This fine animal is in the genus Ocrepeira. There are only two species in the east in this genus but an amazing 65 species from south of the border. A large number of species are distributed at altitude in the Andes mountains of South America. The four US species are globosa, ectypa, georgia and redempta. Species globosa being mainly western and redempta in extreme south Texas only. See Tom Murray's fine shots of O. ectypa here. And the detailed paper here

 

Impressive shot of the spider in resting camouflage position. Looking amazingly like a knob on this woody stem. Note the spider is facing away from us.