604 LYCOPODIACEJE. (CLUB-MOSS FAMILY.) 



- - Spikes peduncled : viz. the leaves minute on the fertile branches. 

 w Leaves homogeneous and equal, many-ranked : stems terete. 



7. L.. clavatuiii, 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 2-3 (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 

 northward. July. (Eu.) 



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



8. LU < :i roliiiifi mini, 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 cylindri- 

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



9. It. complaiiatuiil, I*. Stems extensively creeping (often subter- 

 ranean), the erect or ascending branches several times forked above; bushy branch- 

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

 in 4 ranks, with decurrent-united bases, the lateral rows with somewhat spread- 

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

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

 thickets ; common : the typical form with spreading fan-like branches abundant 

 southward ; while northward, especially far northward, it passes gradually into 

 var. SABII03F6LIUM (L. sabinsefolium, Wittd., L. Chamsecyparissus, Braun), 

 with more erect and fascicled branches. (Eu.) 



2. SELAGINELL.A, Beauv., Spring. (Tab. 14.) 



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

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

 powdery spores ; and of 3 -4-valved tumid oophoridia, filled by 3 or 4 (rarely 1- 

 6) much larger globose-angular spores; 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 Sdago, an ancient name of a 

 Lycopodium, from which this genus is separated.) 



* Leaves all alike, equally imbricated ; those of the spike similar. 



1. S. selaginoides. Sterile stems prostrate or creeping, small and slen- 

 der; the fertile thicker, ascending, simple (l'-3' high); leaves lanceolate, acute, 

 spreading, sparsely spinulose-ciliate. (S. spinosa, Beauv. S. spinulosa, Braun.) 

 Wet places, New Hampshire (Pursh) and Michigan, Lake Superior and 

 northward; pretty rare. Leaves larger on the fertile stems, thin, yellcurish- 

 green. (Eu.) 



2. S. nipeStriS, Spring. Much branched in close tufa (l'-3 ; high) ; leaves 

 densely appressed-imbricated, linear-lanceolate, convex and with a grooved keel, 

 minutely ciliate, bristle-tipped ; those of the strongly 4-angular spike rather broad- 



