Armillaria ostoyae References Armillaria ostoyae fungus Ask Anything Homework Help Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: Armillaria/ Largest specimens…that year, a specimen of A. ostoyae was identified on Mount Adams, in southwestern Washington state. Its age was estimated at 400 to 1,000 years, and it far exceeded the Michigan fungus in size, covering some 607 hectares (1,500 acres). Read More…that year, a specimen of A. ostoyae was identified on Mount Adams, in southwestern Washington state. Its age was estimated at 400 to 1,000 years, and it far exceeded the Michigan fungus in size, covering some 607 hectares (1,500 acres). Read More