Infested Mossy Stone Bricks
minecraft:infested_mossy_stone_bricks
A placeable block. Made using a Mossy Stone Bricks rather than crafted directly.
How to get it
No direct recipe — it's made using a Mossy Stone Bricks:
Crafting (shapeless) 
→
Mossy Stone Bricks
Crafting (shapeless) 
→
Mossy Stone Bricks