FLORA OF TllF KOOIANIK FORMATION. 291 



Fnniily P()LYP( )I)I ACE.E. 

 (i.Mius CLADOPIILKBIS liiun-nuut. 

 Cladophlkkis km.c. \ia monianknsis l-'oiuaiiic ii. coinl). 

 PI. I -XXI, Fio;s. 11 JO. 



ii'i). 



ISOS. Thlnnfehliii niouldncnsis l'"(>iii. in WCimI tVc I'irsson: l-".i;_rliU'('nili .Viiii. iti 

 I'. S. (\on\. Surv., IS'.k; !I7, I't. 1[F |i. isi. 



Plant probably arboi'oscent ; so far as soon, tripinnutifid. Only 

 fragmonts of pimije have been fonnd. Those contain a varied number 

 of portions of pinmip, showing piinuiles on difTorent i)ai1s of the piniue, 

 and as the specimens are numei'oiis a pretty jjood idea of different parts 

 of the plant can be formed. The rachisos of the piniue are strong; and 

 rifiid. The j)iniuiles vary in character with their position on the [)iiiiia> 

 and fronds. Low down on the piniue and frond th(\v are long, linear, 

 and narrow, narrowing \'ery gradually from their bases to their tips. 

 T'ragments have l)een 45 mm. long and 5 mm. wide, indicating an entire 

 pinnule considei-ably longer. These have not been found attached, 

 although several occur together on some of the specimens, as if coming 

 from the same rachis. These pinnules June their margins more or less 

 incised, as represented in PI. LXXI, Fig. 15, the incisions varying in 

 depth from crenulations to rounded lobes cut halfway down to the 

 midnerve. These forms indicate that lower down on the frond the 

 lobes will pass into pinnules of the normal kind. Higher up on the 

 pinnae and frond the crenulate pinnules become entire, giving what we 

 may call normal pinnules. Toward the ends of the piniue and througli- 

 out those of higher parts of the frond the pinnvdes become smalloi' and 

 more and more vmited. The normal pinnvdes from the middle of the 

 pinna? are about 3 cm. long, as shown in PL LXXI, Fig. 17. They 

 are widest at base and separate, but are very closely placed. They are 

 strongly falcate, alternately placed, and narrow gradually to a sul)- 

 acute tip. 'I'he pinnules had apparently a coriaceous texture, so that 

 the fossils have a rigid aspect. They ai'o united to the rachis by tlioii' 

 entire base, which is expanded and lias the midnerve eccentrically 

 placed, so that the width of the lamina of the pinnule in front of or 

 above it is greater than that of the portion below. 



