SELAGINELLA FA:\IILY 



47 



2. Selaginella bigelovii I'nderw. 

 Bushy, or Bigelow's, Selaginella. Fig. 100. 



Selaginella bigelovii Underw. Bull. Torrey Club 25: 130. 1898. 



Plants cespitose ; stems ascending or erect. 6-20 cm. long, 

 rooting only at the defoliate base, repeatedly branched ; 

 branches variable in length, ascending or erect, often crowded 

 or intricate, the ultimate divisions mostly short, terete. 

 Leaves very oblique, rigidly appressed-imbricate, uniform, 

 1.6-2.4 mm. long (seta included), the blade subulate-attenu- 

 ate. 1.3-1.9 mm. long, 0.3-0.5 mm. broad, herbaceous, sub- 

 glaucous, sulcate dorsally nearly to the convex acutish tip, 

 narrowly whitish-marginate ; seta 0.25-0.5 mm. long, white, 

 rigid, strongly scrabrous ; cilia 8-17 on each side, 0.03-0.06 mm. 

 long, oblique, pungent. Spikes 5-10 mm. long, terminating 

 many of the apical branches, slender ; sporophylls mostly 

 deltoid-ovate., long-acuminate, 1.7-2.35 mm. long' (seta in- 

 cluded), 0.6-1 mm. broad, rigid, carinate ; seta 0.3-0.6 mm. 

 long, whitish, rigid, scabrous ; cilia 30 or more on each side, 

 very close, oblique, mostly 0.02-0.06 mm. long; megaspores 

 depressed-globose, yellow, up to 0.42 mm. thick, lightly reticu- 

 late or rugose-reticulate on all sides ; microspores bright 

 orange, about 0.032 mm. thick. 



Dry, sunny, rocky slopes and ridges, Upper Sonoran Zone; desert region of 

 ward to Santa Clara County, and upon the coast islands. Type locality: southe 



southern 

 rn Califo 



California, north- 

 rnia. 



3. Selaginella eremophila iSIaxon. 

 Desert Selaginella. Fig. 101. 



12^: 3. pi. 2. 

 202. 1906, 



Selaginella eremophila Maxon, Smiths. Misc. Coll. 



1920. 

 Selaginella parishii Underw. Bull. Torrey Club 33: 



in part. 



Plant wholly prostrate, strongly dorso-ventral, the 

 main stems 5-12 cm. long, rooting sparsely throughout; 

 lower branches subequal, spreading, 2-3-pinnate, the 

 ultimate divisions very short, involute. Leaves crowded, 

 those of the lower side imbricate, thin, lanceolate, 

 acutish, 2 mm. long, 0.5 mm. broad, not setigerous, with 

 about 25 spreading cilia on each side ; leaves of upper 

 side rigid, nearly vertical, deltoid-subulate, 1-L4 mm. 

 long, 0.4-0.47 mm. broad, acutish, not setigerous, with 

 6-12 weak spreading cilia on each side, these about 0.1 

 mm. long. Spikes numerous, arcuately ascending, 6-10 

 mm. long, 1 mm. thick; sporophylls "deltoid, acute or 

 acutish, not setigerous, 1.2-1.4 nun. long. 0.9-1 mm. 

 broad, with 12-18 spreading or weakly ascending cilia 

 on each side, these 0.09-0.125 min. long; megaspores 

 light yellow, 0.36-0.4 mm. thick, deeply reticulate ; 

 microspores yellow, about 0.039 mm. thick. 

 Crevices of arid rocky slopes, Lower Sonoran Zone; western border of the Colorado Desert, southern 

 California. Type locality: Palm Canon, Riverside County, California. 



4. Selaginella cincerascens A. A. Eaton. Pygmy, or Gray, Selaginella. Fig. 102. 



Selaginella cinerascens A. A. Eaton, Fern Bull. 7: 33. 1899. 



Plants very small, the main stems 5-12 cm. long, 

 0.5 mm. thick (leaves excluded), prostrate, rooting 

 throughout, pinnately branched'; branches close, 

 1-2.5 cm. long, prostrate, 2-pinnate, the numerous 

 divisions close, 2-4 mm. long, clavate, oblique. 

 Leaves crowded, appressed-iml:)ricate., ashy-gray, her- 

 Ijaceous, linear to broadly subulate, acute or acutish, 

 not setigerous, those of the stems nearly flat, up to 

 2 mm. long, those of the branches incurved, 1.3-1.7 

 nun. long. 0.2-0.35 mm. broad, the deep dorsal groove 

 not reaching the convex tip; cilia 5-15 on each side, 

 deciduous, oblique, mostly 0.04-0.09 mm. long, the 

 upper ones reduced to serratures. Spikes 1.5^ mm. 

 long, thick, deciduous with age ; sporophylls broadly 

 cordate, abruptly short-acuminate. 1-1.25 mm. long, 

 about 1 mm. broad, deeply cucullate, not setigerous ; 

 cilia 16-20 on each side, mostly ascending, rigid, 

 crowded, 0.02-0.04 mm. long, or shorter; mega- 

 spores yellow, about 0.44 mm. thick, coarsely reticu- 

 late-alveolate on all sides; microspores about 0.047 

 mm. thick, orange, spinulose. 



Closely carpeting dryish, open or brushy hillsides, in clay 

 soil, Upper Austral Zone; coastal belt near San Diego, California, the type locality. 



