58  Pretz: FLorA oF LEHIGH CouNTY, PENNSYLVANIA 
The writer knows of no species that is more evenly distributed 
in the county. On limestone and especially shale it tends to 
become serrate, and forms with not only some of the pinnae of 
the fertile frond serrate but the sterile also, are not rare. (On 
“shale” along Jordan Creek 14 miles northwest of Kernsville, 
November 6, 1910, 3096.) 
Mr. E.S. Mattern found a plant on Hardyston sandstone along 
the Little Lehigh River, 134 miles west by northwest of Emaus, 
near Salsburg Church, which corresponds to the named variety 
Hortonae.* This plant grew true for two seasons and when 
collected (July 17, 1908, 1351) had three fronds of fertile form fully 
expanded, averaging 2.4 dm. (0.4+2) long and 3 cm. wide, but 
quite sterile, a correlated character of the variety as originally 
described. 
ASPLENIUM TRICHOMANES L. 
General on shale and limestone outcrops, not infrequently 
locally abundant. Has been recorded sparingly by the writer 
on Hardyston sandstone on the South Mountains 114 miles 
(March 28, 1908) and 1 mile (October 16, 1909, 2299) southwest of 
Mountainville, and on Shawangunk sandstone at Lehigh Gap 
(January 19, 1908, 1069). Fronds 19 cm. (3+16) long and 1.2 
cm. wide represent maximum luxuriance, as do rosettes 17 cm. 
in diameter. Fruits in July. Evergreen. 
In the county the species is ‘“common”’ on the shale and lime- 
stone but rare on other formations. In the mountains to the 
north in the vicinity of the Lehigh River, the writer has found the 
species very infrequent. 
ATHYRIUM ACROSTICHOIDES (Sw.) Diels 
Frequent and abundant in boggy places and along streams on 
the South Mountains. Occurs on shale 1g mile south of Saegers- 
ville (July 7, 1907, 586), along the creek 5< mile east of Hoffman . 
(May 16, 1909), and at the base of the cliffs along the Lehigh River 
above Rockdale (May 16, 1909). Also in Lower Milford Township, 
13g miles southwest of Locust Valley, in the vicinity of a branch 
of East Swamp Creek (July 17, 1910, 2666). It may be expected 
throughout. Fronds9.8 dm. (3.5+6.3) long and 2.1 dm. wide rep- 
resent average luxuriance. Heavily fruitedin shade by August 6 
but has been collected in fruit as early as July 13. Herbaceous. 
* Asplenium ebeneum Hortonae Dav. Rhodora 3: tr. pl. 22. 2 Ja toot. 
