My first thought was some kind of insect eggs, but then it seemed reminiscent of some kind of fungal fruiting body.

Eggs or fungal fruiting body

  • most likely the remains of insect eggs - whatever was in them has already hatched and gone...the leaf itself, under magnification appears to have whitish grey deposits over it, would have been interesting to see the underside of that particular leaf.
    – Bamboo
    Jun 26 at 14:37

Turns out they are Assassin bug (Reduviidae) eggs

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