Thanks everyone for the info. It has been 50s°f during the day and 30°- 40°f at night. Here's the pics, first 3 are of the one with black on it. 4 girls total.
Thank you for the info. Is there anything I should look for over the next week(s) like the black color spreading etc. It has been quite cold (50°f - 60°f) and wet too idk if that could be related.
Are there any other signs that could rule out fungus?
No sprays, not crispy or soggy, doesn't come off when rubbed. Plant is the smallest. Under a foot so if it had to be killed no biggie. No signs of black stuff on others