Phegoptcris phegopteris, but the latter seemed to flourish even 

 better on the side of the mountains in grassy places. 



The third area was the richest m ferns. Cyst op ten's frag /lis 

 was common in the crevices of the rock peaks, as was Woodsia 

 ilvensis in similar situations. Both were found near the summits. 

 Woodsia glabella was seen only on Anvil Mountain. It grew on 

 the terraces among grass and heather, occurring rather sparingly 

 from the base to near the summit. Cryptogramma acrostichoides 

 grew in talus at the base of cliffs. It was nowhere very abundant, 

 nor was it quite as large as the form in the States. At the base 

 of the mountains in rock-slides among immense slabs of mica 

 schist Dropteris fragrans found a hiding place. I extracted the 

 first specimen with great difficulty, having to reach down into a 

 deep, almost perpendicular crevice. I had to get a firm hold with 

 my toes back of a rock in order to pull myself out of the place. It 

 was not very abundant, though dwarfed forms were seen near the 

 summit at an altitude of 700 or 800 feet. Here the new species, 

 Dryopteris aquilionaris, was discovered. It grew in the crevices 

 of solid rock along with Woodsia ilvensis, Dryopteris fragrans, 

 Cystopleris fragilis and Phegopteris Dryopteris. It is related 

 to D. fragrans, but easily distinguished from it, being smaller and 

 more graceful. 



Tacoma, Wash. 



THE GENUS EQISETUM WITH REFERENCE TO THE 

 NORTH AMERICAN SPECIES. 



By Alvah A. Eaton. 



TEMS dimorphous; fertile erect, 3-18 inches high, 2 -3 in 



diameter, at first naked, but soon producing, from the two or 



three upper nodes, verticils of recurved decompound branches 

 which last through the season; internodes 5-15, brownish, mostly 

 smooth, grooves broad and shallow, developing a double row of 

 stomata on each side as the season advances ; sheaths large, 4 -10 

 long, ventricose, with spreading top ; leaves rounded on back or 

 slightly grooved when dry, gradually passing into thin russet teeth 

 which equal them in length and are connate into 3-4 groups; cen- 

 tral cavity a little more than half the diameter of stem; spike 

 conical 1-1*2 inches long, usually raised on a fleshy peduncle. 



SEVENTH PAPER. 



E. SlLVATICUM L. 



