.Hh'ASSIC FLORA OF DOUGLAS COUNTY, OKEG. 57 



To judfic fi'oiii tlic spociinons, the plant sliow.s a ina-rked tendency 

 to fiTietification, for most of theni are fertile parts. It is prohahh' a 

 new speeies. The stei'ile eiitii(> |)innul(>s r(>seinl)]e thos(> of Heer's Dick- 

 souid (//Y/r/Y/.s'," from the .iui-assic of Asia, hut the ultimate pinna' ai'e 

 shorter, and Heer's {)lant lacks the heteiomorphous featui'e in the 

 pinnules. 



Heel- calls attention to the resemhlance of iiis plant to the Sclc- 

 7-njiteris Poniclii of Saporta, from the .Jurassic of France. This resem- 

 blance exists, hut it is not sufficient to justify identifying the Oregon 

 foi'in with Sapoi'ta's fossil. Xo fructihcation exists on either of these 

 previously de.scrihed fossils, and in view of the predominance of it in 

 the Oregon fossils it is not likely that it would be wanting in the for- 

 mer if they are identical with the latter. In sliape and size the sori 

 of l)ii'l:>t()ni(i (irrgnne7isiff agree pretty well with those of Heer's Dick- 

 sonia clavi/ics,'' from the Jurassic of Siberia, but the fertile pimuiles 

 are not, as in that plant, contracted to stalks. So many specimens 

 of the plant now in question were oljtained that a pretty full repre- 

 sentation of it may be given l)y selecting parts from different positions 

 on the compound pinnae This is necessary because of the small size 

 of the fragments that are preserved. 



PL VI, Fig. 3, represents a portion of a penultimate pinna with 

 several attached ultimate pinnae, as well as several unattached ones, 

 that apparently were once attached. This is the only specimen in hand 

 that is credited to Mr. Todd's collections. It presents the upper sur- 

 face of the plant uppermost and shows the sori as they appear in such 

 a case. When this specimen was the only one available, I was let! to 

 regard it as Asjyidium monocarpuni, a fern found in the Lower Creta- 

 ceous of Great Falls, Mont. This is the specimen referred to as 

 Dryoptens mouncarpa by Pi'ofessor Ward in the paper quoted above 

 (]). 8()9). Specimens showing the same character are not unconmion 

 in the collections made since that of Mr. Todd, and they show that the 

 plant is Dicksonia oregonensis. PI. VI, Fig. 4, shows a single pinnule 



" Flor. Foss. Arct., Vol. IV, I'l. U (Beitriige ziir .liira-Klora Ostsibiticns mid des Amurlandes), p. 92, 

 pi. xvii, fig. .3. 



''Op. cit., pp. ;«-34, pi. ii, Cg. 7. 



I'The genus name Dryopteris (.Vdanson, 1763) liii.s priority over .Vspidiiun (Swartz, 1800) by twenty- 

 seven years. Dr. Knowlton referred Professor Fontaine's speeies (inoiiomrpa) to the former genus in his 

 Catalogue of the Cretaeeous and Tertiary Plants of North Ameriea (Bull. U. S. Geol. Survey Xo. l.')2. 1898), 

 p. 92.-L. F. W. 



