I sent the picture on to a member of a Romanian Historical Military Reenactment Group who sent me an email back.
...those which are wearing cavalry boots, I believe are not Romanian.
si care poarta cizme de cavalerie, cred ca nu sunt romani.
The Iron Guard had been shut down and restricted. The uniforms of the Iron Guard were completely different (no cap, etc.)
Garda de Fier fusese desfiintata si interzisa. Uniformele Garzii de Fier erau complet diferite (nu aveau boneta, etc.)
They have epaulets and pants of different colors than those of [regular] uniforms, which were not still used in the Romanian Army. Their caps should have just one button in front, but it isn't clear [in the picture]. Romanian Schutzenschnur were thinner and shorter, also they were not worn very much during the war.
Au epoleti si pantaloni de culoare diferita de cea a uniformei, ceea ce in armata romana nu mai exista. Bonetele ar fi trebuit sa aiba un singur nasture in fata, dar nu se distinge. Schützenschnur era mult mai subtire si mai scurta la romani, iar in timpul razboiului nu prea s-a mai purtat.
He will talk to some others and let me know if he gets any more information on the uniforms/identity of the soldiers in the picture.