210 NAGKIOPSIS. 



beds. Turning to Schenk's description, we find that he notes 

 the presence of rows of small tubercles on the branches as an 

 additional character, and describes the leaves as decussate and 

 opposite, and not four in each whorl as stated by Ettingshausen. 

 It may be that under Frenelopsis Hoheneggeri (Ett.) we have 

 more than one species ; the younger fragments, such as those 

 figured by Ettingshausen, and a few of those described by Schenk, 

 agree very closely with the English specimen of Thuites, but 

 the larger branches of Schenk may perhaps belong to another 

 plant. Ecclesbourne. Eu/ord Coll. 



Genus NAGEIOPSIS, Fontaine. 

 [Potomac Flora, 1889, p. 194.] 



Fontaine proposes this generic title for one of the most largely 

 developed and characteristic Potomac plants. He compares the 

 leaves with those of Podozamites, but is enabled by the large and 

 numerous specimens at his disposal to recognize distinct coniferous 

 features. He defines the genus as follows : 



"Trees or shrubs with leaves and branches spreading in one 

 plane ; leaves varying much in size and shape, those towards 

 the base of the twigs sometimes smaller than those higher up, 

 distichous mostly, or rarely subdistichous, opposite and persistent, 

 attached by a short, slightly twisted foot-stalk, usually to the 

 side of the twig, more rarely slightly within the margin on 

 the upper or under surface of the stem, either attenuated towards 

 the base or abruptly rounded off there, at their ends acute or 

 sub-acute ; nerves several, coalescing at base to form a foot-stalk, 

 forking immediately at the base or a short distance above, then 

 approximately parallel to near the tips of the leaves, where 

 they are somewhat crowded together, but do not converge to a 

 union, ending in or near the extremity." 



The genus Podocarpus is divided by Eichler 1 into four sections, 

 of which section i. is Nageia, formerly regarded as a distinct 

 genus. 2 In this form of Podocarpus the leaves have numerous 

 veins, and not a single midrib as in other species of the same 

 genus. 



1 Engler and Prantl, p. 104. 



2 E. G. Gordon, The Pinetum, p. 135 (1858). 



