Observation 49594: Xerocomellus Šutara

When: 2010-08-03

Collection location: Ladds Addition, Portland, Multnomah Co., Oregon, USA [Click for map]

Who: Richard Bishop (Leciman)

Specimen available

I’ve been observing this sp.in the backyard diverse habitat of another OMS member for a number of years. The habitat is dominated by a large cutleaf birch (not native) but there are many diferent types of plants and the sp. in question occurs in all parts of the yard. It seems to fruit when the weather has warmed enough that watering is necessary. A few days after watering (usually in mid to late July) fruiting commences.

The color and condition of the cap is quite variable depending on age and conditons. Useually it is a reddish to orangish brown when young and moist. From there it may become a purplish red or it may progress to a dull yellowish or orangish light brown (sometimes with a reddish background showing through).

Spores are usually 10-13 × 4.5-5.5, mostly subfusiform but some fusiform and some narrowly elliptical. Spores are olive brown.

No reactions to KOH or Ammonia but FeSO4 turned cap cuticle and stipe base context dark (green?).



Proposed Names

44% (3)
Recognized by sight
Used references: Boletes of Michigan, California Mushrooms, Boletes of North America
Based on microscopic features: Spores fusiform to subfusiform with no discernible ornamentation
57% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Danny Newman (myxomop)
2011-08-08 04:57:26 BST (+0100)

This may be an example of something I brought to a meeting some months (if not years) ago which begot similar befuddlement, no sure ID. Mine were in a Sellwood backyard, fruiting directly beneath a Hydrangea. I remember your mentioning repeatedly seeing some headscratcher of a bolete in Portland backyards found around the same time of year. I’ve got photos of it on a hard drive which has yet to be unpacked. I’ll post an ob. of my own in the near future.

Response to Roy Halling suggestion
By: Richard Bishop (Leciman)
2010-08-15 06:00:55 BST (+0100)

Thanks Roy. I did as you suggested but didn’t find any species that I am convinced are a match. Many had some of the characteristics but none seemed to have all the characters that I have observed. The closest match seems to be X. cisalpinus.

A xerocomoid
By: Roy Halling (royh)
2010-08-04 15:44:51 BST (+0100)

entity based on what I can see of the hymenophore. You might try running it through some European keys to Xerocomus. There was one published in Field Mycology The genus Xerocomus: A personal view, with a key to the British species. Field Mycology 9(3): 77-96, by Alan E. Hills.

Created: 2010-08-04 07:10:57 BST (+0100)
Last modified: 2018-09-21 03:30:13 BST (+0100)
Viewed: 167 times, last viewed: 2018-09-21 06:40:08 BST (+0100)
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