A FLORISTIC STUDY ON THE PTERIDOPHYTE IN SHANDONG PROVINCE OF CHINA

This paper deals with the floristic components,geographical distribution and ecological environments of the Pteridophyte in Shandong. The floristic relationships between Shandong and some other regions are also disscussed. The results show that: 1. The floristic elements are relatively not rich, however, the geographical elements are varied. All the 40 genera can be classified into 10 areal-types, mainly composed of the North Temperate(30.0%), the Pantropical(22.55%), and the Cosmopolitan(20.0%).The areal-types of temperate account for 42.5%, taking a predominant position, while those of tropic account for 37.5%. 2. Endemism is remarkable, 12 species of Pteridophyte, which make up 11.3% of the total numbers, are endemic to this province. 3. The geographical distribution is fairly uneven, The number of species are decreased from South to North and from East to West. 4. The similar quotents of Pteridophyte flora between Shandong and Liaoning, Beijing, Henan, Qinling, Japan, Hainan, Xizang are 46.4%, 45.3%, 41.2%, 26.0%, 24.8%,4.7%, 3.8% respectively in sequence order. This means that this flora is most similar to Liaoning, and then to Beijing and Henan.