I read in National Council for Education and Training study guide (NCERT) that Planaria (flat worms) undergo true regeneration. Fungi, filamentous algae and protonema of mosses multiply by fragmentation.
In Planaria (flat worms), we observe true regeneration, i.e. a fragmented organism regenerates the lost part of its body and becomes a new organism. The fungi, the filamentous algae, the protonema of mosses, all easily multiply by fragmentation.
What is the difference between fragmentation and true regeneration?