No. 517] 



MIOCENE TREE, 



:;r» 



2. Ginkgo.— Represented in the Mascall by a fragment 

 not specifically determined. This genus is not known 

 in the Rocky Mountains later than the Laramie and Liv- 

 ingston, on the border line between the Cretaceous and 

 Tertiary. As is well known, there is a single living 

 (Asiatic) species. 



3. Thuites.-A fragment not specifically determined. 

 It is practically identical with T. eh rcusirdrdi Heer 

 (Miocene of Sacbalin and Spitzbergen), but that plant 

 appears to be referable to the modern genus Chanurcy- 



4. (ihjiitostrobus. - \ genus still living in China. It 

 was supposed to occur at Florissant, but I believe the 

 material so referred all belongs to Sequoia, 'file Mascall 

 material is not above suspicion of also being Sequoia; 

 indeed Lesquereux so referred one of the specimens. 



5. Taxodium— The Mascall specimens are referred by 

 Knowlton to the widely distributed T. distich um mio- 

 cenum Heer, which should be called Taxodium distichnm 

 dubium = Taxodium dubium (Sternb.) Heer, originally 

 described from Bilin. This differs from Sequoia by the 

 deciduous leaves, which are not decurrent at the base as 

 in Glyptostrobus. The genus still lives in our southern 

 states. 



6. Artocarpus.— Represented by very fragmentary 

 material, doubt fully referred to A. calif oniica Kn. 



7. Magnolia. — Major Bendire collected a plant which 

 Knowlton says "may well be" .1/. ingle field i Heer. It 

 has not been obtained by recent collectors. Magnolia 

 dayana Ckll. ined. (M. lanceolata Lx. 1878, not Link. 

 1831) is listed by Knowlton as from the Mascall, but in 

 his detailed account he says it is from Cherry Creek, 

 which should be Lower Eocene. 



8. Laurus.— Florissant has a species of Persea; Laurus 

 and Persea are allied, and not distinctly separated by 

 paleobotanists. 



9. Platanus.— The Mascall specimens appear to belong 



