Observation 194060: Clitopilus hobsonii (Berk. & Broome) P.D. Orton

When: 2014-12-18

Collection location: Bon Tempe Reservoir, Marin Co., California, USA [Click for map]

Who: Ron Pastorino (Ronpast)

No specimen available

These were growing on a dead standing tree, probably oak.
Caps up to 3.7 cm across and soft.
Spore print a pinkish tan and definitely not white.
Spores not amyloid.
Spores ~ 6.1-7.2(7.8) X 3.8-4.4 microns, elongate(Qave. = 1.73) and smooth.
Spore color and spore size seems to eliminate Cheimonophyllum candidissimum.
12-21-2014 edit; Interesting that I’ve found this specie before,(http://mushroomobserver.org/159207), in the same area and completely forgot about it.

Species Lists


Basidium in Congo red + KOH
Spores in Cotton Blue @ 1000X.
Spore with Congo red +
Spore with Congo red +

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Add Comment
Added 3 photos of spores
By: Ron Pastorino (Ronpast)
2014-12-22 04:09:23 GMT (+0000)

with Cotton Blue and with mixtures of stains.
The ridges can be seen and even the facets when the spore is in polar view.
Clitopilus hobsonii is becoming more feasible.

No gill cystidia found.
By: Ron Pastorino (Ronpast)
2014-12-20 04:38:14 GMT (+0000)

Added another spore photo and a typical Basidium, ~ 24 X 7 microns.

I’ve added a photo of the spore print,
By: Ron Pastorino (Ronpast)
2014-12-20 03:52:10 GMT (+0000)

(the red streaks on the right are from Congo red) and it is pretty representative of what I see except for lacking just a tiny bit more of a pinkish hue. However, it is more brownish than pink.
I’ll try to see if I can see any gill cystidia from what I can salvage from the trash can.
The spore match for Clitopilus hobsonii isn’t ideal.

Clitopilus hobsonii…
By: Richard Kneal (bloodworm)
2014-12-20 01:38:35 GMT (+0000)

definitely, looks promising…

Only other
By: Christian (Christian Schwarz)
2014-12-20 01:05:58 GMT (+0000)

species I would suggest looking into is the taxon we have been
calling Clitopilus hobsonii – especially because I think I see some
longitudinal ridges on the spores.

this is driving me nuts…
By: Richard Kneal (bloodworm)
2014-12-20 00:15:33 GMT (+0000)

can you look for cystidia and clamp connections?
do you have a photo of the print?
would you call the print “pink” or “brown?”

Created: 2014-12-19 20:55:44 GMT (+0000)
Last modified: 2014-12-23 01:58:45 GMT (+0000)
Viewed: 152 times, last viewed: 2018-02-28 03:54:26 GMT (+0000)
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