Please do not re-click a link while waiting for a page to load. (It’s slower and degrades site speed for all users.)
To get images for machine learning, see MO Images for Machine Learning


Large cluster of stalked polypores that looked much like faded brown Laetiporus sp. at first glance. The tan colored cap and large, visible pores- and the fact that they are very fresh specimens proves otherwise. Fruiting from a large conifer stump with salal bushes.

Could either be Albutrellus sp. or Osteina obducta. 5th image shows specimen I brought home with yellow discoloration on pore surface and white spore print on the table top.

Proposed Names

33% (2)
Used references: Mushrooms Demystified (Polyporus, Albatrellus key) pg. 555
56% (1)
Recognized by sight: New name for the Western North American “Bondarzewia mesenterica”, which is not the same as the European species.
Used references: Chen, J., Cui, B., He, S., Cooper, J. A., Barrett, M. D., Chen, J., … & Dai, Y. (2016). Molecular phylogeny and global diversity of the remarkable genus Bondarzewia (Basidiomycota, Russulales). Mycologia, 108(4), 697-708.

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
Osteina obducta
By: Alan Rockefeller (Alan Rockefeller)
2011-09-20 23:44:16 PDT (-0700)

I don’t think this is Osteina obducta – The pores are too large and the cap surface is the wrong color.