SELAGINELLA FA^IILY 



49 



8. Selaginella watsoni Undcrw. Alpine Selaginella. Fig. 106. 



Selaginellc watsoni Underw. Bull. Torrey Club 25: 127. 1898. 



Plants cespitose, usually densely so ; stems prostrate, 

 short-creeping, 2-6 (10) cm. long, rooting throughout; 

 branches numerous, 1-2.5 cm. long, mostly 2-pinnate, 

 rigidly ascending, the divisions short, thick, closely cespi- 

 tose. equally leafy on all sides. Leaves of the branches 

 uniform, densely appressed-inibricate. thick, linear-oblong, 

 rounded-obtuse, abruptly short-setigerous, 1.8-2.4 mm. 

 long (seta included). 0.5-0.63 mm. broad, strongly cymbi- 

 form, with a broad dorsal groove ; seta 0.2-0.25 mm. long_, 

 stout, lutescent. smooth ; cilia 2-7 or wanting, 0.03-0.065 

 mm. long, slightly oblique, deciduous. Spikes 1-2.5 cm. 

 long,, sharply quadrangular ; sporophylls appressed-imbri- 

 cate. ovate, acuminate, 1.8-2.5 mm. long (seta included). 

 0.9-1.1 mm. broad; seta 0.25-0.35 mm. long, lutescent, stout, 

 rigid, pointed, smooth; cilia 10-15, confined to the basal 

 half, stout, 0.015-0.05 mm. long, often dentiform : mega- 

 spores 0.42-0.47 mm. thick, yellow, rugose-reticulate ; 

 microspores about 0.039 mm. thick, orange. 



Rocky slopes and cliffs, Hudsonian and Arctic-Alpine Zones; high 

 mountains of California (Nevada County to Riverside County), east- 

 ward to Utah, ascending to 3,450 meters. Type locality: Cotton- 

 wood Canyon, Utah. 



9. Selaginella leucobryoides ]\Iaxon. Mojave Selaginella. Fig. 107. 



Selaginella leucobryoides Maxon, Smiths. Misc. Coll. 72=: 8. pt. 5. 1920. 

 Plants cushion-like ; stems short-creeping, 1-2 cm. long, 

 prostrate, once pinnate ; branches thick, erect, strongly 

 cespitose, the sterile ones 2-7 mm. high, densely leafy. 

 Leaves crowded, appressed-imbricate, mostly incurved, 

 glaucous, tmiform. linear-subulate, the basal ones up to 

 3.25 mm. long (seta included), the upper ones shorter, all 

 the leaves thick, rigidly herbaceous, strongly convex dorsally 

 toward the acutish apex, short-setigerous ; seta stout, milk- 

 white, 0.12-0.28 mm. long, strongly scabrous, often reflexed ; 

 cilia 8-16 on each side, the lower ones spreading, 0.6-0.13 

 mm. long, the upper ones distant, shorter, ascending. Spikes 

 numerous, close, 5-10 mm. long, about 1.5 miu. thick, erect; 

 sporophvlls rigidly appressed-imbricate, deltoid-ovate, long- 

 acuminate, about 2 mm. long, 0.8-1 mm. broad ; seta 0.15 

 'r^'"-5i^ - ff"Y^5SS5if?-v ^ «:PSi«K"' .mm. long or less, white, rigid, pointed, subentire; cilia and 

 ^^^^^'vM^^^^i^^^-; ' teeth 20^-25 on each side, oblique, very short, pungent ; 



megaspores yellow, about 0.47 mm, thick, reticulate; micro- 

 spores orange, about 0.039 mm. thick. 



Crevices of rocky slopes. Upper and Lower Sonoran Zones; Pana- 

 mint and Providence Mountains, southern California. Type locality: 

 Bonanza Mine, Providence Mountains, California. 



^^\ 



10. Selaginella wallacei Hieron. Wallace's Selaginella. 



Selaginella zialUicei Hieron. Hedwigia 39: 297. 1900. 



? Selaginella montancnsis Hieron. Hedwigia 39: 293. 1900. 



Plants loosely cespitose ; main stems prostrate, 5-15 

 (20) cm. long, rooting sparsely throughout; branches 

 numerous, ascending, 1-4 cm. long, freely branched, 

 the divisions short, divaricate, rigid, funiform, often 

 intricate. Leaves chartaceous, rigidly appressed-iiubri- 

 cate on all sides, subglaucous, mostly oblong-linear, 

 narrowed to an obtusish apex ; leaves of larger branches 

 2.5-3.35 mm. long (seta included), 0.45-0.63 mm. broad, 

 with seta 0.3-0.6 mm. long ; leaves of smaller branches 

 13-2.5 mm. long (seta included). 0.3-0.45 min. broad, 

 the seta 0.15-0.3 mm. long, whitish-hyaline, scabrous; 

 cilia 8-14 on each side, oblique, 0.06-0.1 mm. long. 

 Spikes numerous, 1-3 cm. long, slender, curved ; sporo- 

 phylls ovate-deltoid (often narrowly so). 1.8-2.8 mm. 

 long (seta included), 0.75-1.1 mm. broad, abruptly setig- 

 erous : seta 0.15-0.45 mm. long, stout, whitish-hyaline, 

 nearly smooth ; cilia 10-18 on each side, oblique, in- 

 curved, 0.03-0.08 mm. long, or all short and dentiform ; 

 megaspores yellow, up to 0.45 mm. thick, tuberculate- 

 reticulate. annulate ; microspores about 0.04 trim, thick. 



Rock-slopes and bluffs, Humid Transition to Hudsonian Zone; 

 British Columbia to Montana and Oregon, south along the coast 

 to Marin County, California. Type locality: Oregon. Variable. 



Fisr. 108. 



