Yes, I've come about Begonia albococcinea too and found out its not to be found in the entire Brazil. 88 species Begonia for the region Janet!
http://floradobrasil.jbrj.gov....
I've I've looked at the ones they give Herbarium species of,
Begonia gehertii looked like a candidate but the leaf margin is not entirely closed like in mine
A google search gives many photos but now it is clear it cannot be the one..
https://www.google.be/search?q...
Begonia ibitiocensis looks similar except for the lack of hairs on leaves and flower stems, they are not red either..
https://www.google.be/search?q...
the herbarium species looks too much damaged..
http://reflora.cria.org.br/inc...
Ah how about Begonia paulensis..
http://reflora.cria.org.br/inc...
also not..
https://www.google.be/search?q...
