TUSCOLA COUNTY I67 



south and southeastern part and about or near most of them arc tama- 

 rack-black spruce swamps, many of them having escaped destructive 

 fires. Among these are Spruce Lake, west of Fostoria; Murphy's Lake. 

 southwest of Mayville; Cat Lake, north of Mayville; Hays Lake in 

 Dayton Township; Cedar Lake, and Long Lake. Along the Saginaw 

 Bay shore temporary ponds are often formed by wave action and tin 

 gradually fill up and become marshes, or wet prairie-like land. 



Range of Some Plants Extended 



A few plants, mostly peculiar to prairie-like regions farther south 

 and west, have appeared in the northern part of Tuscola County 

 native or at least long established. Prominent among these are Silph nun 

 terebinthinaceum L., prairie dock; Vernonia illinoensis Gleason, Drum- 

 mond's iron-weed; Liatris spicata (L.) Willd., gay feather; Cacalia tvbe- 

 rosa Nutt., tuberous Indian plantain; Lythrum alaium Marsh, wing- 

 angled loosestrife; Acerates floridana (Lam.) Hitchc, Florida milkweed: 

 and Asclepias sullivanlii Engelm, Sullivant's milkweed. 



Acknowledgments 



The writer is much indebted to Mr. Kenneth K. Mackenzie of New 

 York City for an examination and determination of the sedges and other 

 difficult and doubtful plants and to Prof. A. S. Hitchcock, agrostologisl 

 of the United States Department of Agriculture, for a determination 

 of some of the grasses. 



Annotated List 

 POLYPODIACEAE. Fern Family 



Phegopteris drijopteris (L.) Fee. Oak fern. Rich open dryish woods. 

 Frequent. 



Adiantum pedatum L. Maidenhair. Frequent in rich woods along 

 streams and about the small lakes. 



Pteris aquilina L. Common brake. Common and abundant on dry 

 ground or in swamps. 



Asplenium aa^ostichoidesSw. Silver spleenwort. 'Wells and Dayton 

 townships in rich woodlands." C. A. Davis. 



Asplenium filix-femina (L.) Bernh. Lady fern. Very common in 

 low open or shaded ground. 



Polystichum acrostichoides (Mich.) Schott. Christmas fern, [ts 

 favorite place on bluffy shaded banks of streams. Noticed in particular 

 on the shaded bank of a small stream running into Murphy's Laki 



Aspidium thelypteris (L.) Sw. Marsh shield-fern. Very abundant on 

 low marshy shaded or open ground, especially about the small lakes. 



