C# IsGenericType not working as I expected

In the following code we have two classes, the Parent class uses generics:

abstract class Parent<T> 
{
    public T Put(T id, char value) 
    {
        return id;
    }
}

class Child : Parent<int> 
{
    public string Get(Guid guid) 
    {
        return "aei";
    }
}

But using reflection IsGenericType on the id parameter we get False...
I think that should be True, right?

Here is my test code:

public static void Main(string[] args)
{
    foreach (var methodInfo in typeof(Child).GetMethods())
    {
        if (!methodInfo.IsVirtual && methodInfo.GetParameters().Length > 0) 
        {
            Console.WriteLine(methodInfo.Name);
            foreach (var param in methodInfo.GetParameters())
            {
                Console.Write("  " + param.Name + " IsGenericType=");
                Console.WriteLine(param.ParameterType.IsGenericType);
            }
        }
    }
}

And output:

Get
  guid IsGenericType=False
Put
  id IsGenericType=False
  value IsGenericType=False