For C. virescens,
leaf spots are usually on the upper leaf surface, raised,
velvety in appearance, in shades of orange or brown.
Leaf spots caused by C. parasiticus on guava are topdown,
full-thickness necrosis, destroying both epidermal
layers (abaxial and adaxial) and all intervening tissues.
The bright but relatively sparse but brilliantly pigmented
orange algal bloom occurs on the undersides of leaves,
rather than the upper.