PrETz: FLORA OF LEHIGH COUNTY, PENNSYLVANIA 67 
elsewhere. Varying greatly in length of stipe according to situ- 
ation. Fronds 7.8 dm. (4.3+3.5) long and 1.4. dm. wide represent 
average luxuriance. Collected with ripe fruit on August 4. Her- 
baceous, withering early. 
FILIX BULBIFERA (L.) Underw. 
Moist limestone cliffs, Helfrich’s Springs, 2144 miles west by 
northwest of Allentown, June 21, 1901, Dowell, 1124. 
Moist hillside 144 mile west of Jordan Bridge, July 17, 1901; 
September 2, 1907, 849. Moist shale cliffs 14 mile east north- 
east of Rockdale, August 15, 1908, 7442. 
On the wet shale cliffs in the vicinity of Rockdale along the 
Lehigh River, and northwest to below Slatington, this species is 
not rare. At the Jordan Bridge station it grows abundantly in 
the open on the moist limestone talus slope, but elsewhere in 
generally shaded situations. It may be looked for elsewhere in 
similar situations on these formations. Fronds 5.4 dm. (1.3+4.1) 
long and 1 dm. wide represent average luxuriance. Fruits in 
July. Herbaceous, withering early. 
Fir1x FRAGILIS (L.) Underw. 
Lehigh Mountain, Krout; Laurel Hill, Krout. 
Along first streamlet 14 mile east of Mountainville, June 8, 
1900, Hamm. Wet situation along road 5¢ mile northwest of 
Strassburg, May 4, 1907, Hamm; May 18, 1907, 252. 14 mile 
south by southwest of Kernsville, April 25, 1908, 1078. Wall 
of race, Helfrich’s Springs, 174 miles northwest by north of Allen- 
town, May 5, 1908. Roadside 1 mile west of Emaus, May 24, 
1908. Shale cliffs 44 mile east of Rockdale, April 9, 1910. Shale 
cliffs 114 miles southeast of Slatington, May 5, 1910, 2402. % 
mile northwest of Kernsville, November 6, 1910. 
Not rare at any of the stations given and often abundant. A 
frequent species on the shale cliffs from below Rockdale to below 
Slatington. May be expected in moist situations on the outcrops 
of these formations. Fronds 2.7 dm. (1.2+1.5) long and 7.5 cm. 
wide represent average luxuriance. Fruits late in May. Her- 
baceous, withering early, but fresh growth late in the season often 
lasting well into fall. 
