532 MESOZOIC FLORAS OF UNITED STATES. 



PoDOZAMiTES PEDiCELLATUs Fontaine. 



PI. CXIV, Fig. 1. 



1889. Podozamites pedicelJatus Font.: Potomac Flora (Monogr. U. S. Geol. Surv., 

 Vol. XV), p. 180, pi. Ixxvi, fig. 1; pi. Ixxviii, fig. 7; pi. Ixxxii, fig. 5. 



The single specimen of this plant collected b}^ Professor Ward on 

 June 13, 1891, is well characterized. It is the lower part of a detached 

 leaflet that is well preserved and shows a considerable portion of the 

 pedicel that attaches the leaflets of this plant. It is shown in PI. CXIV, 

 Fig. 1. 



POPULOPHYLLUM MINUTUM Ward." 



PL CVIII, Fig. 11. 



Sapindopsis variabilis Fontaine. 



PL CXW, Fig. 2. 



1889. Sapindopsis variabilis Font.: Potomac Flora (Monogr. U. S. Geol. Surv., Vol. 

 XV), p. 298, pi. cli, figs. 1, la; pL clii, figs. 1, 4, 4a; pi. cliii, fig. 3; pi. cliv, 

 figs. 2-4, 4a; pi. civ, figs. 2-5. 



This is the most common and best-preserved fossil found at 

 Hosiers Blufl^, 92 specimens occurring in the collections. Most of the 

 specimens, however, are fragments of leaves. No doubt if excava- 

 tions had been made and time devoted to the search for fossils a greater 

 variety as well as more and better specimens might have been secured, 

 not only of the Sapindopsis forms, but of others. 



The terminal leaflets of Sapindopsis show a decided tendency to 

 union at their leases. This is especially true of the uppermost three. 

 One specimen of S. variabilis obtained on November 25, 1891, shows 

 a marked departure from this rule. This is composed of the basal parts 

 and most of the last three leaflets. They are not attached to a stem, 

 but stand in their natural position, indicating a former attachment. 

 These leaflets are not confluent at their bases, as shown in PL CXIV, 

 Fig. 2. 



« See p. 499. One specimen from Rosiers Blufif has an impression of a small dicotyledonous leaf which 

 Professor Fontaine labeled Populus potomaceiisis without any mark denoting doubt. He did not, however, 

 include that species in the plants enumerated in his manuscript as found at that locality. Although a 

 smaller leaf still than that from the Mount Vernon beds, the form and nervation are substantially the same, 

 and there seems no doubt that this species persisted in the Aquia Creek period. The specimen was collected 

 on November 2.5, 1891.— L. F. W. 



