120 



PLANTS. 



[HIP. KNO. 



phukos, sea-plant.] Star-like frond, 

 having five rays ; transversely wrinkled. 

 Type H. stelfiforme. 

 stelliforme, Miller & Dyer, 1878, Cont. to 



Pal. No. 2, p. 2, Hud. Riv. Gr. 

 HIPPODOPHYCCS, Hall & Whitfield, 1872, 24th 

 Rep. N. Y. St. Mus. Nat. Hist., p. 203. 

 [Ety. hippodos, horse-foot; phukos, sea- 

 plant.] Founded upon cavities in sand- 

 stone, having a form similar to that 

 which a putty ball will assume, when 



Eressed between thumb and finger, 

 saving a rounded rim on three sides of 

 the disc, the compressed margin being 

 truncate. Type H. cnwlesi. 

 cowlesi, Hall & Whitfield, 1872, 24th Rep. 

 N. Y. St. Mus. Nat. Hist., p. 203, Chem- 

 ung Gr. 



HYMENOPHYLLITES, Goeppert, 1836, Syst. 

 Filic. Foss. [Ety. from the genus Hy- 

 menophyllum.~\ Frond membranaceous, 

 many times regularly pinnately divided 

 or irregularly cut, lobed with pinnatifid 

 or dichotomous divisions, decurring on 

 a broad common rachis, which is some- 

 times indistinct ; veins pinnate, per- 

 current, solitary in each division. Type 

 H. gersdorfi. 



adnascens, see Rhacophyllum 



adnascens. 



alatus, see Sphenopteris alata. 

 arborescens, see Rhacophyllum 



arborescens. 

 ballantini, see Sphenopteris 



ballantini. 



capillaris, I>squereux, 1858, 

 Geo. Sur. Pa., vol. 2, p. 863. 

 Coal Meas. 



clarki,see Rhacoyhyllum clarki. 

 curtilobus, Dawson, 1862, Quar. 



Jour. Geo. Soc., vol. 18, p. 

 2 



FIG. 40. 

 Hymeno- 



321, and Acad. Geol., p. 55! 

 Devonian. 



delicatulus, Brongniart, 1828, Hist. d. veg. 

 Foss , p. 185, Coal Meas. 



flexicaulis, see Sphenopteris flexicaulis. 



furcatus, see Sphenopteris furcata. 



gersdorfi, Goeppert, 1836, Syst. Filic. Foss. 

 Devonian. 



giganttus, see Rhacophyllum lactuca. 



gutbieranus, Unger, 1850, Gen. et. sp., p. 

 132, Coal Meas. 



hildrethi, see Sphenopteris hildrethi. 



inftatus, see Rhacophyllum inflatum. 



lactuca, see Rhacophyllum lactuca. 



mollis, see Rhacophyllum molle. 



myriophyllus, Brongniart, 1828, (Sphen- 

 opteris myriophylla,) Hist. d. Veg. Foss., 

 p. 184, Coal Meas. 



obtusilobus, Goeppert, 1836, Syst. Filic. 

 Foss., Devonian. 



pentadactylus, Dawson, 1863, Can. Nat. 

 and Geol., vol. 8, and Acad. Geol., p. 485, 

 Coal Meas. 



pinnatifidus, Lesquereux, 1866, Geo. Sur. 

 111., vol. 2, p. 436, Coal Meas. 



schlotheimi, Brongniart, 1828, (Sphenop- 

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

 p. 193, Coal Meas. 



spinosus, see Sphenopteris spinosa. 



splendens, see Sphenopteris splendens. 



strongi, see Rhacophyllum strongi. 



subfurcatus, Dawson, 1868, Acad. Geol., 

 p. 55, Devonian. 



tenuifolius, Brongniart, 1828, (Sphenop- 

 teris tenuifolia,) Hist. d. Veg. Foss., p. 

 190, Coal Meas. 



thalliformis, see Rhacophyllum thalliforme. 



trichomanoides, see Splienopteris tricho- 

 manoides. 



tridactylites, see Sphenopteris tridactylites. 

 ICHNOPHYCUS, Hall, 1852, . 



Pal. N. Y., vol. 2, p. 26. 

 [Ety. ichnos, a foot- 

 print; phukos, a sea- 

 weed.] Tridactyle im- 

 pressions somewhat re- 

 sembling a foot-track, 

 the middle stem being 

 the longer. Type 1. FIG. 41. Ichno- 

 tridactylum. phycus tridacty- 



tridactylum, Hall, 1852, 



Pal. N. Y., vol. 2, p. 26, Clinton Gr. 

 IDIOPHYLLUM, Lesquereux, 1880, Coal Flora 

 of Pa., p. 159. [Ety. idios, peculiar; 



tton, leaf ] Leaves small, round, or 

 adly obovate ; medial nerve thick, 

 gradually narrowed and effacing in 

 joining the borders ; lateral secondary 

 veins sub-opposite, thick, passing in an 

 inside curve toward the borders, grad- 

 ually effaced in the reticulation ; 

 venules more or less continuous ; some- 

 times crossing each other in contrary 

 directions, and forming, by intersec- 

 tions, quadrate or rhomboidal meshes. 

 Type I. rotundifolium. 



rotundifolium, Lesquereux, 1880, Coal 



Flora of Pa., p. 160, Coal Meas. 

 KNORRIA, Sternberg, 1825, Essai d. Exp. 

 Geogn-botan. d.l. Flor. du Monde prirn- 

 itif fasc. 4, p. 37. [Ety. proper name.] 

 Trunks cov- 

 ered with 

 elongated 

 semiconical 

 or truncate 

 tubercles 

 placed in 

 spiral order 

 more or less 

 imbricated, 

 leaving, after 

 falling off, 

 round con- 

 vex marks, 

 with a single, 

 vascular scar 

 in the mid- 

 dle ; leaves 

 long, linear, 



more or less inflated at the base, with 

 a flat medial nerve. Type K. imbri- 

 cata. 



compacta, Lesquereux, 1884, Coal Flora of 

 Pa., p. 839, Coal Meas. 



imbricata, Sternberg, 1825, Flor. d. monde 

 primitif fasc. 4, p. 37, Kaskaskia Gr. 



FIG. 42. 

 Knorria Imbricata. 



