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When: 2008-11-22

Collection location: Santa Rosa, Sonoma Co., California, USA [Click for map]

Who: Debbie Drechsler (debdrex)

No specimen available

Several fruitings on a very old Fraxinus sp. Dark brown bruising of the white pores leads me to this ID.

11/24/08 Sadly, I’ve misidentified the tree which isn’t an ash (Fraxinus). It has aromatic leaves, like Bay, but is over 100 ft (30.5m) tall. I’m still working on ID but I’m guessing this would nullify Irene’s ID of the mushroom.

11/25/08 The tree is officially the largest Umbellularia californica I’ve seen. That would make this polypore most likely to be Ganoderma applanatum.

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Brown spores
By: Debbie Drechsler (debdrex)
2008-11-25 16:43:24 CST (-0500)

You can see them in the first two photos below the fruiting body. According to Mykoweb G. applanatum is especially common on Umbellularia californica in our area.

Many hosts
By: Irene Andersson (irenea)
2008-11-25 14:59:41 CST (-0500)

Perenniporia fraxinea is easy to tell apart from Ganoderma by its white spores, so checking the spores would be the first thing to do.

Perenniporia fraxinea is probably more common in the US than in Europe, where it’s reported from Aesculus, Castanea, Celtis, Eucalyptus, Fagus, Fraxinus, Gymnocladus, Juglans, Olea, Malus, Platanus, Populus, Prunus, Robinia, Quercus, Salix, Ulmus..