DMR's two documents give two picking sizes. The farmer folder calls the cap mature at 5 to 6 cm; the 2011 manual harvests at 7 to 8 cm diameter. Pick by twisting with thumb and finger, then trim the soiled stem base with a clean knife.
ICAR-DMR reports a biological efficiency close to 100 percent, about one kilogram of fresh mushroom per kilogram of dry straw. That is a reported figure, not a promise.

