4 NATURAL HISTORY AND TOPOGRAPHY OF GROTON, MASS. 



Climbing Ferns, have been almost exterminated by man for 

 decorations. The following species may be found in Groton : 



Polypody Fern. Polypodium vulgare. Rockwood's pasture. 

 July I. 



Maidenhair. Adiantum pedatum. Moist woods and hillsides. 



July 4- 



Common Brake. Pteris aquilina. Meadows. August i. 



Cliff- Brake. Pellaea gracilis. Black Pond. July i. 



Pellaea atropurpurea. Rockwood's pasture. July. 



Chain Fern. Woodwardia Virginica. Ayer road. July. 



Maidenhair Spleenwort. Asplenium Trichomanes. Rockwood's 

 pasture. July. 



Spleenwort. Asplenium ebeneum. Rockwood's pasture. July. 



Silvery Spleenwort. Asplenium thelypteroides. Rockwood's pas- 

 ture. July. 



Lady Fern. Asplenium Filix-foemina. Quasoponagon meadows. 



July. 



Walking-Leaf. Camptosorus rhizophyllus. By river. July. 

 Beech Fern. Phegopteris polypodioides. Woods. July. 

 Phegopteris hexagonoptera. Woods. July. 

 Phegopteris Dryopteris. Woods. July. 



Shield Fern. Aspidium Thelypteris. Quasoponagon meadows. 

 August. 



Aspidium spinulosum. Woods. July. 



Aspidium intermedium. Rockwood's pasture. July. 



Aspidium Booth. Rockwood's pasture. July. 



Aspidium cristatum. Quasoponagon meadows. July. 



Aspidium Clintonanum. Quasoponagon meadows. July. 



Aspidium Goldianum. Quasoponagon meadows. July. 



Aspidium marginale. West Groton road. August. 



Christmas Fern. Aspidium acrostichoides. Rockwood's pasture. 



July. 



Bladder Fern. Cystopteris bulbifera. Woods. July. 



Sensitive Fern. Onoclea sensibilis. Quasoponagon meadows. July- 



Onoclea Struthiopteris. Woods. July. 



Woodsia obtusa. Black Pond. July. 



Woodsia Ilvensis. Rockwood's pasture. June. 



Dirksonia pilosiuscula. Quasoponagon meadows. July. 



Lygodium palmatum. Climbing Fern. Nashua River bank. 

 September. 



