Hey there thiagobruch,
You can rest your wifes nerves, this is not a dangerous spider at all. It's actually a great bit of free pest control and will do all it can to keep the mosquitoes and gnats from bothering you.
As for the species, all I can say is that it is indeed an orb weaver, family Araneidae. A shot from the other side of the spider might help for further ID. As for the name "garden orb weaver", I think that common name is used by many different people for many different spiders.
Looks like the underside of an Eriophora ravilla (nicknamed the "Tropical Orbweaver"). They are fairly common in Florida and build very large, round webs. Like nearly every spider on Earth, they do possess venom glands and tiny fangs, but they are only dangerous to the insects they eat, not to humans.
Here's a link to the rest of our threads that also have Eriophora ravilla in them: http://www.spiders.us/forums/forumdisplay.php?f=33. They can be variable in color and pattern. Some have white or green on their top side and others are just plain orange.
Yep! I'm glad you mentioned that. :-)
Originally Posted by Whitlock