372 CLUB-MOSS FAMILY. 



* * Fructification borne at the top or middle of an otherwise leafy frond. 



O. Claytoniana. Wet places, common: sterile fronds much like those 

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

 and fertile blackisK pinnae just below the middle, otherwist like the sterile. 



O. regalis, ROYAL FERN. Also common in swamps and wet woods, 

 fruiting later than the others : fronds truly bipinnate; pinnules oval or ablong, 

 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 graphs, from the appearance of the fructification. ) Species very few, 

 none cultivated. 



B. ternatum. Shaded grassy 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 tei'natcly compound sterile por- 

 tion on a longer or shorter stalk. Has several forms: TAP. LUNARIOIDKS has 

 roundish kidney-shaped sterile divisions; in var. onLlQui'M they are lanceolate 

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

 and ragired lobes. 



B. Virginicum. In rich woods : plant herbaceous, not fleshy, 6' - 1 8' high ; 

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

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

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

 species occur rarely N. 



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



O. vulgatum, APDI-U'S-TONGUE Wet meadows or hillside pastures, 

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

 l'-2' long, sessile near the middle of the stalk whiph supports the short two- 

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

 and ribbon-like fronds. 



134. LYCOPODIACE^E, CLUB-MOSS FAMILY. 



Flowerle.-s 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 leaver. 



1. Growing on land : stems more or less elongated and branching: leaves mostly 

 less than 1' Inn;/, often minute: spore-cases in Ike axils of th^ upper (often 

 transformed and imbricated) scale-like leaves. 



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



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

 ing only minute numberless spores. 



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



ly awl-shaped, mostly in 4 rows, two rows being of smaller leaves; spore-cases 

 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 : leaves rush-like, 

 elongated, with large spore-cases adhering to the upper surf ace of their dilated 

 bnses, and as if imbedded in them. 



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



minute powdery spores. 



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

 wolf's-foot, probably from the short hairy branches of L. davatnm. } Specie* 

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



