SELAGINELLACEM. 139 



6. S. mutica D. C. Eaton. Stems creeping, rather rigid, 

 3' 6' long, divided and pinnately branched ; leaves glau- 

 cescent, six-ranked, closely imbricated, half a line long, oblong- 

 ovate, convex, and slightly grooved on the back, obtuse, 

 and without a terminal seta, the margins ciliated with 10 15 

 spreading cilia on each side, which are 0.12 mm. long or longer; 

 spikes scarcely thicker than the branches, quadrangular, the 

 bracts broader than the leaves and pointed or even obscurely 

 mucronate. Colorado, New Mexico, and Arizona. 



T t Stems spreading, 8' 12' long, rooting only at the base. 



7. S. tortipila A. Br. Stems 8' 12' long, more or less 

 flexuous, with the elongate primary branches compound, root- 

 ing only near the base ; leaves loosely imbricate, about six- 

 ranked, narrowly lanceolate, scarcely channeled dorsally, ending 

 in a contorted or irregularly coiled elongate hair-point ; margins 

 with 6 12 very short cilia on either side; spikes very short 

 (2" 2^"), borne at the ends of ordinary branches, subquad- 

 rangular, but with loosely spreading broadly ovate-lanceolate 

 bracts, which are dorsally channeled and bear marginal cilia 

 and terminal hairs similar to those of the stem-leaves. Broad 

 River, North Carolina (Kugel), Caesar's Head, South Carolina 

 (/. D. Smith). 



* * Stems pendent, flaccid. 



8. S. struthloloides (Presl.) Underw. i 6 long, pin- 

 nately much branched; leaves loosely imbricate, scarcely i" 

 long, linear-lanceolate, convex and grooved on the back, acute, 

 sparsely spinulose-denticulate, not bristle-tipped ; spikes quad- 

 rangular, very slender ; macrosporangia scarce. (S. Oregana 

 D. C. Eaton, Lycopodium Presl.) Port Orford, Oregon (Kautz) ; 

 Tilamook Valley, Oregon (Howell) ; probably in Northern Cali- 

 fornia. 



* * Stems erect or ascending. 

 t Spikes ' -i^' long ; plant rooting in sand. 



9. S. arenicola Underw. Deeply rooting in sand with 

 fine copious roots, often 6' 8' long; stems slender, branching, 

 erect or ascending, densely caespitose, 2' 3' high, emitting 

 copious brown wiry roots a little distance above the base ; 

 leaves closely appressed, narrowly lanceolate, 0.25 mm. wide, 



