Maryland Geological Survey 123 



flora. Combining the various contributions which have been made to the 

 subject yields the following list of species : 



flora of upper knoxville beds 



AMetites sp., Fontaine 



Acaciwphyllum elUpticum Fontaine^ 



Angiopteridium canmorense Dawson ? 



Angiopteridium strictinerve latifolium Fontaine 



Cephalotaxopsis magnifolia Fontaine ? 



Cladophlebis Browniana (Dunker) Seward 



CladophleMs parva Fontaine 



Cladophlebis Ungeri (Dunker) Ward 



CladophleMs virginiensis Fontaine 



Ctenis sp., Knowlton 



Cycadeospermum californicum Fontaine 



Dicksonia pachyphylla Fontaine 



Dioonites Buchianus (Ettings.) Born. 



Dioonites Buchianus abietinus (Font.) Ward 



Dioonites Buchianus rarinervis Fontaine 



Equisetum texense Fontaine ? 



Gleichenia Nordenskioldi Heer ? 



Hausmannia ? californica Fontaine 



Matonidium Althausii (Dunker) Ward 



Nageiopsis longifolia Fontaine ? 



Nilsonia californica Fontaine 



Nilsonia Stantoni Fontaine 



Nilsonia ? sambucensis Ward 



Nilsonia schaumbergensis (Dunker) Nathorst 



Oleandra gfamince folia Knowlton 



Onychiopsis psilotoides (Stokes & Webb) Ward ? 



Protewphyllum californicum Fontaine * 



Pterophyllum ? lowryanum Ward 



Sagenopteris elliptica Fontaine 



Sagenopteris Mantelli (Dunker) Schenk 



Sagenopteris nervosa Fontaine 



Sequoia Reichenbachi (Gein.) Heer 



Tceniopteris sp., Knowlton 



Zamites arcticus Goeppert 



Zamites tenuinervis Fontaine 



The foregoing list includes 1 equisetum, 14 ferns, 14 cycads, and 4 

 conifers. It shows 15 species identical with Potomac forms and several 



^ This was identified as A. pachyphyllum by Fontaine but is identical with 

 A. ellipticum. It is not an Angiosperm nor is it related to what this author 

 called Acacicephyllum from the Potomac which is referred to Thinnfeldia. 



^ This is an absolutely unidentifiable fragment and might be a fern, cycad, 

 gymnosperm or angiosperm. 



