There aren't any male-line descendants living, that we know of.
The only people with a paper trail are the Somersets. They share a failrly recent common ancestor, and beyond that, a long single strand back to Edward III. Four of them were tested by the Richard III team. One didn't match the other three, and none of them matched Richard III. We don't know why not, but obviously the odds favour the break being somewhere in that long single strand. So exit the Somersets as the last male-line Plantagenets.
The Warennes shared the Y genes, and the old books say the surname Warren comes from the Warennes. But the Warren DNA project doesn't seem to have a match for either Richard or the Somersets, and nobody has published a solid paper trail (though some dubious and fake connections are in circulation). More likely the surname Warren mostly comes from the old given name Warin.
