串珠藻目的现代地理分布和起源

对串珠藻目的现代地理分布和可能的起源进行了初步分析。初步确定串珠藻目植物的现代地理分布中心在东亚和东南亚地区 ,北美和大洋州是两个次分布中心。推测串珠藻目植物可能的起源地在古北大陆和古南大陆相连接的地区 ,可能的起源时间在三叠纪之前。文中对串珠藻目植物可能的起源和散布途径也作了推测 ,对其现代分布格局及成因也进行了初步分析

Modern Geographical Distribution and Origin of Batrachospermales

A preliminary analysis on modern geographical distribution of Batrachospermales and its possible origin were made.The modern geographical distribution center of Batrachospermales is located in East Asia and Southeast Asia,while North America and Oceanica form two secondary distribution centers.Based on the analysis,it is presumed that Batrachospermales possible originated in the boundering area of ancient Gondwanan and Laurasian continents.The possible orgin time of Batrachospermales could have been traced back to earlier than the Triassic Period.It was also discussed that the possible ways of origin,the possible routes of dispersal,the modern distribution pattern and the factors resulted in this formation of Batrachospermales.