102 
the flora of the county, at the present time. In observing the 
plants growing in this region it is particularly noticeable that 
many of the species are not natives of the soil but have been intro- 
duced from other lands. The seeds have been scattered through 
the importation of products from other states and countries, and 
we find to-day that about twenty-five per cent. of our flora is 
exotic. Through changes of physical environments some of our 
indigenous species have become extinct in this locality. Even 
some of the localities have become extinct as will be noted by 
the reference to plants found on Calypso Island. This island 
comprised about twenty acres of woodland and was situated in 
the Lehigh river at Bethlehem, a part of it being in Northampton 
county. About seven years ago its large and beautiful trees 
were cut down and the island dug away and the south channel 
of the river filled in to become the roadbed of a railroad. 
In the following list grateful acknowledgment is made to Dr. 
Porter's Flora of Pennsylvania for many species noted therein as 
having been found in the county; also to Mr. John A. Ruth and 
Mr. George W. Caffrey both of Bethlehem who have kindly 
furnished notes from their herbaria. The writer's herbarium 
contains a majority of the plants noted. 
OPHIOGLOSSACEAE 
OPHIOGLOssUM VULGATUM L. Professor Englemann had a specimen collected 
y E. Durand at Bethlehem in 1853 with small Кас fronds; most of 
the plants, however, were pepe (Bull. Torrey Club 24: 548. 1897.) 
ш н oq dni (L.) Sw. In woods on Lehigh Mt. Variable in 
ги OSMUNDACEAE 
OSMUNDA REGALIS L. In marshy ground alon: ng mountain streams on Lehigh 
Mt. about one mile from South Bethlehem at an altitude of about 940 fort. 
earth 
soil on Lehigh M Ме; -also along t the Lehigh river. Common. May 0, 1897. 
OSMUNDA CLAYTONIANA L. In pen woods on Lehigh Mt. and in Voss Daci 
with the preceding. May rds Hio. 
POLYPODIACEAE 
ONOCLEA SENSIBILIS L. Along the banks of the еВ гіуег апа осет 
сгее n mois on igh Mt. July 15 
MATTEUCCIA STRUTHIOPTERIS (L.) Todaro. E ed by Mr. H. W. Pretz 
as having been found нф the Hokendauqua creek = near N azareth, but 
now extinct at these places. vue Tues Club 38: 
STAEDTIA PUNCTILOBULA (Michx.) Moore. On a hillsides, Lehigh 
Mt. Growing in patc 
DRYOPTERIS ACROSTICHOIDES M MD Kuntze. On rocky hillsides and in 
woods on Lehigh Mt. June 5, 
