Side opening? I don't think I've seen anyone mention this, but I think it might be a sparkling dew drop. It's common for dewdrops to sit on moss and many other plants.
Dewdrops sometimes sit on the top, sometimes they hang from the underside:
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Here's a drawing and photo of Reseda (wild mignonette) that shows the leaves:
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Dewdrops sometimes sit on the top, sometimes they hang from the underside:
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Here's a drawing and photo of Reseda (wild mignonette) that shows the leaves:
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