Observation 79792: Chlorophyllum brunneum (Farl. & Burt) Vellinga

When: 2011-10-17

Collection location: University of Washington, Seattle, King Co., Washington, USA [Click for map]

Who: BlueCanoe

No specimen available

Found at the base of a giant sequoia (Sequoiadendron giganteum) in wood chip mulch and needle litter. Repeat fruiting at same location (within 10 feet) as observation 67075. See also observation 97113.

Species Lists


Taken 7 days later — not the exact same mushroom but within a foot or two

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Someone should tell svims.ca to fix the error.
By: Britney Ramsey (Riverdweller)
2011-10-23 17:18:39 PDT (-0700)

There is no Chlorophyllum aeruginosa.

Having said that, erasing that error and assuming they meant C. rachodes, the key is in fact complete.

By: Daniel B. Wheeler (Tuberale)
2011-10-23 16:17:11 PDT (-0700)

key cited is not inclusive. While it mentions a description of C. rhacodes, it is not included in the key, and therefore is exclusive for that species.

Many keys are that way. Take a look at the keys Arora offers in Mushrooms Demystified, for example. At least Pacific Key Council mentions both species, as well as C. agaricoides and C. aeruginosa, which many keys totally ignore. In their defense, at least the species are mentioned with descriptions.

I mention this because I believe from reading your notes that you may be becoming one of those few, Briney. I hope so.

It is possible that only C. brunneum is associated with S. giganteum. The only Chlorophyllum I find in my area with S. giganteum is C. brunneum. But C. brunneum I have also found with Pinus, Tsuga and Deodor cedar in a neighbor’s lawn. Such data makes key creation so difficult as to be unmanageable. Many key makers (and mushroom finders) ignore the plant species nearby. This is unfortunate.

Good notes for collections must include nearby trees and shrubs. If the fungus is obviously growing from leaf litter, such as S. giganteum, it should be noted in the observation. Just my 2 cents worth. Many many mushrooms collectors do not know what nearby tree and shrub species are, thus relegating species specificity to the few, the detailed, the … retentive. (Like me?)

Without such detailed information, knowledge that certain fungi are species specific would still be unknown.

An example: the original collection of Tuber gibbosum by H. H. Harkness noted it was found in a “mixed stand” of conifers and hardwoods a few miles from San Francisco. It wasn’t for another 70 years that someone noticed it seemed to be more common under Douglas-fir stands. Another 10 years passed before finding abundant collections under pure Douglas-fir. T. gibbosum is now known to be species specific with Douglas-fir. It’s only taken 130 years or so.

Why is that important? Other Tuber species are also found with oak, hazelnut, oceanspray, Cascara, chestnut, basswood, and other hardwoods; and still other species are commonly found with Pinus species. To rule out other mycorrhizal host species, multiple collections with detailed host species nearby have to be made over time, and the collections preserved for the future in herbaria.

Tedious and time consuming? You betcha! Scientific knowledge is often that way though. Curious too in that S. giganteum at the University of Washington is WAY out of it’s naturally occurring area. Maybe C. brunneum is being spread along with ornamental plants, in the same way Amanita phalloides seems to be spreading along with chestnut planting up the West Coast.

C. brunneum because
By: Britney Ramsey (Riverdweller)
2011-10-23 15:01:53 PDT (-0700)

of that single sided membranous ring.

NOT BECAUSE it stains any color of orange, red, or brown. Brunneum, rachodes, and olivieri all stain some version of brown, red, orange, saffron.

Here’s the key,

C. brunneum
By: Daniel B. Wheeler (Tuberale)
2011-10-17 23:57:06 PDT (-0700)

quickly stains brown or reddish-brown when scratched near the base of the stipe. C. rhacoides in my experience, which is not great, is often much darker brown on the entire stipe, and remains so even after sectioning or drying.

Created: 2011-10-17 21:04:49 PDT (-0700)
Last modified: 2012-06-11 17:37:30 PDT (-0700)
Viewed: 111 times, last viewed: 2018-04-20 12:18:56 PDT (-0700)
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