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A few months ago I asked a what kind of plant my office plant is and how to take care of it. I got a clear answer on that recently, but I just discovered orange spots on some of the leaves (NOT ALL!).

I've made 2 photos to give you a clearer idea of what I mean.

Does someone know what those spots are (and if they are dangerous or something)? And does it need some kind of a cure?

Detailed view

enter image description here

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I can't get a close enough image to examine the spots thoroughly, but because they're evenly spaced, its most likely these are sporangia, or spore cases. It's a sign of a healthy plant and the spores are produced as part of the reproductive process.

Rust infection can be a problem on these plants in some areas, but the orange spots are randomly spaced, so if the plant seems otherwise very healthy, they're spore cases.

http://beyondthehumaneye.blogspot.co.uk/2009/11/polypody-fern-with-golden-sporangia.html

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    Yes, they are spore cases. – kevinsky May 30 '16 at 12:14

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