ART. 22 TERTIARY FOSSIL PLANTS FROM ARGENTINA BERRY 17 



The present species is not uncommon in the collection studied. In 

 the existing flora Nothofagns extends northward on the wetter 

 Chilean side of the Andes to about latitude 33°. 



Occurrence. — Southeast side of Rio Nirihuao near Casa Piedra, 

 about 12 miles south of Lago Nahuel Huapi, Territory of Rio Negro. 



Plesiotypes.—Q2it. No. 37862, U.S.N.M. 



Order RANALES 



Family ANONACEAE 



Genus ROLLINIA St. Hiliare (?) 



ROLLINIA (?) PATAGONICA. new species 



Plate 2, Figure 11 



Leaves of small size, ovate-elliptical in outline, widest medianly, 

 with a narrowly rounded apex and a cuneate base. Margins entire. 

 Texture subcoriaceous. Venation obsolete, due to carbonization of 

 the lamina during fossilization. Length about 4.5 centimeters. 

 Maximum width about 2.25 centimeters. Petiole short and stout, be- 

 tAveen 5 and 6 millimeters in length. Midvein straight, relatively 

 stout and prominent. Secondary and tertiary venation not visible. 



It is rather hazardous to attempt an identification of this leaf as 

 representing the genus Rollinia. It agrees rather well with the exist- 

 ing Rollinia parvifolia of northeastern Argentina. The genus 

 has about a score of existing species of shrubs and trees in the warmer 

 parts of South America. A single fossil species not very different 

 from the present form has been described from the Pliocene of 

 eastern Brazil. ^'^ 



Occurrence. —B\\\fi about I1/2 miles south of Mata Amarilla, Upper 

 Rio Clialia, Territory of Santa Cruz. 



Holotype.—Cdii. No. 37863, U.S.N.M. 



Order ROSALES 

 Family SAXIFRAGACEAE 



Genus HYDRANGEA Linnaeus (?) 



HYDRANGEA (?) INCERTA, new species 



Plate 5, Figure 2 



Leaf oval in general outline, with a rounded apex and a truncate or 

 broadly cuneate base, widest below the middle. Margins somewhat 



« HoUick and Berry, Johns Hopkins Studies in Geology, No. 5, p. 52, pi. 2, fig. 4, 1924. 



