The medium is Lowenstein-Jensen. I remembered it from grad school as the pale green media in test tubes poured and set on a slant to increase the surface area. I found a supplier for the media at
link with pictures that match what I used in grad school. I'm nearly 40 years past grad school now and handling M. tuberculosis is now rated as a BSL 2 or BSL 3 activity. Our school labs were really not built to those standards in the mid-70's.
Thanks. I got to thinking about it and did recall mention of the slant test tubes in biology 101, 50 years ago. I took a microbiology course about 4 years ago and we used only the petri dishes & standard agar.
I feel like making ice cream now.