Sorus
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A sorus is a cluster of sporangia in ferns and fungi. A coenosorus is a compound sorus composed of multiple, fused sori.
The underside of a fertile frond of Dicksonia antarctica. Each circular brown structure is an individual sorus.
Sorus of Phlebodium aureum
Scattered sori
Linear sori
Prothallus
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A prothallus, or prothallium, is usually the gametophyte stage in the life of a fern or other pteridophyte. Occasionally, the term is also used to describe the young gametophyte of a liverwort or peat
Prothallus (prothallium) of the fern Polypodium vulgare seen under a light microscope.
Prothallus of the tree fern Dicksonia antarctica (note new moss plants for scale)