Final answer:
Horsetail (Equisetum) is the eusporangiate fern that produces sporangia in a terminal cone-shaped structure at the top of the plant.
Step-by-step explanation:
The type of eusporangiate fern that produces a sporangium on top in a cone is the Horsetail (Equisetum). Horsetails are part of the class Equisetopsida within the phylum Monilophyta and are the only surviving genus of the once extensive group of plants known as Arthrophyta. These vascular plants are characterized by photosynthetic stems, very small scale-like leaves, and usually bear no branches except for a terminal cone-shaped structure, where spores are produced. This cone is essentially a cluster of specialized spore-bearing leaves. Spores are released with the help of structures known as elators and are dispersed by the wind.