英和和英

出典:『Wikipedia』 (2011/04/18 08:45 UTC 版)

英語による解説

引用

Catenalis is a genus of extinct plants of the Early Devonian (Pragian, around 410 million years ago). Fossils were first found in the Posongchong Formation of eastern Yunnan, China. The leafless stems (axes) bore 10-12 eliptical spore-forming organs or sporangia on side branches. To release their spores, the sporangia split at the opposite end to their attachment to the stem. Its relationships are considered uncertain at present.