Fertile hyphae that bear spores are called conidiophores sporangium gametophytes isogametes

The correct answer is:

conidiophore

This is what the lesson says:

Reproduction among the fungi can occur both asexually and sexually. Asexually, fungi can reproduce by fission, fragmentation, budding, and producing spores. Spores are common reproductive structures among fungi. These spores can be carried by the wind, giving the stationary fungus the ability to spread its offspring over great distances. Molds reproduce by spores. A fertile hypha that bears spores is a conidiophore.