Merosporangia developing from the vesicle of Syncephalastrum (not a mycoparasite).
Sporangiole is the term used to describe a small sporangium. Merosporangium is just a specialized form of a sporangiole. In Syncephalastrum and Syncephalis the sporangioles grow finger-like and radiate from a swollen vesicle at the apex of the sporangiophore (stalk). The sporangiospores develop to form a linear seeries inside the sporangiole.