Evolutionary pattern of striations and taeniae in the India Gondwana saccate pollen

Abstract

Striations and taeniae are genetically controlled morphographic characters of sporae dispersae. The sequential pattern of evolution in striations through Lower Gondwana has revealed that the earliest Permian is the starting plane for these characters which proliferate to a diversified and complex mosaic, in the subsequent time, culminating in Late Permian. The global occurrence of striations and taeniae in saccate pollen of Permian-Triassic times is an episode of evolution in organisation which appears to attain the fittest situation for exine protection, germination gates, or moisture regulators.