184 



the palo amarillo region, and mingled with the latter species, is 

 probably another member of this group. 



The properties of the palo amarillo rubber are peculiar. Taken 

 by itself it is of only medium quality, but mixed in suitable 

 proportion with other varieties, especially with Para rubber, it 

 markedly improves them. 



TWO NEW FOSSIL PLANTS FROM FLORISSANT, 



COLORADO* 



By T. D. A. COCKERELL 

 POLYPODIACEAE 



Hypolepis coloradensis n. sp. 



Pinnules about 2^ mm. long, oblong or obtusely subtriangular, 

 connected basally, and bearing two to four large round marginal 

 sori, which as preserved are very dark in color. In general 

 structure and appearance, the plant closely resembles Hypolepis 

 repens (L.) Presl, as figured by Shimek in Bull. Lab. Nat. Hist. 

 Univ. Iowa, IV (1897), pi. v, f. 4. The more usual forms of 

 Hypolepis have only one or two sori to the pinnule, but no doubt 

 the earlier condition is one in which they are numerous, as in 

 Adiantum. 



Habitat. — Miocene shales of Florissant, Station 14; frag- 

 ments only. The genus is to-day common in the West Indies 

 and Central America. 



Caesalpiniaceae 

 Bauhinia pseudocotyledon n. sp. 



Leaf circular in outline, or nearly so, 16 mm. long and 18 

 broad, as preserved dark in color, apparently thick ; the median 

 sinus about 6 mm. long, its sides, except apically, very close 

 together ; venation indistinct, but with a lens it is possible to see 

 clearly a mid-vein running to the sinus, and two strong laterals, 

 as shown in the figure ; petiole short, about 2 mm., twisted to 

 one side. From its dark color, apparent thickness, and obscure 

 venation, I thought at first that this was a cotyledon, probably 

 of IpojHoea, possibly of some Sterculiaceous plant related to Pen- 

 tapetes. A closer scrutiny shows, however, that the venation 

 will not accord with these. In the seedlings there appears to be 



* Illustrated with the aid of the Catherine McManes fund. 



