250 IVIESOZOK^ FLORAS OF rxriKD STATES. 



DiooxiTEs BucHiAXi's AiuETiNis (Goppert) Ward n. comb." 



PI. LXVII, Figs. 1-3. 



1846. Pterophi/llum ahutintim GOpp. in Dunker: 



Monogr. d. Xorddeutsch. Wealdenhildimg, j). !■"), pi. vii, fig. 2. 

 ISol. DinomteH abiethuis (Gopp.) Miqucl: Tijdsclir. v. d. Wis-en Xaturk. Wetensch. 



V. li. Kon.-Ned. Inst. Aiiistcrdain, Deel IV, p. 212 [S]. 

 1SS9. Dloori'ites Buchianus angmtifolius Font.; Potomac Flora (Monogr. V. S. Gcol. 



Surv., Vol. XV), p. IS.5; pi. Ixvii, fig. 6: pi. Ixviii, fig. 4: ]-,]. Ixxi, fig. 2 

 1894. Dioonites Buchianus angustifoUufi Font, in Diller t^ Stanton: Bull. Geol. Soc. 



Am., Vol. V, p. 450. 

 1894. Zamiophyllum Buchianus amjustlfolia (Font.) Yok. : Jour. Coll. Sci. Ini]), 



Univ. Japan, p. 224, pi. xxii, fig. 4: pi. xxv, fig. ."): pi. xxviii. figs. 8, 9. 



Detached fragments of leaflets similar to Dioonites Buchianus 

 ahietinus Font., a plant occurring in the Lower Potomac of Virginia, 

 were found sparingly at localities Nos. 1, 9, 17, 19, and 20. Like 

 the similarly detached fragments resembling leaflets of D. Buchianus, 

 these are of doubtful character. But at locaUty No. 5, in the base of 

 the Horsetown beds, undoubted specimens, 5 in number, were found 

 of this plant. It is to be noted that the undoubted specimens of both 

 forms of D. Buchianus occur in the lower portion of the Horsetown beds. 

 The specimens have the leaflets attached to the midrib, and they are 

 uniformly narrow, even when attached, as in PI. LXVII, Fig. 1, low 

 down on the midrib. 



One specimen of this plant was collected in Oregon. This specimen 

 is a fragment of a leaf that shows 7 cm. of its length, with several leaflets 

 on the left side of the midrib. The leaflets go off very obliquely and 

 only their basal portions are preserved. They are 2 mm. wide, and the 

 nerves are not visible. This plant resembles the Potomac form depicted 

 in Monograph XV of the United States Geological Survey, pi. Ixvii, fig. 6. 

 It was collected by Mr. Will Q. Brown from a locality about one-fourth 

 of a mile above the town of Riddles in Oregon. It occurs in a fine-grained 



"Professor Fontaine in liis Potomac Flora, p. 185, identified the Virginia plant with the form from Uio 

 Wealdeii of north Germany, which Dunker submitted to Goppert and whidi the latter in a letter to Dunker 

 named Phiophiilluin ahielmiiin. Miquel five yeai-s later referred it to Dioonites. Although Professor Fontaine 

 redu<'ed it to a subspecies of Diooniles linchiiinii.i (Ett. ) Born., still under the mlesof nomenclature the original 

 name of Ciiippert can not on that account be taken from it , but must remain as the name of the subspecies. The 

 alnn-e combination must therefore be substituted for the name that Professor Fontaine gave it (Dioonites 

 Buchianus aminstifolius. — L. F. W. 



