722 IDAHO MINING DISTRICTS. 



arching upward. The lowest pinna is lanceolate, deeply cut, with 

 oblong, obtusely acuminate segments. It is 2 cra in length. The other 

 most perfect pinna is 1.5 cm in length, and is also lanceolate in outline, 

 but has only one pair of segments at base, the remainder being merely 

 undulate. The nervation consists of forked veins arising from a 

 rather strong midvein in each segment. 



As no fruit is preserved, its proper generic reference becomes ques- 

 tionable, and dependence must be placed on its resemblance to the 

 described forms of which the systematic position is known. It has, 

 for example, some resemblance to what has been described as Las- 

 trc&a fischeri Heer, from the Swiss Tertiary, and also John Day Val- 

 ley, Oregon, but differs in being hardly one-half the size and in 

 having forked instead of simple nerves. 



On the whole, this appears to approach most closely certain species 

 of Aspidium (now Dryopteris) from the Tertiary of Switzerland. 

 Among them may be mentioned A. filix-antiqua Heer, A. meyeri 

 Heer, and A. elongatum Heer, all described and figured in Heer's 

 Flora Tertiaria Helvetia?, Vol. I, PI. XL 



Locality: One mile southeast of Marsh post-office, Boise County, 

 Idaho. 



EQUISETUM sp. 



There are several Equisetum stems in the collection. They are all 

 underground portions of stems, showing the scars of rootlets. From 

 one stein that is shown in cross section it appears that they are about 

 12-ribbed. They vary in width from l cm to 2 cm . 



These stems appear to most resemble E. ivyomingense Lx., 1 from the 

 vicinity of Green River, Wyoming, also identified by Newberry 2 at 

 probably the same locality, but there are differences, which make it 

 advisable to keep them apart. I have not given a name to this form, 

 hoping that more and better material could be obtained. 



Locality: Idaho City, Idaho. 



PlNUS Sp. 



PI. XCIX, fig. 3. 



The collection contains a single nearly perfect fruit. 

 Locality: Idaho City, Idaho. 



SEQUOIA ANGUSTIFOLIA ? Lx. 



PI. XCIX, fig. 4. 

 Sequoia angustifolia Lx., Cret. and Tert. Fl., p. 240, PI. L, fig. 5, 1883. 



This species was described by Lesquereux from Elko Station, 

 Nevada, in strata supposed to be of Green River Group age. He also 

 reported the same species from Corral Hollow, California. The figure 



Tert. PL, p. 69, PL VI, figs. 8-11. 

 a Of. plates ined., PL LXV, flg. 8. 



