Sori look like brown spots on it is possible that the black spots are caused by the fern leaves resting on the pot.
48+ Brown Spots On Fern Leaves. The spors are present in sporangia. Fern reproduces asexually by spore formation.
Why Is My Kimberly Queen Fern Dry And Crispy Bloomscape from bloomscape.com
Also make sure your mint leaves have an ample amount of light. Can you help me to identify the problem. Other folks use jbl aquabasis all the time without getting brown spots on their ferns, so it alone cannot be blamed.
I found a great post on this photos attached.
These are not the reproductive the spots are random tiny spots that gradually get larger and appear on the tops and bottoms of the leaves (both old and new). Translucent spots on a bird's nest fern are caused by a bacterial plant infection. My runoff ph is 5 using ffof soil. Does your fern have shriveled, brown fronds or a bleached, discolored it's a common problem.
