---
title: "Saw this on a hike. Anyone know what this is? Leaves with horns!!"
description: "Saw this on a hike. Anyone know what this is? Leaves with horns!!"
url: "https://getplanta.com/community/lZ7uAE3pQ86jnFGxrCwLrg/64b55e9c87bf055a14f981f4"
community: "Anything about plants"
author: "Plant Daddy"
published: "2023-07-17T15:30:36.29Z"
language: "en"
image: "https://images.getplanta.com/v1/resize/uv8vm5m4HJ3pCM0ocPpMkSVeyej9VISHebpVX2cRkVI/6849206ba5a145efaa2cfef821ae63d1.webp?size=large"
---

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# Saw this on a hike. Anyone know what this is? Leaves with horns!!

_Posted by Plant Daddy on 2023-07-17_

Saw this on a hike. Anyone know what this is? Leaves with horns!!

![Attachment 1 of 1](https://images.getplanta.com/v1/resize/uv8vm5m4HJ3pCM0ocPpMkSVeyej9VISHebpVX2cRkVI/6849206ba5a145efaa2cfef821ae63d1.webp?size=large)

## 7 comments

### Annai C. commented on 2023-07-17

Those are "horns" like tumors. It happens when something irritates them or gets into them. 😑

### exitJiraffe commented on 2023-07-17

My guess is parasitic. Looks like it’s growing off of the leaf, and not on it. My guess is if you cut those conical parts open, you’d find larva inside. Very cool.

### Mara commented on 2023-07-17

Yes, they are galls. I had a hackberry tree removed because it was a magnet for woolly aphids and it’s leaves were covered in galls.

#### Rhonda replied on 2023-07-17

Yes, galls. It can happen in the woody parts too. The ones I’ve seen on stems, branches, and trunks are rounded and look like huge warts.

#### Mara replied on 2023-07-17

Yeah it’s pretty gnarly looking. Even the berries were all deformed. Kinda gross.

### Plant Daddy commented on 2023-07-17

So fascinating!

#### Mara replied on 2023-07-17

These woolly aphids were cool though. If I moved a branch, they would float in the air like pieces of fuzzy white lint.

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