Schubert’s last string quartet is his most lyrical, but also his most complex. Still played with just four instruments, the scope is closer to a symphony than a string quartet. Schubert finished it in 1826, but it was published after his death as late as 1851. Here it is performed by the Bartholdy Quartet.
A quartet that I know nothing about. I couldn’t find it as well. The first recording of it on Discogs is from 1971, the last around 1983. My guess would be that the name comes from Mendelssohn, who is also referred to by that name. It is not a bad performance at all, and I would have liked to hear more from them.