136 



PLANTsE. 



[PSI. RHA. 



Hist., vol. 6, p. 420, and Geo. Sur. Pa., 

 vol. 2, p. 862, Coal Meas. 



numrnularia, Gutbier, 1842, Abdrucke u. 

 Verst. d. Zwick. Schwarzk. u. Seiner. 

 Umgebungen, p. 43, and Coal Flora of 

 Pa., p. 752, Coal Meas. 



obtusiloba, Brongniart, 1828, (Sphenop- 

 teris obtusiloba,) Hist. d. Veg. Foss., 

 p. 204, and Coal Flora of Pa., p. 753, 

 Coal Meas. 



pluckeneti, Schlotheim, 1820, (Filicites 

 pluckeneti,) Petrefaktenkunde, p. 410, 

 and Coal Flora of Pa., p. 199, Coal 

 Meas. 



polyphylla, Lindley & Hutton, 1835, 

 (Sphenopteris polyphylla,) Foss. Flora, 

 vol. 2, pi. 147, and Coal Flora of Pa., 

 p. 218, Coal Meas. 



pusilla, Lesquereux, 1854, (Pecopteris pu- 

 silla,) Bost. Jour. Soc. Nat. Hist., vol. 

 6, p. 424, and Geo. Sur. Pa., vol. 2, p. 

 866, Coal Meas. 



sheaferi, Lesquereux, 1858, (Pecopteris 

 sheaferi,) Catal. Potts. Ass'n, p. 11, and 

 Coal Flora of Pa,, p. 194, Coal Meas. 



sillimani, Brongniart, 1828, (Pecopteris j 

 sillimani,) Hist. d. Veg. Foss., p. 353, 

 and Coal Flora of Pa., p. 206, Coal 

 Meas. 



speciosa, Lesquereux, 1880, Coal Flora of 

 Pa., p. 216, Coal Meas. 



spinulosa, Lesquereux, 1870, (Alethop- 

 teris spinulosa,) Geo. Sur. 111., vol. 4, 

 p. 396, Coal Meas. 



subcrenulata, Lesquereux, 1880, Coal 

 Flora of Pa., p. 193, Coal Meas. 



subnervosa, Roemer, F. A., 1860, Paleon- 

 tographica, vol. 9, p. 192, and Coal 

 Flora of Pa., p. 198, Coal Meas. 



trifoliata, Artis, 1825, (Filicitestrifoliatus,) 

 Anted. Phytol., pi. 2, and Coal Flora 

 of Pa., p. 217, Coal Meas. 



virginiana, Meek, 1875, (Cyclopteris vir- 

 giniana,) Bull. Phil. Soc. of Washington, 

 p. 18, and Coal Flora of Pa., p. 217, 

 Waverly Gr. 



PSILOPHYTON, Dawson, 1859, Quar. Jour. 

 Geo. Soc., vol. 15, p. 478. [Ety. psilon, 

 smooth ; phyton, stem.] Stems dicho- 

 tomous; young branches carinate; 

 rhizomes cylindrical, villous or scaly ; 

 marked with round scars, points of at- 

 tachment of cylindrical rootlets ; leaves 

 in spiral order, small or rudimentary, 

 acicular, squarrose, open ; fructifications 

 in small, naked sporanges, spindle- 

 shaped or clayate, axillary, or in pairs 

 at the extremity of the branches. Type 

 P. princeps. 



cornutum, Lesquereux, 1877, Proc. Am. 

 Phil. Soc., p. 165, Low. Held. Gr. 



elegans, Dawson, 1862, Quar. Jour. Geo. 

 Soc., vol. 18, p. 315, Devonian. 



glabrum, Dawson, 1862, Quar. Jour. Geo. 

 Soc., vol. 18, p. 315, Devonian. 



gracillimum, see Dendrograptus gracil- 



limus. 



princeps, Dawson, 1859, Quar. Jour. Geo. 

 Soc., vol. 15, p. 479, Upper Silurian and 



Devonian. This is the oldest known 



Slant in America. It is supposed to 

 ave grown in a marsh. 



FIG. 67. Psilophyton priuceps. 



princeps var. ornatum, Dawson, 1871, 

 Foss. Plants, p. 38, Devonian. 



robustium, Dawson, 1859, Quar. Jour. Geo. 



Soc., vol. 15, p. 479, Devonian. 

 Ptilocarpus, Lesquereux, 1870, Geo. Sur. 111., 

 vol. 4, p. 493, Syn. for Cardiocarpon. 



bicornutus, see Cardiocarpon bicornutum. 

 Ptilophyton, Dawson, 1878, Scottish Devonian 

 Plants in Can. Nat., vol. 8. This is 

 founded upon Lycopodites vanuxemi 

 as the type, which is the same as Plu- 

 malina plumula, and falls therefore as 

 a synonym. 



gracile, see Plumalina gracilis. 



lineare, Lesquereux, see Plumalina linearis. 



plumula, see Lycopodites plumula. 



vanuxemi, syn. for Plumalina plumula. 

 RHABDOCARPUS, Gceppert & Berger, 1848, De 

 Fruct. et Sem., p. 20. [Ety. rhabdos, 

 stria ; karpos, fruit.] Seeds ovate or 

 oblong, costate or striate, acute or acu- 

 minate, surrounded by a putamen some- 

 times deficient. Type R. tunicatus. 



abnormalis, Lesquereux, 1884, Coal Flora 

 of Pa., p. 818, Coal Meas. 



acuminatus, Newberry, 1873, Ohio Pal., 

 vol. 1, p. 378, Coal Meas. 



amygdaliformis, Goappert & Berger, 1848, 

 de Fruct et Sem., p. 21, Coal Meas. 



apiculatus, Newberry 1873, Ohio Pal., 

 vol. l,p. 377, Coal" 

 Meas. 



arcuatus, Lesque- 

 reux, 1861, Geo. 

 Sur. Ky., vol. 4, 

 p. 434, Coal Meas. 



beinertianus, Goep- 

 pert & Berger, 

 1848, De Fruct. et. 

 Semin., p. 20, and 

 Coal Flora of Pa., 

 p. 844, Coal Meas. 



bockshianus, Gcep- 

 pert & Berger, 

 1848, De Fruct. et 

 Semin. p. 21, and 

 Coal Flora of Pa., 

 p. 844, Coal Meas. FIG. 68. Khabdocarpus 



carinatus, New- carinatus. 



berry, 1873, Ohio Pal., vol. 1, p. 376, 

 Coal Meas. 



clavatus, Sternberg, 1820, (Carpolithes 

 clavatus,) Vers. Darst. Flora der Vor- 



