How to register converter for a generic type?

MyTree.cs

using Python.Runtime;

class MyNonGenericTree
{
}

PyTypeConversion<MyNonGenericTree>.Converter = tree => ...;

class MyTree<T>
{
   ...
}

PyTypeConversion<MyTree<???>>.Converter = tree => ...;
//                      ^ what should I put in place of '???' so that my generic trees would be converted automatically ?