Experts have confirmed that the fossilised plants are liverworts , a simple species which has no roots or stems .

在这里输入译文专家已经证实这些植物化石是一种没有根和茎的原始苔类。

Fossils found : modern liverworts are one of the oldest known species of plant , thought to have evolved from algae .

发现的化石：现在的苔类是已知的最古老的一种植物，可能进化自藻类。