Observation 120766: Chlorophyllum brunneum (Farl. & Burt) Vellinga

When: 2012-12-04

Collection location: San Francisco, California, USA [Click for map]

Who: TaxoNerd (Taxo)

No specimen available

Suspected Macrolepiota rachodes

Pileus –
6 – 7cm; convex; having a shaggy appearance; brown patches and scales with white surface revealed underneath, central brown patch on apex of cap 2-4cm; flesh dense, white, staining saffron rapidly upon cutting; odor of commercial button mushrooms.

Stipe –
central; 7 – 10cm long; 1 – 1.5cm thick; white with fibers or hairs on stalk; bulbous, with nearly a 90 degree angle between the stipe and bulb; solid; flesh white turning to saffron when cut; somewhat curved; fibrous inside.

Annulus -
moveable, wide ring on stalk; white, with brown similar to patches on pileus.

Lamellae –
free; crowded to close; white, staining saffron when handled; broad.

Spores –
Spore print white

Habitat –
solitary or gregarious on forest debris under eucalyptus and deciduous trees; Central San Francisco, CA, December 4, 2012, after a week of strong rains, and average, low temperatures for the time of year.

I am always a bit hesitant to use this species for dinner, probably because it was one of the first edibles I came across, and recall reading a lot about its poisonous look-alike, which has green spores. Supposedly, that species can occasionally have so few green spores that the spore print comes out white, and only a few green spores can be seen, and even then only under a microscope. I would love to hear comments on this, especially so I can learn to enjoy cooking with this species.

Proposed Names

6% (2)
Recognized by sight: Shaggy brown/white cap, prominent ring on stalk, pronounced bulbous stem-base, saffron staining where cut
Used references: Mykoweb,
Lincoff (1981)
92% (2)
Recognized by sight: Abruptly marginate bulb at stem base

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
No one has commented yet.

Created: 2012-12-22 02:22:12 PST (-0800)
Last modified: 2014-04-03 17:56:36 PDT (-0700)
Viewed: 28 times, last viewed: 2017-06-15 02:19:17 PDT (-0700)
Show Log