528 REPORT— 1898. 



*Prunus sp. Stone of fruit. 



*Potamogeton natans, Linn. 



*Quercus acuminata, Roxh. 



*Quei'cus discolor, Ait. 



"*Quercus macrocarpa (?), Michx. 



Salix sp. 



Sedge and grass leaves. 



*Tilea americana, Linn,. 



Ulmus americana, Linn. Fruit and leaves. 



*Ilobinia pseudacacia, Linn. 



Gaol Hill. 



*Carya alba, Nutt. 



*Festuca ovina (?), Lirm. Spike. 



tHypnum sp. 



Grasses and mosses in fragments. 



*Tilea americana, Linn. Leaves and fruit. 



*Robinia pseudacacia, Linn 



TJlmus americana, Linn. 



A feature of special interest in the leaf specimens is to be found in 

 the recurrence of very good specimens of Acer pleistocenicum. When 

 this leaf was obtained from the Don some years since, the one imperfect 

 specimen led to the belief that a new species had been found. OtheV and 

 somewhat more perfect specimens from these later collections prove the 

 correctness of the original diagnosis, and show that the species as a new 

 one must stand. 



From these general results it appears that our previous list has been 

 •extended by a total of eighteen new species, giving a total of eighty-one 

 species now known, -while three species occur in new localities. 



Of the species the identity of which is to some extent in doubt, and 

 which require more ample material for final conclusions, it may be observed 

 that Fraxinus quadrangulata of an earlier list, represented by wood only, 

 may be F. sambucifolia. Similarly, Quercns rubra and Q. alba, repre- 

 sented by wood only, may be Q. discolor and Q. macrocarpa respectively, 

 these last being represented by leaves. So long, however, as there is a 

 reasonable probability that these various species occur, so far as may be 

 gathered from the characteristic features of the specimens, they must 

 stand in the list provisionally, their validity being determined by future 

 examinations of additional material. 



Turning to the extent of the flora represented by the material studied 

 up to the present time, I find the whole number of species for the vai-ious 

 deposits examined to be as follows : — 



Compared with 



Don, 

 Identical species. 



Don Valley . 35 



Green's Creek and i-esserer's 21 2 



Scarborough Heigl.ts 14 2 



Montreal 6 .S 



Moose River 5 2 



