The Ferns of Washington 43 



separate and peripheral or united upward forming a 

 lunate bundle. Sori oblong or linear, oblique to mid- 

 vein, separate; indusium straight, opening toward 



mid-vein. (Greek a~ taking away, splen «■ spleen; some 

 were formerly supposed of value in spleen diseases.) 



A. Petiole purple to brown, shining, round; leaflets 12-36 pairs, oval; 



margin crenate. 1. A. trichomanes. 



A A. Petiole green, dull, flat; leaflets 6-20 pairs, ovate or rhomboidal; 



margin deeply crenate. 2. A. viride. 



1. Asplenum TUKHOMAXKS L. (Plate 16, f. 10, 11.) 



Leaves 3-12 inches long, densely tufted; petioles 

 purple to brown, shining, short; leaflets 12-36 pairs, 

 nearly opposite, oval, the two sides often unequal, 

 wedge-shaped or truncate at l>ase, margin crenate. 

 Alaska to Nova Scotia, south to Arizona, Texas and 

 Alabama. 



2. Asplenium VIRIDE Huds. (Pin to 16, f. 8, 9.) 



Leaves 2-4 inches long, thinly tufted; petioles flat 

 and given except at base, often as long as blade; leaf- 

 lets 6-20 pain, ovale to rhomboidal in outline, upper 

 edge narrowed suddenly at base, lower narrowed grad- 

 ually, margin deeply crenate. — Alaska to Oregon, Colo- 

 rado and Vermont; Europe; Asia. 



8. LOMARIA. 



Tufted; rhizomes erect. Sterile leaves shorter than 

 the fertile and distinctly different; both kinds 1-pinnate 

 (ours) or 2-pinnate; petiole not twisted. Sori parallel 

 to the mid-vein of the Leaflet, often covering almost the 

 whole under side of the blade. (Greek loma- a border, 

 probably referring to the indusium.) We have only 

 the following speeies. 



