NO. 2151. FOSSIL PLANTS FROM FLORISSANT— KNOWLTON. 247 



well preserved. The reference of this to DryoiHeris must be con- 

 sidered doubtful. 



Family PSILOTACEAE. 



TMESIPTERIS ALLENI (Lesquereux) Hollick. 



Tmesipteris alleni (Lesquereux) Hollick, Bull. Torr. Bot. Club, vol. 21, 



1894, p. 256, pi. 205, fig. 12. 

 OpMoglossum alleni Lesquereux, Ann. Kept. U. S. Geol.and Geogr. Surv. Terr., 



1872 [1873], p. 371. 

 Salvinia alleni (Lesquereux) Lesquereux, Kept. U. S. Geol. Surv. Terr., vol. 



7 (Tert. Fl.), 1878, p. 65, pi. 5, fig. 11. 



This is one of the most characteristic plants foimd at Florissant, 

 and while not actually abundant, is present in almost every collection 

 from there and is always perfectly preserved. It is regularly ellip- 

 tical in shape with a pronounced emarginate apex and excun-ent 

 midvein. The nervation is peculiar in that there is the strong mid- 

 vein, between which and the margin there is a very coarse reticulate 

 arerolation. Not one of these leaves, so far as known to the writer, 

 has ever been found attached, nor has a trace of fruit been observed, 

 though if correctly referred to this modem genus, the fruit might 

 fall off and not be recognizable thereafter. 



The single living species of Tmesipteris (T. tannensis), which is 

 widely distributed throughout Australia, New Zealand, Tasmania, 

 and the Polynesian islands, has drooping branches thickly beset with 

 small linear decurrent leaves which are either sharply apiculate or 

 emarginate with the midvein excurrent. The nervation consists of a 

 very strong midvein and a very fine reticulate areolation between it 

 and the margin. 



Broadly speaking the fossil form resembles the living in the emar- 

 ginate, excurrent apex and in the manner of areolation, but it differs 

 widely in shape, manner of attachment of the leaves, and in the very 

 coarse reticulation. It seems doubtful if they are congeneric, 

 though they may belong to the same family. 



Family PINACEAE. 



PINUS FLORISSANTI Lesquereux. 



Pinus florissanti Lesquereux, Rept. U. S. Geol. Surv. Terr., vol. 8 (Cret. and 

 Tert. FL), 1883, p. 138, pi. 21, fig. 13. 



The Hambach collection contains a single cone that is referred to 

 this species, but it is much less perfect than the type. Pinus floris- 

 santi was established by Lesquereux for a finely preserved, nearly 

 perfect cone, and so far as known to the writer, no specimen has been 

 obtained which in any way connects this type of cone with the leaf- 

 bearing specimens, though doubtless one of them was the species 

 which bore the cone. 



