These bracket fungi were found on a decaying hardwood trunk in a tropical rainforest of Costa Rica, at about 1300 meters elevation.
They are spongy/rubbery with a woody stem. Slightly tacky/sticky to the touch.
Small round pores visible on top. Bruising an orange-ish color.
Young mushrooms appear pale yellow and somewhat bulbous... more mature ones have a bright orange color to rim and on the underside.
They remind me of varieties of Ganoderma... but so far I have not been able to make a positive ID.
Fresh odor, no bitter flavor.
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You are in a Tropical Rain Forest. Many species few individuals. May or may not even be known to science yet. I would talk to one of the naturalists at INBio in San Jose. They might be able to help. http://www.inbio.ac.cr/en/default.html