I40 OUR NATIVE FERNS AND THEIR ALLIES. 



deeply channeled dorsally, terminated by a spinulose white 

 awn 0.35 — 0.50 mm. long; margins with numerous short cilia; 

 spikes 2 — 3 cm. long, slender, sharply quadrangular, the bracts 

 broadly lanceolate, spreading at maturity with copious mar- 

 ginal cilia (i 5 — 20 on either side) ; microspores very abundant 

 throughout the length of the spike, globose-tetrahedral, 0.036 — 

 0.039 "i"i- '" diameter, bright yellow or pale orange. (5. are- 

 naria Underw., not Baker.) In sand, Florida, Texas ? 

 1 1 Spikes J' or less long ; plants growing on rocks. 



10. S. rupincola Underw. Stems suberect, somewhat 

 flexuous, 3' — 5' high, rooting only from near the base, pinnately 

 branching, the secondary branches mostly very short ; leaves 

 channeled dorsally, closely imbricate, spreading only near the 

 growing tips of the stem, glaucous or cinereous green, tapering 

 toward the apex and ending in a long white denticulate spine 

 I mm. or more long; margins strikingly long-ciliate, 15 — 20 on 

 either side ; spikes ^ or less long, borne laterally on the 

 branches, scarcely quadrangular, the bracts closely resembling 

 the ordinary stem-leaves, so as to render the spikes scarcely 

 distinguishable except for the axillary sporangia ; macrospores 

 dark-yellow, 0.24 — 0.27 mm. in diameter, strongly and deeply 

 pitted reticulate. New Mexico and Arizona. 



11. S. Bigelovii Underw. Stems slender, 4' — 8' long, 

 mostly ascending, flexuous, usually wjth short ascending pri- 

 mary branches ; secondary branches infrequent and mostly very 

 short ; stems rooting only near the base ; leaves about six- 

 ranked, appressed-imbricate, usually with a distinct dorsal 

 channel, narrowly lanceolate, tapering gradually into a densely 

 spinulose white awn often 0.7 mm. long; margins with 12 — 15 

 cilia on either side, which are directed forward and usually less 

 than 0.050 mm. long ; spikes obtusely quadrangular, mostly on 

 short lateral branches 5 mm. or less long, the bracts short, 

 broadly ovate but otherwise like the leaves. Southern Cali- 

 fornia. 



I 2. Stachygynandrum Baker. Stem leaves of two kinds, 

 spreading in two planes, those of the tipper plane smaller and 

 more ascending ; bracts uniform. 

 * Main stems decumbent ; root fibres extending to upper nodes. 

 t Stems persistent ; leaves rigid, firm in texture. 



