甘肃永昌乌拉尔世 Sphenopteris(楔羊齿)新记录: 兼论晚古生代 Sphenopteris多样性及古地理演化*
王雪莲1, 熊聪慧2, 孙柏年2

New records of Sphenopteris from the Cisuralian of Yongchang,Gansu Province,with a discussion on diversity and palaeogeographic evolution of this genus during the Late Paleozoic
WANG Xuelian1, XIONG Conghui2, SUN Bainian2
甘肃永昌乌拉尔世 Sphenopteris yongchangensis sp. nov. 小羽片表皮微细构造特征 a—上表皮在光学显微镜下的特征; b-e—下表皮特征; g,h—下表皮在扫描电镜下的特征; f,i—气孔器形态。标本编号GSYC-LDGSW-2017-100(A,B)