Ημερολόγιο της/του javiehweg

A. morbosa only grows on Prunus species. Apparently...
So if it looks like black knot but is on something else... what is it?

Here's just some links I found while trying to ID snails...

CA tide pools: http://californiatidepools.com/snails/
Management plan that includes species list: https://escholarship.org/content/qt4c57b1bc/qt4c57b1bc.pdf?t=p4tdhi
Document put together by the park: https://www.nps.gov/cabr/learn/intertidal-field-guide.htm

https://mycoguide.com/stereum-test/

https://www.inaturalist.org/people/sarahduhon

https://www.biorxiv.org/content/10.1101/2020.10.16.342840v3.full