The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
Are you refering to macro algae? I'm sure someone here can give you the nitty-gritty technical version of it, but I think of it as larger, multicellular plant life. Such as caulerpa, chaetomorpha, mermaid's hair, etc.
In pictures it probably means a macro picture, which is a very very close shot.. Zoomed in real close... Most digitals have a macro mode for close pictures..
so its just a term used in picture taking.. very very close shot of the shroons mouth. JMO..