﻿130 Underwood : Selaginella rupestris and its Allies 



long white denticulate spine I mm. or more long ; margins strik- 

 ingly long ciliate, I 5-20 on either side ; spikes 1 cm. or less long, 

 borne laterally on the branches, scarcely quadrangular, the bracts 

 closely resembling the ordinary stem leaves so as to render the 

 spikes scarcely distinguishable except for the axillary sporangia ; 

 macrospores dark-yellow, 0.24-0.27 mm. in diameter, strongly 

 and deeply pitted reticulate. 



On perpendicular rocks, Organ Mts., Dona Ana Co., New 

 Mexico, alt. 6000 ft., E. O. Wooton, July 10, 1897. No. 2106 

 of Wright's collection, 185 1-2 (Herb. Kew) belongs here, as also 

 the erect plant of Palmer's no. 92, southwestern Chihuahua, 1885 

 (Herb. Kew) ; as represented in the Columbia herbarium, this 

 number includes a second creeping sterile plant which belongs to 

 a distinct species. A sterile plant in my herbarium, collected by 

 Tuomey in the Santa Catalina Mts., Arizona, also appears to be 

 the same species. 



The macrospores of this species are only about half the diam- 

 eter of those of 6". rupestris. The plant evidently approaches 

 what Milde had in mind in his var. Mexicana, but that is charac- 

 terized as having "rami laxius dispositi longiores " and a "seta 

 brevis parce denticulate," neither of which our plant possesses. 



^6. Selaginella Bigelovii sp. nov. 



Stems slender, 10-20 cm. long, mostly ascending, flexuous, 

 usually with short ascending primary branches; secondary 

 branches infrequent and mostly very short; stems rooting only 

 near the base ; leaves about six-ranked, appressed-imbricate, usu- 

 ally with a distinct dorsal channel, narrowly lanceolate, tapering 

 gradually into a densely spinulose white awn often 0.7 mm. long ; 



margins 



gins with 12-15 cilia on either side which are directed forward 

 and usually less than 50/. long; spikes obtusely quadrangular, 

 mostly on short lateral branches 5 mm. or less long the bracts 

 short, broadly ovate but otherwise like the leaves. 



The original specimens collected by Bigelow (Whipple's Expe- 

 dition) probably in California but without locality stated, appear 

 to be sterile, but specimens collected by me at Pasadena, California, 



January 



have a few 



fert.le spikes from which the characters above noted are derived. 

 Hie later specmens are usually more branched than those of 

 Bigelow's original collection but are otherwise closely similar To 



