694 OPHIOGLOSSACE.E. (ADDER's-TONGUE FAMILY.) 



versely into two valves. Sterile segment of the frond ternately or pinnately 

 divided or compound ; veins all free. Spores copious, sulphur-color. (Name 

 a diminutive of pdtrpvs, a cluster of yrapes, from the appearance of the 

 fructification.) 



1. BOT11YCHIUM proper. Base of the static containing the bud completely 

 closed ; sterile segment more or lessjies/iy ; the cells of the epidermis straight. 



* Sterile portion of the frond sessile or nearly so at or above the middle of the 



plant. Plants small. 



1. B. Lunarta, Swartz. Sterile segment nearly sessile, borne near the 

 middle of the plant, oblong, simp/// pinnate with 5-15 lunate or fan-shaped very 

 obtuse crenate, incised or nearly entire, fleshy divisions, more or less excised at 

 the base on the lower or on both sides, the veins radiating from the base and 

 repeatedly forking ; fertile segment panicled, 2 - 3-pinnate. N. Eng. to Lake 

 Superior, and northward ; rare. Very fleshy, 4 - 10' high. (Eu.) 



2. B. simplex, Hitchcock. Fronds small (2-4', rarely 5-6' high), the 

 sterile segment short-petioledfroin near the middle of the plant, thickish and fleshy, 

 simple and roundish, or pinnately 3 - 7-lobed ; the lobes roundish-obovate, nearly 

 entire, decurreut on the broad and flat indeterminate rhachis ; the veins all 

 forking from the base ; fertile segment simple or 1 - 2-piimate. Maine to 

 N. Y., Minn., and northward ; rare. (Eu.) 



3. B. lanceolatum, Augstroem. Fronds small (3-1 0' high) ; the sterile 

 segment closely sessile at the top of the long and slender common stalk, scarcely 

 fleshy, triangular, ternately twice pinnatijid ; the acute lobes lanceolate, incised 

 or toothed; veinlets forking from a continuous midvein ; fertile part 2 3-pin- 

 nate. N. Eng. and N. J. to Ohio and Lake Superior. July- Aug. (Eu.) 



4. B. matricarisefolium, Braun. Fronds small (3-10' high); the 

 sterile segment nearly sessile at the top of the long and slender common stalk, 

 moderately fleshy, ovate or triangular, varying from pinnate to bipinnatifi 1 ; 

 the lobes oblong-ovate and obtuse ; midvein dissipated into forking veinlets; fer- 

 tile part 2 -3.pinuate. Same range as the last. June, July. (Eu.) 



* * Sterile portion of the frond long-stalked; the common stalk short in propor- 



tion to the size of the plant. Plants usually larger. 



5. B. ternatum, Swartz. (PI. 20.) Plant very fleshy (4-16' high), 

 sparsely hairy ; sterile segment lonq-petioled from near the base of the plant, 

 broadly triangular, ternate and variously decompound with stalked divisions ; 

 ultimate segments varying from roundish-reniform and sub-entire to ovate- 

 lanceolate and doubly incised; fertile segment erect, 2-4-pinnate. The fol- 

 lowing varieties pass into each other : Var. AUSTRALE ; frond ample ; ultimate 

 segments rhomboid-ovate with a denticulate margin. Var. INTERMEDIUM; 

 frond of moderate size ; ultimate segments as in var. australe. (B. luuarioides, 

 of last ed.) Var. RUT^F6LiUM ; frond small; ultimate segments few, ovate 

 and semicordate. Var. LUNARIOIDES ; frond small ; ultimate segments round- 

 ish-reuiform. Var. OBLIQUUM ; frond moderate ; ultimate segments obliquely 

 lanceolate, denticulate or toothed. Var. DISSECTUM ; segments dissected into 

 innumerable narrow lobes or teeth. Pastures and hillsides, sometimes in 

 dry woods, rather common, especially vars. intermedium and obliquum. Var. 

 ruta;foliu:ii occurs in Europe. 



