Diaffnosen von Marattiaceenarten. 25 



*ö 



darium basale catadromum superiores magnitudine longe 

 superans, figuraque sua peculiaris; est enim segmentum hoc 

 l'5cm longum in duos inaequales lobos, sinu plus minus alto 

 et lato divisum, quorum externus rotundatus et usque 1 cm 

 latus, rarius margine sinuosus, plerumque integer, internus 

 vero oblongus vel lanceolatus, vix ultra 4 mm latus, rhachin 

 primariam spectat; nervationem sterilis folii in superiore 

 pagina vix conspicuam, in aversa pagina melius expressam 

 videbis, in fertili folio est eadem in aversa pagina plerumque 

 totaliter fructificatione texta; nervus median us secunda- 

 rius debilis est et pinnatus, nervulos laterales et quidem 

 supremum simplicem, secundum furcatum, medios bifurcatos 

 basalesque furcatos vel simplices, erectos et curvatos con- 

 vexitate medianum spectante, radiantes ferens; fructificatio 

 quam huic speciei attribuendam credo, totam inferiorem paginam 

 occupat; sporangia globosa ellipsoidea pyriformia circiter 

 0'4mm longa, annulo rudimentali apicali instructa 1. tota 

 superficie reticulato-foveolata, apice impresso ubi foramen 

 exonerationem spororum facilitans situm esse suspicor, valde 

 compressa ideoque probabiliter tenerrime constructa et nume- 

 rosa. 



4. Sp. tenuifolius (Emmons) Krasser. 



1857 Odontopteris tenuifolius Emmons, Americ. Geology, Pt. VI, p. 105, 



tab. III, fig. 5. 

 1883 Acrostichides rhombifolius Fontaine, Older Mesozoic Flora of Virginia, 



Mon. U. S. Geol. Survey, vol. VI, p. 29, 105, tab. VIII, fig. 2, 2a, 3, da, 3b; 



tab. XI, fig. 1, la,2,3; tab. XII, fig. 1, la, 2; tab. XIII, fig. 1, 1^, 2; 



tab. XIV; tab. XLIX, fig. 7; et var. rarinervis Fontaine, 1. c, p. 32, 



tab. XII, fig. 3. 

 1900 Acrostichites tenuifolius (Emmons) Fontaine, Notes on fossil plants 



collectcd by Dr. Ebenezer Emmons from the older mesozoic rocks of 



North Carolina, in L. F. Ward, Status of Mesozoic Floras of U. S., I, 



XX. ann. Rep., 1898/99, Part II, V^ashington 1900, p. 287, tab. XXXIX, 



fig. 4. 

 1885 Sp. lunzensis Stur, I, p, 97, nomen solum! 

 1888 — Stur, II, p. 210. 



Folia fere gigantea 2-5 w longa, basi bO cm, in medietate 

 30 cm lata, in apicem sensim attenuata ambitu lanceolato-acu- 



