I have a couple of questions I was hoping someone
could help with....

Given the following two names:

Tillandsia usneoides fo. longissima André, 1889
Tillandsia usneoides var. longissima (André) Mez, 1896

What is the difference between the two? I assume
var. stands for variety, but what does fo. stand
for? Form? Is this a case where the same plant was
reclassified a few years after discovery, or are
they two separate plants?

Thank you for your help,

-N