54 Bicknell : Ferns and flowering plants of Nantucket 



size and luxuriant growth in Trot's Swamp and in wet thickets 

 in Squam and Polpis ; cranberry bog thicket near Long Pond. 



Dryopteris cristata (L.) A. Gray. 



Occasional. Open sphagnum bog by Reed Pond ; near Long 

 Pond ; frequent or even common in Trot's Swamp and in Polpis 

 thickets ; near head of Tom Never's Swamp. 



Dryopteris spinulosa (Retz.) Kuntze. 

 Frequent. Common and of luxuriant growth in Trot's Swamp 

 and in boggy thickets about Polpis ; head of Tom Never' s Swamp ; 

 small plants on Coskaty. 



Dryopteris intermedia (Muhl.) A. Gray. 



Occasional. Common and of large size in Trot's Swamp and 

 in Polpis thickets ; head of Tom Never's Swamp. 



Dryopteris Boottii (Tuckerm.) Underw. 

 Near head of Tom Never's swamp ; at several places in Trot's 

 Swamp and in Polpis thickets, always in close association with D. 

 spinulosa and D. cristata. 



Dennstaedtia punctilobula (Michx.) Moore. 



Low open thicket near Reed Pond, forming a dense growth 



covering several square yards, Sept. 1907 ; county fair grounds 



under an old wooden platform; head of Tom Never's Swamp ; 



Polpis, in a dense thicket, here, as well as in Tom Never's Swamp, 



* 



D. spinulosa, D. intermedia, D. cristata, D 



• * 



and D. sinmlata. 



Onoclea SENS 1BI LIS L. 



Common throughout 



EQUISETACEAE 

 Equisetum arvense L. 



Apparently not very common. On and below the sandy bluff 

 southwest of Wauwinet and on the sandy shore of Hummock Pond 

 a low spreading form pale in color with elongated slender branches 

 and much roughened epidermis. 



* Equisetum fluviatile L. 



Sparingly on the muddy border of a pond-hole or sink ringed 

 with a dense thicket of button-bush to the west of the monument 

 marking Tristram Coffin's homestead — Sept. 12, 1907. 



