Q.Does This Look Like Rhizoctonia?
Our staghorn fern lives outdoors in Southern California. It gets watered every 1-2 weeks. Sometimes I will put it out to receive rain water. The bottom fronds are curled and browned. The frond on the far right has light brown freckling. There are no new green shield fronds, only new Antler fronds. Thank you in advance!

Certified GKH Gardening Expert
It is possible that it does not have enough humidity. This article will help with the care of the plant: https://www.gardeningknowhow.com/ornamental/foliage/staghorn-fern/staghorn-fern-information.htm