What shrooms are these?

[dan_chi]

They grow after rain on my front yard in Chicago and there is plenty of them. These are already old, maybe 5 days. Are they edible?

[Tasso]

If there are any ash trees nearby I'd say these are so-called ash tree boletes. They are edible, but not very good. See here:http://www.mushroomexpert.com/boletinellus_merulioides.html

[dan_chi]

Yes, they look like these in your link. They grow next to this tree

[Tasso]

That's an ash tree alright. Lucky it survived. Most ashes in Chicago area have been killed by the emerald ash borer. If there are any dead branches near the top, it is doomed.

[dan_chi]

Thank you. There are some but the tree looks healthy. Next time the shrooms grow I'll cook a soup.

[dan_chi]

What about these? They grow on my backyard where there is no ash tree. Are they a different species or they are just young? They seem to have longer stalks are caps are almost red

[Dave W]

The Ash Tree Boletes seen in the earlier post (Boletinellus meruloides). This mushroom is actually a parasite on the larvae of an insect that feeds upon the roots of the ash tree. Not rated very highly as an edible.

The small red ones in the latest post are a species of Hortiboletus. Formerly, these were placed in genus Boletus. But DNA analysis has indicated that there are a few species that occupy a branch on the evolutionary tree and deserve their own small genus. Three possibilities for the species are: Hortiboletus campestris, H. rubellus, H. harrisonii. These are difficult to tell apart.

http://www.mushroomexpert.com/boletus_campestris.html

[dan_chi]

Thanks. The latter one does live in the neighborhood of an oak as your article indicates. When cut it turns faintly blue within 30 seconds, then after few minutes it turns yellow again. Which one of these three you mentioned would you guess it is and why?