674 LYCOPODIACE^E. (CLUB-MOSS FAMILY.) 



tary, oblong-cylindrical, thick. Var. PTJNGENS, Spring, is a reduced sub-alpine 

 or mountain form, with shorter and more rigid-pointed erectish leaves. (Var. 

 montanum, Tuclcerm.) Woods: common northward: the var. on the White 

 Mountains, with intermediate forms around the base. July. (Eu.) 



6. L. dendroideum, Michx. (GROUND-PINE.) Stems upright (6' -9' 

 high) from a subterranean creeping rootstock, simple below, and clothed with 

 homogeneous lanceolate-linear acute entire leaves appressed-erect in 4 - 6 rows, 

 bushy-branched at the summit ; the crowded branches spreading, fan-like, with the 

 lower row of leaves shorter and the lateral spreading : in var. OBSCURUM ap- 

 pearing flat, from the leaves of the upper side being also shorter and appressed. 

 (L. obscurum, L. ) Moist woods. Aug. Remarkable for its tree-like growth. 

 Spike cylindrical, 4- 10 on each plant. 



- * Spikes pe.duncled : i. e. the leaves minute on the fertile branches, 

 -< Leaves homogeneous and equal, many-ranked ; stems terete. 



7. L. clavatum, L. (COMMON CLUB-MOSS.) Stems creeping exten- 

 sively, with similar ascending short and very leafy branches ; the fertile termi- 

 nated by a slender peduncle (4' 6' long), bearing about 23 (rarely 1 or 4) 

 linear-cylindrical spikes; leaves linear-awl-shaped, incurved-spreading (light 

 green), tipped, as also the bracts, with a fine bristle. Dry woods : common, 

 especially northward. July. (Eu.) 



+* - Leaves of two forms, few-ranked: stems or branches flattened. 



8. L. Carolinianum, L. Sterile stems and their few short branches 

 entirely creeping (leafless and rooting on the under side), thickly clothed with 

 broadly lanceolate acute and somewhat oblique 1 -nerved lateral leaves widely 

 spreading in 2 ranks, and a shorter intermediate row appressed on the upper side ; 

 also sending up a slender simple peduncle (2' -4' high, clothed merely with small 

 bract-like and appressed awl-shaped leaves )', bearing a single cylindrical spike. 

 Wet pine-barrens, New Jersey to Virginia, and southward. July. 



9. L. complanatlim, L. Stems extensively creeping (often subterra- 

 nean), the erect or ascending branches several times forked above; bushy brancUets 

 crowded, flattened, all clothed with minute imbricated-appressed awl-shaped leaves in 4 

 ranks, with decurrent-united bases, the lateral rows with somewhat spreading 

 tooth-like tips, those of the upper and under rows smaller, narrower, wholly 

 appressed ; peduncle slender, bearing 2-4 cylindrical spikes. Woods and thick- 

 ets : common : the typical form with spreading fan-like branches, abundant south- 

 ward ; while northward, especially far northward, it passes gradually into var. 

 SABiNJEF6Liu'M (L. sabinaefolium, Willd. L. Chamaecyparissus, Braun), with 

 more erect and fascicled branches. (Eu.) 



2. SELAGINELLA, Beauv., Spring. (PI. 20.) 



Fructification of two kinds, namely, of spore-cases like those of Lycopodium, 

 but minute and oblong or globular, containing reddish or orange-colored pow- 

 dery spores; and of 3-4-valved tumid larger ones, filled by 3 or 4 (rarely 1 r 

 6) much larger globose-angular spores (oophoridia) ; the latter either intermixed 

 with the former in the same axils, or solitary (and larger) in the lower axils of 

 the leafy 4-ranked sessile spike. (Name a diminutive of Selago, an ancient name 

 of a Lycopodium, from which this genus is separated.) 



