Alisma
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on November 17, 2016
Artillery fungus can only grow on wood outdoors, so it wont grow inside your house. The spores will stick to artificial siding and other materials and leave a stain, but they won't survive there. It is also not harmful to humans or pets.
Here are some questions and answers about artillery fungus:
http://www.personal.psu.edu/users/d/d/ddd2/
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