cortinarius xanthodryophilus also occurs on southern Vancouver Island with our deciduous oak http://www.ou.edu/cas/botany-micro/ben/ben444.html#2 , Tricholoma griseoviolaceum cannot be excluded. On the other hand, it would be a new species for BC and Canada and we would not accept it without any further study and confirmation by a specialist.

By: Douglas Smith (douglas)
2011-11-30 19:49:09 CST (-0500)

Where did you find this? Any notes on the habitat? The first photo kinda bothers me a bit, the stipe and gills just look too white there. There is a split between T. portentosum and T. griseoviolaceum down here in California. Where is there is a definite split in the two in habitat, T. portentosum is under pine, and T. griseoviolaceum is under coastal live oak. But also T. griseoviolaceum when young has a very white stipe and gills, pure white as white paper, and T. portentosum has an off-white yellowish stipe. Your first photo has an awfully white stipe, but that might be an artifact of the photo on the blue-grey background. Your notes at least have the yellow cast to the stipe and gills.

I don’t know how far the range of T. griseoviolaceum is, it seems to only be in the range of California coastal live oak. It would be interesting to see it up further north.

Created: 2011-11-23 05:49:32 CST (-0500)
Last modified: 2014-11-30 17:56:11 CST (-0500)
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