Observation 132819: Stropharia rugosoannulata Farl. ex Murrill

When: 2013-05-01

Collection location: Silver Spring, Montgomery Co., Maryland, USA [Click for map]

Who: John S. Harper (jsharper)

No specimen available

In woodchips. After significant rain. Day time temperatures mid 60’s. Occurring in groups, occasionally connected at base, but not cespitose.

I am unsure of the identification because cap cuticle become extremely scaly with age. Young specimens wine colored or brown, smooth, rounded – would be typical for S. rugosoannulata. Scaly cap suggests it might be S. kauffmannii. But the ring and stipe look more like S. rugosoannulata (smoother stipe below ring, prominent grooved ring, cogwheel veil on buttons.

Cap 4-19 cm, bell shaped, becoming flat, perhaps split, upturned on edges, smooth at first, in age becoming very scaly; Cuticle dark purple brown, turning buff/tan in age.

Stipe 1-4 cm x 8 cm, smooth lightly striated at first, becoming rough and peeling in age; Narrower toward apex, white mycelium at base.

Ring – Thick ring, grooved above, split flaring cog below; attached about 75% of the way up the stipe.

Context under cuticle cream yellow becoming whiter near apex of stipe and nearer gills. Hollow spot at connection of stipe and cap context. Stipe context white, solid, slightly cottony at base

Gills – slightly attached becoming nearly free in age; close, grey lilac becoming darker with age, becoming wavy/crinkled in age.

Spores – dark purple brown.

Odor – mushroom, not unpleasant, not prominent.

Taste – not notable, not unpleasant.

I will keep this for a few days, and provide a specimen for study if requested if you get back to me soon.


Cap – scaly in age
Gills – somewhat ragged in age
Close up of ring – split cogwheel below (note also rough stipe)
Ring close up
Gill view of older large specimen; rough peeling/splitting stipe
Cap scaly mature
Cap developing scales – intermediate between young smooth and old scaly
Uputurned in age (might not be same type of mushroom)
Split cap
Split cap – underside

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Created: 2013-05-01 20:31:37 PDT (-0700)
Last modified: 2013-05-03 11:09:14 PDT (-0700)
Viewed: 65 times, last viewed: 2018-11-13 23:03:02 PST (-0800)
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