Oak apple - Wikipedia
Galls on Oak Leaves and Twigs | Horticulture and Home Pest News
The Cool and Unusual — San Diego Canyonlands
Oak tree 'galls' are fairly harmless
What Are Oak Galls - Learn About Oak Apple Gall Treatment | Gardening Know How
Oak Galls
The Magic of Oak Galls — honey folk clothing
Don't eat the wildlife!
Are your oak trees infected with oak gall? - American Tree Experts
Whole Oak Galls - Botanical Colors
47. What are those? Oak Galls — Rhyne Designs Landscape
What Is Wrong With My Tree? Gouty Oak Gall
Oak Galls and Mistletoe: Nature's Decorations - The Real Dirt Blog - ANR Blogs
Blame Wasps And Squirrels For All The Oak Leaves On Your Lawn | STLPR
How Wasps Make Beautiful and Complex “Oak Apples” | Brandywine Conservancy and Museum of Art
Brown balls on oak trees aren't harmful | San Luis Obispo Tribune
Oak Galls and Mistletoe: Nature's Decorations - The Real Dirt Blog - ANR Blogs
Tree galls are rarely cause for concern - Forestry
🔥 You know those brown balls that grow on oak trees? They're called galls, and can occasionally be pink and translucent. : r/NatureIsFuckingLit
Home, Yard & Garden Newsletter at the University of Illinois
What Are Oak Apple Galls? | Gardening Question - New England
Growths on Oak Leaves and Twigs :: Melinda Myers
Nature: Sonoma County is bursting with galls
