NOTES ON THE DISTRIBUTION OF CERTAIN 

 PLANTS IN WESTERN PENNSYLVANIA. 



By Otto E. Jexxixgs. 



In an interesting article in a recent number of the 

 Fern Bulletin Professor E. J. Hill notes the occur- 

 rence of Woodwardia virginica (L.) J. E. Sm. in 

 northwestern Pennsylvania, * and in this connection 

 certain notes from the present writer may not be amiss. 



For the last six years the present writer has been 

 engaged almost entirely upon the study of the flora of 

 Western Pennsylvania, with reference both to the 

 ecologic and systematic phases of the question, and 

 during this period more than a dozen trips of two or 

 three days duration each have been spent in and about 

 the great Pymatuning Swamp in Crawford County 

 about fifteen miles southwest of Saegertown, where 

 Prof. Hill made his headquarters. This great swamp 

 occupies a trough along the southwest shore of a gla- 

 cial moraine and is about seventeen miles long and up 

 to a mile in width, and consists of two portions ; one 

 running west from Linesville to the Ohio State Line 

 and containing considerable almost pure Fraximis 

 nigra — Saururus ccrnuus association, the other run- 

 ning southeast from Linesville with much of very char- 

 acteristic Lari.v lariciua — Sphagnum asociation. To- 

 wards the southeastern end of the latter, the Tama- 

 rack-Sphagum bog, the drainage is reversed and. in- 

 stead of flowing to the northwest by way of the She- 

 nango River, flows to the southeast through Crooked 

 Creek. 



At the headwaters of Crooked Creek, near the little 

 village of Hartstown, there are four glacial ponds, the 

 largest being called Mud Lake, and while studying the 

 vegetation around one of the smaller ponds the writer 



* Hi!!. E. J. Fern Notes. Fern Bulletin. 18:65-76. July, 1910. 



