6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 72 



young leaves, caducous), ciliate (the cilia 4 to 8 on each side, ascend- 

 ing, pungent, 0.04 to 0.09 mm. long, passing into short serratures at 

 the apex), at first bright green, grayish with age, rigidly herbaceous 

 from a thick spongiose base, rigidly ascending, with age nearly 

 vertical in the older branches, flat above, slightly convex dorsally 

 and deeply sulcate nearly to the tip. Spikes ascending, terminating 

 the short ultimate divisions of the larger branches (or the divisions 

 wholly fertile), sometimes numerous, 2 to 5 mm. long; sporophylls 

 narrowly ovate-deltoid, 1.5 to 1.95 mm. long, 0.75 to 0.85 mm. broad, 

 evenly long-acuminate, at first barely setigerous (the seta 0.15 to 

 0.25 mm. long, broad, pointed, serrulate, dirty white), subcarinate, 

 ciliate, the cilia 18 to 22 on each side, stout, rigidly ascending, mostly 

 0,03 to 0.06 mm. long, the upper ones greatly reduced, dentiform. 

 Megasporangia numerous, basal, or sometimes interspersed among 

 the microsporangia ; megaspores pale yellow, subglobose, 0.36 mm. 

 in greatest diameter, coarsely reticulate on the outer face ( the ridges 

 sharp and narrow), finely reticulate on the commissural faces; com- 

 missural costae long, delicate. Microsporangia numerous ; micro- 

 spores orange, about 0.035 rnm. in diameter. 



Type in the U. S. National Herbarium, no. 694327, collected at 

 the foot of Soldier Trail, Santa Catalina Movmtains, Arizona, altitude 

 about 960 meters, July 28, 1914, by Forrest Shreve. Other specimens 

 in the National Herbarium are as follows : 



Arizona: Sabino Canyon, Santa Catalina Mountains, alt. 870 

 meters, June 15, 1903, Thornber 315. Ventana Canyon, near Tucson, 

 1913, Cook. Pimo Canyon, near Tucson, February, 1913, Parish 

 8513. Arivipa Canyon, April, 1873, P. F. Mohr. Santa Catalina 

 Mountains, April 3, 1894, Tourney. Roosevelt Dam, on steep rocky 

 slopes, August 3, 1910, Goodding 722. Salt River Mountains, alt. 

 600 meters, November 9, 191 3, Bailey. Ray, 191 3, Bailey. 



Selaginella arizonica is related to 5*. eremophila, and to 5^. landii 

 and 6^. parishii, whose characters are given in detail under the last 

 preceding species. The disparity in size between the leaves of the 

 under and upper sides is far less in 6^. arizonica than in the others, 

 and it alone of the four species has the leaves and sporophylls at all 

 setigerous. It is a much larger and coarser plant than S. eremophila 

 and diflfers in nearly all technical leaf characters. 



SELAGINELLA ASPRELLA Maxon, sp. nov. 

 (PI. 4) 

 Plants forming a loose mat, the main stems 3 to 6 cm. long, creep- 

 ing but not prostrate, rooting at intervals throughout, with a few 



