Pham-Hoang Ho Herbarium (PHH) which named after a Vietnamese botanist Phạm-Hoàng Hộ (1929-2017) to dedicate his significant contribution to flora of Vietnam. PHH storages thousands of plant specimens representing both historical documentation and invaluable records in the past and present for botanical researches. The collection of about 5000 plant specimens was gathers by Pham Hoang Ho and his colleague, both Vietnamese and foreigners were arranged in the higher plant collections. The cryptogam collections at PHH are the largest collections of Vietnam on lichens, bryophytes, pteridophytes.