Microbiology All the following are true about piedra except A Piedra is nodule formation on hair shaft B White piedra is caused by piedrae hortae C Piedrae hortae is a phaeoid fungus D Piedrae hortae produces reddish brown colonies 💡 Explanation All the following are true about piedra except ✓ Correct Answer: B. White piedra is caused by piedrae hortae