In the survey of epiphytic algae on the tree in Shanghai,Chlorokybus,a newly recorded genus in China was observed.The main morphological characters of the newly recorded species of it (Chlorokybus atmophyticus) was described in detail.Based on the discussion of its systematic position,we found that C. atmophyticus was a special algae which played a significant role in the evolution of land plants.We suggest that it should be treated as a separate order-Chlorokybales.