Not to be contrary, but that is not so. I am also of the opinion that actually we are thinking along the same lines. The only affilliation we can see from this photo is that his battalion was assigned to the 56th Landsturm Brigade.
Let's let Joe explain it, shall we?
Here is a link to Col J's Landsturm Article.
http://www.pickelhauben.net/articles/Landsturm.html
When the German military was ordered to mobilize August 1, 1914, the Landsturm Battalions began being formed & mobilized too. There were 334 Landsturm battalions established. Of these 142 were considered "mobile". The battalions that fell under the Bezirkskommandos were administratively grouped into brigades that followed the peacetime brigade boundaries of the Army Corps District. So the number of battalions per brigade varied greatly. The determining factor was how many battalions were located inside the geographic boundaries of the brigade area. This brigade assignment can be easily identified in pictures as the individuals wore metallic Arabic numerals or “Collar Dogs” to display brigade affiliation, starting in 1914.
This was an administrative brigade number, and did not reflect an employment capability. There was no brigade for the Landsturm as in a commander and a staff. They were administratively grouped into brigade organizations only because they were administered by the Army Corps District which was itself broken down into brigades. You will see Brigade collar dogs which would remain in service until regulations were changed on 14 April 1915, and the Brigade numbers were eliminated.
An AKO regarding Landsturm was issued on 14 April 1915, authorizing the Landsturm to do away with the Brigade collar dog devices, and authorizing new collar dog devices, with the Armee Korps in Roman numerals and Btln. numbers in Arabic numerals. These can be seen as applied A.K. numbers above and to the side Btn. numerals, and the gilt/brass devices are displayed in all manner of styles and sizes, what ever was available. It appears to have been up to the interpretation of individual Btlns.