I dont know if you all know your ferns but I have a Pteris in my bathroom, and it is currently producing lots of spores along the underside of its fronds, at the edges.
Unfortunatley they are quite thick and its a job getting a good bit in focus!
A crop to show an individual sorus:
And then I flipped the leaf over, as this has a nice pattern on it, the pattern didnt show but I did see some stray spores!
They must be tiny, smaller than pollen grains as this is 125X!
Pteris sori
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Pteris sori
Canon 5D and 30D | Canon IXUS 265HS | Cosina 100mm f3.5 macro | EF 75-300 f4.5-5.6 USM III | EF 50 f1.8 II | Slik 88 tripod | Apex Practicioner monocular microscope