S72 CLIB-MOSS FAMILY. 



* » Fructification borne at the top or middle of an otherwise leaf 1/ frond. 



O. Claytonitoa. "Wet places, common : sterile fronds mu.ch like those 

 of the last, but more obtuse at the top ; fertile ones with 2-4 pairs of contracted 

 and-fertiic blackisk pinnsE just below the middle, — otherwisfc JiKe the sterile 



O. reg^lis, RoYAr- Fern. Also common in swamps and wet woods, 

 fruiting later than the others : fronds truly blpinnate ; pinnules oval or ol)long, 

 serrulate, obtuse, sometimes a little heart-shaped at base, or slightly auricled on 

 one side; fertile portion at the top of the frond, panicled; spore-cases light- 

 brown. 



29. BOTRYCHIUM, MOONWORT. (Name from the Greek word for 

 a bunch of grapes, from the appearance of the fructification.) Species very few, 

 none cultivated. 



B. tern^itum. Shaded,^assy pastures and hillsides : plant fleshy, 3' -10' 

 high ; common stalk with two branches, a long-stalked fertile one with twice or 

 'thrice pinnate fructification facing a triangular ternately compound sterile por- 

 tion on a longer or shorter stalk." — Has several forms : var. lunakioides has 

 roundish kidney-shaped sterile divisions; in var. obliqudm they are lanceolate 

 from an oblique base ; and in var. dissectum, pinnatifid into narrowly toothed 

 and ragged lobes. 



B. Virginieum. In rich woods : plant herbaceous, not fleshy, 6'- 18' high; 

 sterile portion sessile on ihe common stalk, thin, broadly triangular, ternate ; 

 the parts twice or thrice ]jinnate ; divisions thin, oblong-lanceolate, incised or 

 toothed; fertile portion long-stalked, twice or thrice pinnate. — Other smaller 

 species occur rarely N. 



30. OPHIOGLOSSTJM. (Greek equivalent of the common name ) 



O. VUlgitum, ADDER's-TONGnE Wet meadows or hillside pastures, 

 rare: 3'- 10' high; sterile portion somewhat fleshy, ovate or elliptical, entire, 

 l'-2' long, sess3e near the middle of the stalk which supports the short two- 

 sided spike. — Some rare tropical species have large and palmate, or pendulous 

 and ribbon-like fronds. 



134. LYCOPODIACE^, CLUB-MOSS FAMILY. 



Flowerless plants, often moss-like or fern-like, with leafy, often 

 elongated and branching stems, the spores contained In rather large 

 solitary spore-cases borne in the axils of the simple mostly awl- 

 shaped leave>:. 



§ 1. Growintf on land ; stems mo)'e or less ehmtjaitd and branching : leaves mostly 

 less than V long, often mitiute: spore-cises in the axils of the upper [(ften 

 transformed and imbricated) scale-like leaves. 



1. LYCOPODIUil. Mostly evergreen plants ; the leaves awl-shaped, in 4 or 



more rows j the 2-valved kidney-shaped spore-cases all of one kind, contain- 

 ing only minute numberless spores. 



2. SELAGINELLA. But cue species evergreen N. ; leaves mostly flattened, rare- 



ly awl-shaped, mostly in 4 rows, two rows being of smaller lervves; .spore-ea^os 

 - of 2 kinds; one 2-valved and filled with minute spores, the other 3-4-valved 

 and containing very few large spores. 



§ 2. Growing in water or mud: stems rery short and corm-like: leares rtish-Uie, 

 elongated, wiOi large spore-cases adhering to ihe upper sv if ace of their dilated 

 bases, and as if imbedded in them. 



3. ISOETES. Outer spore-cases with large reticulated spores ; inner ones with 



minute powdery spores. 



1. LYCOPODIUM, CLUB-MOSS, (Name from the Greek, meaning 

 wolf's-font, probably from the short hairy branches of L. clavatmn ) Specicj 

 about 100, in all parts of the world : the following all wild species. 



