About 7 tiny spots of rotting tissue were found on the underside of the leaves. Each rotting spot consist of a very dark center spot (< 1 mm across) surrounded by a translucent, yellow-brown, circular region (~ 2 mm across). These spots do not show up clearly on the upper leaf surfaces; the rots started on the underside and have yet to spread through the leaves to reach the upper surfaces.
The leaf rots could be due to be splashes of tiny water droplets from the sphagnum moss surface when it was watered at a steep angle. The electric fan was not used to dry up possible water droplets on the leaves for this particular watering as it was done extremely carefully to avoid water falling on the leaves and I was over-confident that this was the case. The lack of air circulation in my balcony due to closed windows could also have contributed to the rotting.
These rotting spots will be left untouched to be observed for progress.
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