Are my Marinos dead?

Unfortunately, the jar containing my marimos fell off the desk and shattered on the floor. I wasn’t at home at the time, so I only noticed what had happened when I returned. They may have been on the floor for up to 13 hours without being submerged in water. When I found them, they had developed some brown areas, and I immediately placed them back in water in a jar. Is there any chance they can recover, or are they already dead?