Abstract
The pteridophyte flora of Thailand is reviewed from the standpoint of phytogeography. It is evident that the so-called Himalayan elements are predominant in the northern mountainous area and Malesian species are many in the Peninsular, although a distinct fall of flora cannot be determined except for the broad area of the Central plain where few species of pteridophytes grow. Using the distinct distributional pattern of our materials, the phytogeography of the pteridophytes is briefly summarized with special reference to tropical flora. Some examples are given concerning the taxa whose vicariants are found in contrasting areas. Several species are treated, considering the speciation of taxa and their distribution. Detailed interpretation must await further study.
