Orange hairs straight out of calyx

Only when I had pollination occur or to close to a light.

 

Or a cutting I took still had some

 

You could look closely through your plants and see if you see any male parts. Plants can herm but not saying that's the issue. Sometimes could be heat, fan hitting to hard, or maybe even roughing them around. But it is true if you have pollination your pistils will brown, how far along are you?

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I only see it on the very older calyx right at main stem - not bud calyxes.

J

Edit: that is a very old (relatively speaking) pre-flower calyx. The orange pistol is also (again, relatively) old like the calyx.

This is nothing - just an old pre-flower.

J