AET. 22 TERTIARY FOSSIL PLANTS FROM ARGENTINA BERRY 23 



Order MYRTALES 

 Family MYRTACEAE 



Genus MYRCIA De Candolle 



MTRCIA NITENS Engelhardt 



Plate 3, Figures 1-9 



Myrcia (Cryptomyrcia) nitens Engelhardt, Abh. Senok. Naturf. Gesell., vol. 16, 



Heft 4, p. 679, pi. 10, fig. 7, 1891. 

 Myrtiphyllum bayualense Dusen, Svenska Exped. till Magellansland., vol. 1, 



No. 4, p. 103, pi. 11, figs. 7-9, 1899. 



This species was described by Engelhardt from the lower Miocene 

 of Coronel, Chile. It is exceedingly abundant in all sizes in the 

 present collection, and the larger leaves (such as those shown in 

 figs. 7-9) are identical in every respect with Engelhardt 's Chilean 

 type. With these, and grading to much smaller but otherwise simi- 

 lar leaves, are a series of forms identical with those from southern 

 Patagonia which Dusen described as 3fyrtiphyUu7n hagualense. 

 Every gradation of size is represented in the present collection, and 

 there can be no doubt but that a single botanical species is 

 represented. It might possibly be argued that Dusen's, which come 

 from over 11° farther south, were normally smaller, because of the 

 possibly more severe climatic conditions. Among the leaves re- 

 corded by Dusen ^* from the Tertiary of Seymour Island, Antarctica, 

 there is an apical fragment {Phyllites species 16) which very prob- 

 ably represents this same species. 



OcGW'rence. — Four km. west southwest of Bernal, 12 miles south- 

 east of Barriloche, Lago Nahuel Huapi, Territory of Rio Negro. 



Pleswtypes.—QyX. No. 37872, U.S.N.M. 



Order GENTIANALES 



Family APOCYNACEAE 



Genus APOCYNOPHYLLUM Unger 



APOCYNOPHYLLUM CHALIANUM, new species 



Plate 5, Figure 5 



Leaf oblong, acutely pointed at the apex and base. Margins entire. 

 Texture coriaceous. Length about 11 centimeters. Maximum width 

 about 3.25 centimeters. Petiole stout, about 2.25 centimeters in 

 length. Midvein stout, prominent. Secondaries thin, numerous, 

 diverging from the midvein at wide angles, subparallel, ending in an 

 aerodrome marginal vein parallel with and close to the leaf margins. 



2* Dusen, P., Schwed. Sudpolar-Exped., vol. 3, Lief. 3, p. 18, pi. 2, fig. 10, 190S. 



