372 CLUB-MOSS FAMILY. 



• * Fructijkation borne at the top or middle of an otherwise leafy fronds 

 O. Claytoni&na. 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 pinnse just below the middle, — otherwise like the sterile 



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

 fruiting later than the others : fronds truly bipinnate; 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, panicled; spore-cases light- 

 brown. 



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

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

 none cultivated. 



B. ternd: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. LuiTAKioiDES has 

 roundish kidney-shaped sterile divisions ; in var. oblIqdum 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 ' - 1 8' high ; 

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

 the parts twice or thrice pinnate ; divisions thin, oblonsr-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. vulg&tum, Addbr's-tongue Wet meadows or hillside pastures, 

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

 1 ' - 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. (Lessons, p. 158, fig. 508.) 



134. LYCOPODIACE.ffi;, 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- 

 ^haped leaves. (Lessons, p. 160, fig. 511-515.) 



§ 1. Growinff on land : stems Tnore or less elongated and branching: leaves mostly 

 less than 1' long, often minute: spore-cases in the axik of the upper [often 

 transformed avid imbricated) scale-like leaves. 



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



more rows ; the 2-yalv"ed 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 very short and corm-Uhe: leaves rush-tike, 

 elongated, with large spare-cases adhering to ihe upper surf ace of their dilated 

 bases, and as if inwedded in them. 



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



minute powdery spores. 



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

 wolf'sfoot, probably from the short hairy branches of A. clavatmn ) Species 

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



