Why doesn't Assmbly.GetType() work for generic type instances?

I have a generic class in a separate assembly:

class MyGenericClass<T> { }

In another assembly, I try to do this:

var assembly = System.Reflection.Assembly.LoadFrom(@"C:\path-to\MyClassLibrary.dll");  
var t1 = assembly.GetType("MyClassLibrary.MyGenericClass`1");
var t2 = assembly.GetType("MyClassLibrary.MyGenericClass`1[System.String]");

Now, the first call to GetType will return a generic type, but the second will return null.

I tested doing the same with the List<> type:

var assembly2 = System.Reflection.Assembly.LoadFrom(@"C:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorlib.dll");
var t3 = assembly2.GetType("System.Collections.Generic.List`1[System.String]");

Now, this time it works. The type of List<String> is returned. Which leaves my utterly confused.

Why will GetType() not get my type when called with a type parameter [System.String], when it is able to get the List type when called with the same type parameter?

And is there any other way to get hold of my type? I know I can parse the typename, to extract the parts MyClassLibrary.MyGenericClass'1 and [System.String], and then instantiate the generic type based on these types, but I would probably mess something up along the way, so I was looking for a simpler, solid, built-in way to get this type object.