Shiitake is the second most cultivated mushroom globally and arguably the most flavor-dense of the everyday species. Its umami comes from unusually high levels of guanylate, which multiplies the savory hit of glutamate when the two meet — drying intensifies this dramatically, which is why dried shiitake outperforms fresh in broths. The leathery caps want long, confident cooking; the stems are too woody to eat but make superb stock. Traditionally grown on inoculated hardwood (oak) logs that fruit for years after a cold-water shock, though most commercial supply now comes from supplemented sawdust blocks.
Smoky, woodsy, profoundly savory; dried it becomes almost meaty-bacony.
Cultivated year-round; log-grown crops flush seasonally in spring and autumn.
Cultivated; rarely foraged. Tan-to-dark-brown cap often with white cracking, white gills, white spore print.
Always cook thoroughly before eating, and try only a small test portion of any species new to you.
No dangerous look-alikes commonly reported in range -- but always verify your own ID before eating.