This is the only plant disease I know of that is caused by an alga. It attacks magnolia, mango, avocado, citrus, guava, and other Florida trees. This one is on a leaf of Magnolia grandiflora.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
https://creativecommons.org/licenses/by/2.0CC BY 2.0 Creative Commons Attribution 2.0 truetrue