出典:Wikipedia
出典:『Wikipedia』 (2011/06/24 03:19 UTC 版)
Dicroidium is an extinct genus of fork-leaved seed ferns that were distributed over Gondwana during the Triassic (251 to 200 million years ago). Their fossils are known from South Africa, Australia, New Zealand, South America and Antarctica. They were first discovered in Triassic sediments of Tasmania by Morris in 1845.