Step 1: Concept
Somatogamy
Step 2: Meaning
A sexual process in certain fungi where two individuals of different mating types fuse to form a dikaryotic cell.
Step 3: Analysis
Physarum and Agaricus are saprophytic fungi, while Puccinia is a rust fungus. Albugo is an oomycete, not a true fungus. Only Agaricus exhibits somatogamy as it involves the fusion of two different mating types to form a dikaryotic hypha.
Step 4: Conclusion
Agaricus is the only option that can exhibit somatogamy based on its sexual process.
Final Answer: (C)