126 



PLANTsE. 



MAC. MBG. 



plumula, see Plumalina plumula. 



richardsoni, Dawson, 1863, Quar. Jour. 

 Geo. Soc., vol. 19, p. 461, Devonian. 



simplex, Lesquereux. 1884, Coal Flora of 

 Pa., p. 779, Coal Meas. 



strictus, Lesquereux, 1880, Coal Flora of 

 Pa., p. 360, Coal Meas. 



uncinatus, Lesquereux, 1866, (Selaginites 

 uncinatus,) Geo. Sur. 111., vol. 2, p. 446, 

 . Coal Meas. 



vanuxemi, Dawson, 1862, Quar. Jour. Geo. 

 Soc., vol. 18, p. 314, Syn. for Plumalina 

 plumula. 



MACROSTACHYA, Schimper, 1869, Traitfe de 

 Palfeontologie Vegetale, vol. 1, p. 332. 

 [Ety. makros, long; stachys, a plant.] 

 Plants arborescent, articulate ; articula- 



' tions close ; cortex thin, smooth or 

 striate ; impressions of the internal sur- 

 face plano-costate ; furrows narrow, al- 

 ternating at the articulations; leaves 

 appressed, linear, carinate or marked 

 with a medial nerve, acuminate, finely 

 truncate ; leaf gears marked upon the 

 articulations by transversely oval rings, 

 like the links of a chain ; scars of 

 branches verticillate, large, round, um- 

 bonate, with a stigmarioid central mam- 

 ilia ; spikes very large, cylindrical ; 

 bracts lanceolate, costate in the middle, 

 imbricate, scarcely longer than the in- 

 ternodes. Type M. infundibuliformis. 



aperta, Lesquereux, 1858, (Asterophyllites 

 apertus,) Geo. Sur. Pa., vol. 2, p. 852, 

 Coal Meas. 



communis, Lesquereux, 1884, Coal Flora 

 of Pa., p. 828, Coal Meas. 



infundibuliformis, Brongniart, 1828, 

 (Equisetum infundibuliforme,) Hist. 

 Veg. Foss., t. 1, p. 119, Coal Meas. 



lanceolata, Lesquereux, 1858, (Astero- 

 phyllites lanceolatus,) Geo. Sur. Pa., 

 vol. 2, p. 852, Coal Meas. 



minor, Lesquereux, 1884, Coal Flora of 



Pa., p. 829, Coal Meas. 

 MEOALOPTERIS, Dawson, 1871, Foss. Plants 

 Dev. and Up., Sil. Formations, p. 51. 

 [Ety. megak, great ; pteris, fern.] Fronds 

 very large, pinnate, ultimate pinnae 

 oblique, sublinear or lanceolate, entire, 

 the lower side broadly decurrent on the 

 rachis, which thus becomes alate, the 

 upper narrowed in a curve, confluent ; 

 midrib thick, canaliculate on the upper 

 surface, half cylindrical on the lower, 

 gradually narrowed, but distinct to the 

 apex of the leaves; veins open, emerg- 

 ing from the rachis in a more open 

 angle of divergence, curving upward in 

 reaching the borders, close dichotomous. 

 Type M. dawsoni. 



abbreviata, Lesquereux, 1880, Coal Flora 

 of Pa., p. 151, Coal TVIeas. 



dawsoni, Hartt, 1868, (Neuropteris daw- 

 soni,) Acad. Geol., p. 550, Devonian. 



dentata, Lesquereux. 1884, Coal Flora of 

 Pa., p. 833, Coal Meas. 



fasciculata, Lesquereux, 1880, Coal Flora 

 of Pa., p. 150, Coal Meas. 



hartti, Andrews, 1875, Ohio Pal., vol. 2, 



p. 416, Coal Meas. 

 lata, Andrews, 1875, Ohio Pal., vol. 2, p. 



417, Coal Meas. 

 marginata, Lesquereux, 1880, Coal Flora 



of Pa., p. 152, Coal Meas. 

 minima, Andrews, 1875, Ohio Pal., vol. 2, 



p. 416, Coal Meas. 

 ovata, Andrews, 1875, Ohio Pal., vol. 2, 



p. 417, Coal Meas. 

 rectinervis, Lesqnereux, 1884, Coal Flora 



of Pa., p. 744, Coal Meas. 

 serrata, Lesquereux, 1884, Coal Flora of 



Pa., p. 834, Coal Meas. 



FIG. 51. Megalopteris southwelli. 



southwelli, Lesquereux, 1880, Coal Flora 



of Pa., p. 148, Coal Meas. 

 MEGAPHYTON, Artis, 1828, Antedil. Phytol., 

 p. 20. [Ety. megas, great ; phyton, a 

 plant.] Scars large, round-quadrate in 

 outline, mostly contiguous, placed in 

 opposite biserial rows; internal disks 

 convex, with central or vascular im- 

 pressions in the form of a horseshoe, 

 or a medial band dividing the disks 

 into two lobes, joined 

 in the middle. Type 

 M. frondosum. 



goldenbergi, Weiss, 

 1860, Zeitsch d. 

 deutsch Geo. Ge- 

 sellsh. XII, p. 510, 

 Coal Meas. 



grandeuryi, Lesque- 

 reux, 1880, Coal 

 Flora of Pa., p. 350, 

 Coal Meas. 



humile, Dawson, 1863, 

 Can. Nat. and Geol., 

 vol. 8, and Acad. 

 Geol. p. 486, Coal 



M , eas .- . FIG. 52.-Megaphy- 



maclayi, Lesquereux, ton protuberann. 



1866, Geo. Sur. 111., 



vol. 2, p. 458, Coal Meas. 

 magnificum, Dawson, 1863, Can. Nat. and 



Geol., vol. 8, and Acad. Geol., p. 486, 



Coal Meas. 



