98 American Fern Journal 



sessile on the common petiole; basal veins 9-11, con- 

 nected by cross veins above. Spore-leaf with petiole 

 about as long as the common petiole. Sporangia large, 

 coriaceous. — Washington to Arizona, Texas and Maine; 

 Europe; Asia. 



BOTRYCHIUM. Grape-fern. 



Plants fleshy; rootstocks short, erect, foliage- and 

 spore-leaf compound, pinnately or ternately divided; 

 spore-leaf 1-3-pinnate; veins free. Sporangia sessile or 

 distinct, in rows on either side of the branches, forming 

 large panicles in some. Spores of various shades of 

 yellow. (Diminutive of Greek botrys = a cluster of 

 grapes; from the resemblance of the spore-bearing 

 leaf.) 



A. Leaf usually 1-pinnate (sometimes 2-pinnate in B. lanceolatum.) 

 B. Leaf-segments fan- or wedge-shaped. 



C. Leaf-segments mostly in contact or overlapping, margin crenate 

 to entire; stem very fleshy. 1. B. lunaria. 



CC. Leaf-<cgments too far apart to touch each other, margin notched 

 or Incised; stern slender. 2. B. Onondagense. 



BB. Leaf-segments oblong or lanceolate. 



D. Outer leaf-segments lanceolate, acute. 3. B. lanceolatum. 

 DD. Leaf-segments oblong, obtuse. 4. B. neglectum. 



AA. Leaf ternately divided, divisions 1-3-pinnate. 



E. Petiole slender; common petiole \i or more of entire length; foliage- 

 leaf sessile. 5. B. Virginianum. 



EE. Petiole robust; common petiole short; foliage-leaf not sessile. 



6. B. silaifolium. 



1. BOTRYCHIUM LUNARIA (L.) S\V. (PL 6, /. 2.) 



Moon wort. 



Plant very fleshy, 2-12 inches high. Foliage-leaf 

 usually sessile, pinnate with 2-8 pairs of truncate or 

 fan-shaped segments with crenate to entire margins. 

 Spore-leaf 2-3-pinnate, often dense, 1-2 inehes long, 

 often about the height of the foliage leaf, its petiole 

 shorter than the common petiole.— Washington to Col- 

 orado and Labrador and northward; Europe; Asia. 



