372 CLUB-MOSS FAMILT. 



* * Frudi/lcation borne at the top or middle of an otherwise hafy frond. 



O. Claytoni^na. Wet places, common : sterile fronds much like thosa 

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

 and fertile blackis!; pinnfe just below the middle, — otherwisfc like the sterile. 



O. regUis, Royal Feen. Also common in swamps and wet woods, 

 fruiting later than the others : fronds truly bipinUate; pinnules oval or oblong, 

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

 One side; fertile portion at the top of the frond, panlcled; 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^tum. 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 temately compound sterile por- 

 tion on a longer or shorter stalk. — Has several forms : var. lun AmOioES has 

 roundish kidney-shaped sterile divisions; in var. oblIqcum they arc lanceolate 

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

 and ragged lobes. 



B. Virginicum. Inrich woods: plantherbaceous,notfleshy, 6'-18'high; 

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

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

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

 species occur rarely N. 



30. OPHIO GLOSSXJM. ( Greek equivalent of the common- name. ) 



O. vulgitum, Addek's-tongue. Wet meadows or hillside pastures, 

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

 I' -2' long, sessile 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-SI, 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 leaves. 



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

 less than 1' long, often minute: spore-crises in the axils of Hie upper [often 

 transformed arid imbricated) scale-tike leaves. 



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



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

 ing only minute numberlpss spores. 



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



ly awl-shaped, mostly in 4 rows, two vows 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 very short and corm-like : leaves rush-like, 

 elongated, with large spore-cases odheHng to tlie upper surface of tlieir dilated 

 bases, and as if imbedded in them. 



3. ISOKTES. Outer spore-cases with 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. clavatinn.) Special 

 about 100, m all parts of the woi-ld : the following all wild species. 



