What kind of tissue is the forerunner of long bones in the embryo

Hyaline cartilage.

Explanation:

Tissue are ensemble of specialised cells that perform functions.

Cartilage is a smooth and translucent tissue.

Hyaline cartilage is a glass like, transluscent cartilage found in the surfaces of joints. It is pearl grey like in color. It is normally found at the end of long bones of ribs, larynx and trachea. It has a lot of collagen