PRETZ: FLORA OF LEHIGH CoUNTY, PENNSYLVANIA 57 
sylvania, Easton, Northampton County, Lehigh County on the 
South Mountains,Chester, Lancaster, and York counties. Along 
the Lehigh River in Carbon County there are a number of stations. 
ASPLENIUM RUTA-MURARIA L. 
Near Helfrich’s Springs, 24 miles north by northwest of 
Allentown, 1882, Krout. Along the Little Lehigh, foot of 17th 
Street, Allentown, October 2, 1900, Hamm. 134 miles southwest 
of Allentown, October 21, 1900, Dowell 1036. 2 miles southwest 
of Allentown, August 3, 1901. 11 miles west by northwest of 
Emaus, December 22, 1907, 1064. Along the Jordan, 3% mile 
east of Jordan Bridge, October 30, 1910, 3062. Along the Little 
Lehigh, 144 miles northwest of Emaus, November 24, 1910, 3140. 
Near Salsburg Church, 34 mile north of the last, 3142. 
Occurs only on limestone in the valleys of Jordan Creek and 
the Little Lehigh, where it may be expected throughout. Not 
usually abundant excepting in the woods near Salsburg Church 
and at Helfrich’s Springs, where quarrying has done much injury 
to the station. In shaded and exposed situations. Fruiting 
fronds 10 cm. (6+4) long and 3 cm. wide represent maximum 
luxuriance but fruiting fronds 2 cm. long have been collected. 
Fruits in July, but is at its best in fall. Evergreen well through 
the winter, especially the sterile fronds. The species varies in 
the shape and cutting of the pinnules or ultimate segments, from 
narrow and lacerate to broad or round-wedgeshaped and merely 
crenate or toothed. Apparently this species is to be expected 
on limestone in eastern Pennsylvania and on corresponding forma- 
tions in northern New Jersey. 
ASPLENIUM PLATYNEURON (L.) Oakes 
General throughout, on all soils and formations and in all 
situations excepting wet ground. Frequently lining roadsides 
and railroad embankments in abundance but no less frequent and 
abundant in varying situations elsewhere. Sometimes growing 
in the clefts of rocky outcrops. Specimens with fronds 5.1 dm. 
(0.6+4.5) long and 3 cm. wide represent a fair average for lux- 
uriant plants. Collected in fruit on June 26. Sterile and fertile 
fronds lasting well through winter but usually prostrate in 
November. 
