BOSTON 
JOURNAL OF NATURAL . HISTORY. 
VOLUME VI.— NO. IV. 
Anr. XXV.— New Species of. Fossil Plants, from the An- 
thracite and Bituminous Coal-fields of Pennsylvania ; 
collected and described by Leo Lesquerevx. i 
Introductory Observations by Henny Darwin Rocers. 
Tur following new species of fossil plants, one hundred and 
ten in number, are some of the results of a systematic investi- - 
gation of the fossil flora of the carboniferous strata of Penn- 
Sylvania and the adjacent coal-fields of Ohio and Virginia, 
undertaken three years ago by my able assistant in this de- 
Partment of the geological survey of Pennsylvania, Leo Les- 
eiim Esq., formerly of Switzerland, now of Columbus, 
Ohio. ; 
à By far the greater part of the specimens were collected by 
himself, and these are now in our possession. A few of the 
new species were first seen and studied by him in the rich 
local cabinets of Mr. Clarkson, of Carbondale, and of the Rev. 
W. Moore, of Greensburg, to whom our best thanks are due 
for their liberality in thus opening their collections for the de- 
scription of what was new. Many of these hitherto unde- 
scribed forms were discovered in the slates, associated with the 
JOURNAL B. S. N. H. 53 AUGUST, 1854. 
