2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 'J2 



show very well some of the more diverse forms assumed by members 

 of this group. All the illustrations are at natural size and represent 

 the type specimens in each instance, excepting only that of vS". arizonica 

 which is of Thornher 315. 



SELAGINELLA NEOMEXICANA Maxon, sp. nov. 



(PI. I) 



Plants strongly assurgent, 10 to 20 cm. long, the main stem rooting 

 sparingly at the extreme base, freely ramose, all the branches erect 

 or ascending, several times pinnate, subequal ; stems (leaves ex- 

 cluded) mostly 0.2 to 0.5 mm. in diameter, the older ones readily 

 defoliate. Leaves uniform, rigidly ascending on all sides, subdistant 

 in attachment, imbricate but not wholly concealing the axis, 2 to 

 2.75 mm. long (seta included), the blades subulate-attenuate, 1.7 to 

 2.5 mm. long, 0.37 to 0.5 mm. broad at the base, setigerous (the seta 

 0.3 to 0.47 mm. long, whitish-hyaline from a greenish-lutescent base, 

 straight, sparingly serrulate), thin-herbaceous, spongiose at the base, 

 subglaucous, flat above, dorsally convex toward the narrowly obtuse 

 apex, sparingly pilose at the base of the deep narrow median groove, 

 ciliate, the cilia 12 to 20 on each side, slender, rigid, nearly straight, 

 mostly 0.06 to 0.125 mm. long, spreading or slightly ascending, the 

 apical ones reduced and more oblique. Spikes numerous, terminating 

 the main branches, i to 2 cm. long, about 1.5 mm. thick, recurved, 

 sharply quadrangular; sporophylls glaucous, yellowish brown with 

 age, readily detached, 2.4 to 2.7 mm. long (seta included), the blade 

 2.2 to 2.4 mm. long, 0.9 to 1.2 mm. broad, ovate, evenly long- 

 acuminate, setigerous (the seta 0.2 to 0.47 mm. long, greenish- 

 lutescent with a white tip, slightly scabrous), strongly concave, with 

 a deep dorsal groove throughout, freely short-ciliate, the cilia 25 to 

 32 on each side, close, stout, rigidly ascending, mostly 0.045 to 

 0.075 "''"^- lo''''g» the upper ones reduced. Megasporangia abortive 

 or wanting. Microsporangia very numerous ; microspores yellow, 

 about 0.022 mm. in diameter. 



Type in the U. S. National Herbarium, No. 591262, collected in 

 the Organ Mountains, Dona Ana County, New Mexico, at an altitude 

 of about 1,800 meters, January 9, 1909, by E. O. Wooton. There are 

 at hand three additional sheets of specimens collected in the same 

 range of mountains by Mr. Wooton on September 28, 1902, Septem- 

 ber II, 1904, and March 3, 1907, the last mentioned associated with 

 i\ rupincola Underw. 



The present species has hitherto been referred doubtfully to 

 5. higelovii Underw., of southern California, and this is clearly its 



