1) Cardiograptus
心笔石属
2) Paracardiograptus
拟心笔石属
3) Tutcheria
石笔木属
1.
The systematic positions of these three genera Pyrenaria,Tutcheria and Parapvrenaria have been studied in this paper based on these data of mopohology, embryology,palynology and anatomy.
）、石笔木属（ＴｕｌｃｈｅｒｉａＤｕｎｎ）和拟核果茶属（ＰａｒａｐｙｒｅｎａｒｉａＨ。
4) Cyrtograptus
弓笔石属
5) Galeograptus
盔笔石属
6) Nemagraptus
丝笔石属
