Observation 214934: Agaricus L.

When: 2015-08-25

Collection location: Mililani, Honolulu, Hawaii, USA [Click for map]

21.4502° -158.0286° 215m

Who: Allen Hoof (allenhoof)

No specimen available

When first observed, there were two white mushrooms, with caps still closed and veils in place. After imaging, the larger was collected and measured. The second was left in situ to be revisited. Within 24 hours, that mushroom had emerged from its veil and was also imaged, collected and measured.

The following description is for the first (unopened) mushroom: Cap bell-shaped, 15 mm in diameter and 13 mm high. Stem club-shaped, 34 mm tall, diameter 8 mm tapering to 6 mm. Gills white, attached, close.

This is the description for the second mushroom: Cap umbonate (knobbed), smooth. Color is light brown, appears cream-colored in the sun. The center has a yellowish tint and the margin is a darker brown, projecting (sterile) and crenate. Diameter is 20 mm. Stem cream-colored, slightly club-shaped with remnant flaring ring. Length 28 mm, diameter 5mm tapering to 4 mm at top. Gills dark brown, close, free.

Observed in a suburban development on a tropical lowland plateau, in grass in a landscaped area at the base of a tree. Except for size, the spotting appears similar to Leucoagaricus leucothites.


The two unopened mushrooms as first observed.
The larger of the unopened mushrooms, immediately after collection.
The larger unopened individual after having been cut open longitudinally.
Second individual, cap open, overhead view.
Second individual, cap open, ground level view.
Second individual after collection, side view, focus on annulus and base of stipe.
Second individual after collection, focus on gills.
Second individual after collection, focus on cap.

Proposed Names

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Created: 2015-08-31 18:57:25 EDT (-0400)
Last modified: 2015-09-02 18:10:19 EDT (-0400)
Viewed: 23 times, last viewed: 2017-06-28 03:37:42 EDT (-0400)
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