作 者 ：Geng Bao-yin, Zhu Wei-qing
期 刊 ：植物分类学报 1994年 4期
Keywords:Early Devonian,
Abstract:
Drepanophycus spinaeformis Goeppert is a plant of world-wide distribution in
the Lower Devonian. Although this species has been reported from numerous localities, it is
far from being understood well, because the fertile material is rare. Observation on speci-
mens from the Danlin Formation of Guizhou showed that the sporangia were borne on short
stalks attached laterally to the axes near the leaf axil, nearly sphaeroid, and smaller than
Rayner’ kidney sporangia. Howerer, other character, e. g. banded nutritive axis bearing
spiral drepanoid leaves, perforated tracheid wall, are the same as those described by Rayn-
er. We agree with Rayner in raising Drepanophycales to the status of class, Drepanophy-
copsida, parallel with Zosterophyllopsida and Lycopsida. The systematic position of
Drepanophycopsida is in between Zosterophyllopsida and Lycopsida. The class includes one
order, one family and three genera (Drepanophycus, Baragwanathia and Asteroxylon).
The fertile parts of the plant are reported for the first time in China.