NO. 5 NEW SELAGINELLAS — MAXON 5 



(Rose & Painter 7499) from the same locality. The essential char- 

 acters are as follows : Stems very firm, stiff, the branches rigid, not 

 intricate ; leaves of lower side closely appressed-imbricate, lance- 

 attenuate, 2.7 to 3.2 mm. long, 0.6 to 0.7 mm. broad, with about 15 to 

 20 slender, mostly ascending cilia on each side in the lower half or 

 two-thirds (these 0.06 to 0.12 mm. long), the apical third with 

 pungent serratures ; leaves of the upper side crowded, rigidly vertical 

 or recurved, narrowly deltoid, evenly acuminate, i to 1.2 mm. long, 

 0.4 to 0.5 mm. broad, with about 13 to 16 cilia on each side, these 

 mostly oblique and incurved, 0.055 to 0.085 rn"^- lo"g'' the upper ones 

 passing into broad pungent serratures ; sporophylls deltoid-ovate, 

 narrowly long-acuminate, 1.7 to 2 mm. long, 0.85 to i mm. broad, 

 variable in ciliation, sometimes with as many as 20 stiff, rigidly 

 ascending, mostly incurved cilia in the basal half (these 0.03 to 

 0.06 mm. long) and elsewhere serrate, or with short ascending teeth 

 along the whole margin above the extreme base (here with a few 

 cilia). Megaspores yellow, subglobose, about 0.33 mm. in diameter, 

 rugulose-reticulate, the ridges projecting sharply, less than 0.008 mm. 

 broad. 



These three species, 5". eremophila, S. parishii, and 5". landii, while 

 readily distinguished specifically, are by no means typical members 

 of the group of S. rupestris, and together with the next species 

 {S. arizonica) form a fairly well-defined subgroup. The pronounced 

 dorso-ventral habit and subdimorphous leaves are doubtless to be 

 associated with their strongly xerophilous habitat. 



SELAGINELLA ARIZONICA Maxon, sp. nov. 



(PI. 3) 

 Plants wholly prostrate, the main stems up to 20 cm. long, rooting 

 at intervals throughout, pinnately branched, the branches i to 1.5 cm. 

 apart on each side, the lower and middle ones 2.5 to 6 cm. long, twice 

 pinnate, the ultimate branches broadly subclavate, short, subdistant, 

 all the parts densely leafy, dorso-ventral, involute. Leaves crowded, 

 in six ranks, those of the under side the largest, appressed-imbricate, 

 oblique laterally, linear-lanceolate, acuminate, not setigerous, 2.5 to 

 2.8 mm. long, 0.5 to 0.6 mm. broad, thin-herbaceous, yellowish brown, 

 evenly ciliate, the cilia 18 to 22 on each side, oblique, up to o.ii mm. 

 long, the apical ones reduced ; leaves of the upper side subulate, 1.8 to 

 2.2 mm. long, 0.3 to 0.44 mm. broad, evenly attenuate to the acutish, 

 whitish-marginate, short-setigerous apex (the seta dirty white, stout, 

 0.15 to 0.28 mm. long, serrate, often reflexed, present only in the 



