49 



this fern cannot be positively known as long as its fructification has not been 

 discovered. 



Habitat. — Kansas. Recently discovered and communicated by Profes- 

 sor Mudge, 



PHAENOGAMOUS PLANTS. 



Cycadece. 

 1. Pterophyllum % haydenii, Lesqx., PL i, Figs. 6 and 6 b . 



Frond linear, simply pinnate ; racbis rugose, half an inch broad or more, marked by circular dots in 

 vertical rows and regularly placed about bait' a centimeter distant, apparently scars of tbo points ot 

 attachment of the pinnse ; pinnae entire, oblong, oval-obtuse, slightly arched on the lower side, flat, 

 attenuated at the round point of connection to the rachis, regularly and narrowly striated lengthwise. 



Pterophyllum haydenii, Lesqx. in part, American Journal of Science and 

 Arts, loc. cit., p. 97. 



In the paper above referred to, I considered the fragments here described, 

 together with a cone, as referable to the genus Pterophyllum from their like- 

 ness to vegetable organs of the same kind described and figured by Stiehler, 

 in Palceont., vol. v, p. 76, PL xv, Figs, a and d, under the name of 

 Pterophyllum ernestinoe. I have seen nothing since, in the publications of 

 recent authors, which might give any clue to the true relation of this vegeta- 

 ble. Its parts as represented, Figs. 6 and 6 b , are evidently related by their 

 form and characters to Stiehler's species, and referable at least to the same 

 genus, the frond merely differing by the pinnse attenuated at the base and 

 not sessile in their whole width ; by the smaller size of these pinna? and the 

 slender close striae with which they are marked. In considering Stiehler's 

 species, Schimper only remarks, in Pal. Veget., p. 139, that probably this veg- 

 etable should be separated from the genus Pterophyllum, on account of the 

 thickness of the rachis. But the plant is left by him with sjjecies of uncer- 

 tain affinity. The cone, too, by its likeness to that of Stiehler's, Fig. d, was 

 for the same reason referred to the same kind of vegetable. I have followed 

 Professor Heer's advice in separating it as rather referable to Conifers 



Habitat. — Near Decatur, Nebraska, Hayden. 



Conifer re. 

 Abietites Ernestine, Lesqx., PL i, Fig. 7. 



Cone oblong, abruptly narrowed to a short pedicel, scales broad, truncate, appressed and imbricated 

 in spiral. 



7 L 



