120 



PLANTS. 



[HIP. KM). 



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

 having five rays ; transversely wrinkled. 

 Type H. stelfiforme. 

 stelliforme, Miller & Dyer, 1878, Cont. to 

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

 HlPPODOPHTCUB, 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 



f)re8sed between thumb and finger, 

 eaving a rounded rim on three sides of 

 the disc, the compressed margin being 

 truncate. Type H. cowlesi. 

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

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

 ung Gr. 

 Hymenophyllitk8, Gceppert, 1836, Syst. 

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

 menophyllum.] Frond membranaceous, 

 many times regularly pinnately divided 

 or irregularly cut, lobed with pinnatitid 

 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. 

 alaius, see Sphenopteris alata. 

 arborescent, see Rhacophyllum 



arborescens. 

 hallmitini, see Sphenopteris 



ballantini. 

 capillaris, Lesquereux, 1858, 

 Geo. Sur. Pa., v«.l. 2, p. 863. 

 Coal Meas. 

 f7r/r£<',see Rhacoyhyllum clarki. 

 curtilobus, Dawson, 1862, Quar. 

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

 321, and Acad. Geol., p. 552; 

 Devonian, 

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



Foss , p. 185, Coal Meas. 

 JUxicaulis, see Sphenopteris flexicaulis. 

 furcatut, see Sphenopteris furcata. 

 gersdorfi, Gceppert, 1836, Syst. Filic. Foss. 



Devonian. 

 giganltus, see Rhacophyllum lactuca. 

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



132, Coal Meas. 

 hildrethi, see Sphenopteris hildrethi. 

 infiatus, 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, Gceppert, 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. 



Fig. 40. 

 Hymeuo- 



pnyllites 

 curtilobus. 



spinosus, see Sphenopteris spinosa. 



splendens, see Sphenopteris splendens. 



strongi, see Rhacophyllum strongi. 



subfuroatus, 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 Sphenopteris tricho- 

 manoides. 



tridactylites, see Sphenopteris tridaetylites. 

 Ichnophycus, Hall, 18.">l\ 

 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, 

 tin- middle stem beim; 

 the longer. Tvpe 1. Fig. 41.— Iobno- 

 tridactylum. ptayooi trldacty 



tridactylum, Hall, 1852, lum 



Pal. N. Y., vol. '_', p. 26, Clinton Gr. 

 Idiophyllum, Lesquereux, 1880, Coal Flora 

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

 phyllon, leaf] Leaves small, round, or 

 broadly obovate ; medial nerve thick, 

 gradually narrowed and effacing i" 

 joining the borders ; lateral secondary 

 veins sub-opposite, thick, passing in an 

 inside curve toward the borders, grad- 

 natty effaced in the reticulation ; 



venules more or less continuous ; ioi 



times crossing each other in contrary 

 directions, and forming, by intersec- 

 tions, quadrate or rbomboidal meebea. 

 Tyj>e I. rotundifolium. 



rotumlifolium, I.isqiiereux, 1.S80, Coal 

 Flora of Pa., p. 100, Coal Meas. 

 Knorria, Sternberg, 1826, Kssai d, Exp. 



Geogn-liotan. il. 1. Flor. da .Monde prini- 



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. 



