604 LYCOrODIACEJS. (club-moss family.) 



+■ +- Spikec. peduncled : viz. the leaves minute on the fertile branches. 

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



7. JL. clavntuni, 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. L<. CaroIiroifgiEHin, 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 ividely 

 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. L<. COlliplanatuen, L Stems extensively creeping (often subter- 

 ranean), the crec', or ascending branches several tunes 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. sabin^ef6lium (L. sabina;folium, Willd., L. Chamaecyparissus, Braun), 

 with more erect and fascicled branches. (Eu.) 



2. SELAGINELLA, 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 Selago, an ancient name of a 

 Lycopodium, from which this genns is separated.) 



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



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

 der; the fertile thicker, ascending, simple (I' -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, yellowisfc- 

 green. (Eu.) 



2. S. riapfistris, Spring. Much branched inclose tufa (1'- 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- 



