species identification - Is this a plant or a fungus?

It was soft and covered in flies. My guess is fungi.

Location: South Florida.

Answer

Identified Species: Clathrus ruber

Scientific classification

Kingdom: Fungi

Division: Basidiomycota

Class: Agaricomycetes

Order: Phallales

Family: Phallaceae

Genus: Clathrus

Species: C. ruber

Source: http://en.wikipedia.org/wiki/Clathrus_ruber