Shiitake mushrooms growing on a substrate log

Shiitake mushrooms growing from a sawdust substrate log, shown at a mushroom industry display in the United States.

Media ID: MF-OPEN-SHIITAKE-MUSHROOM-SUBSTRATE-LOG-USDA-01
Rights: LICENSED
Diagnostic status: not applicable
Record checked: 2026-09-24

Pale brown shiitake caps emerging from a dark brown substrate log in low light.

Technical caption

What this shows

A substrate log is a compressed block of supplemented sawdust, not a tree log. It fruits sooner than natural logs.

Confirmation basis: Subject, location and authorship follow the Wikimedia Commons file record; the image was inspected before publication and no production claim is inferred.

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What this does not prove

This is a real, open-licensed contextual image. It does not establish this platform's farm, operating setpoint, construction specification, diagnosis, yield or commercial result.

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Source class: EXTERNAL OPEN MEDIA
Owner: U.S. Department of Agriculture / Wikimedia Commons
Usage: Public domain; derivative resized and converted to WebP without substantive visual alteration.
Consent: not_required
People visible: No
ML training: Not allowed
Source record: Open source page
Licence: Public domain