Ulmus furcinervis (Borsuk) Ablaev is first recognized and described in the Paleocene Wuyun flora from Heilongjiang Province, China. The combination of key characteristics for identification of these leaf specimens is ...Ulmus furcinervis (Borsuk) Ablaev is first recognized and described in the Paleocene Wuyun flora from Heilongjiang Province, China. The combination of key characteristics for identification of these leaf specimens is that they have craspedodromous secondary veins forked near the leaf marginal, tertiary veins percurrent and marginal teeth convex. Specimens formerly described as leaves of Planera cf. microphylla auct. non Newberry and Sorbaria wuyunensis Tao et Xiong in Wuyun flora are reexamined and assigned to U. furcinervis.展开更多
文摘Ulmus furcinervis (Borsuk) Ablaev is first recognized and described in the Paleocene Wuyun flora from Heilongjiang Province, China. The combination of key characteristics for identification of these leaf specimens is that they have craspedodromous secondary veins forked near the leaf marginal, tertiary veins percurrent and marginal teeth convex. Specimens formerly described as leaves of Planera cf. microphylla auct. non Newberry and Sorbaria wuyunensis Tao et Xiong in Wuyun flora are reexamined and assigned to U. furcinervis.
