I was at the San Antonio library today, so I took a look in the Brazos county cemetery book... There are 3 Herrmanns listed, all buried in the Bryan city cemetery, but unfortunately none are your Henrich Wilhelm:
Herrmann, Harry W: b. 9 Jun 1903 d. 20 May 1982
Herrmann, Lebrun Alton: b. 5 Feb 1940 d. 26 Jan 1963
Herrmann, Rosie F: b. 30 Sep 1913 d. 7 Jun 1970
There's a note for each that they're buried together.
There's also two Hermans in the Mt. Calvary cemetery:
Herman, Joe: b. 1884 d. 1953
Herman, Veronika: b. 1887 d. 1981
Again, there are notes that they are buried together.
I checked the birth records book as well, but the only Herman/Herrmann/Herman I could find was the child of Joe and Veronika above, also named Joe. If your Henrich was buried in Brazos county, I'm guessing that it might have been on private land and it hasn't been marked as a known cemetery. It'd be worth checking adjacent counties though. I've found some of my family in Robertson as well.