The dichotomous or Y shaped branching is seen in sub phylum:

Explanation

The dichotomous or Y-shaped branching is actually seen in the subphylum Psilopsida. It refers to the pattern of branching in the vascular system of certain plants belonging to this subphylum. This type of branching occurs when the main stem divides into two equal branches, resembling the shape of the letter "Y". It's a unique characteristic of Psilopsida plants.