428 Systematic Paleontology 



material, furnished abundant four-valved cones which induce Velenovsky 

 and Krasser to advocate its reference to Widdrmgtonia. Widdringtonites 

 subtilis Heer which is common in the later Cretaceous of the Coastal Plain 

 has also furnished somewhat poorly preserved cones of this type in 

 material collected by the writer in South Carolina, and well preserved 

 attached cones in material from the Tuscaloosa formation in Alabama-, 



There can be but little doubt of the actual genetic relationship be- 

 tween these Mesozoic conifers and the existing species of Callitris, Wid- 

 dringtonia, and Frenela which Eichler lumps into the single genus 

 Callitris Vent. At the present time they constitute a restricted group 

 confined to the Australian region on the one hand {Frenela) and to 

 northern Africa (EucalUtns) and southern Africa and Madagascar 

 (Widdringtonia) on the other. In former geological periods they were 

 much more abundant as is partially shown by the accompanying sketch 

 map, which, however, is designed to show only their reported range in 

 the Mesozoic and does not include the quite numerous Cenozoic records. 

 It will be seen that Frenelopsis is recorded in America from Greenland 

 to Texas and Widdringtonites from G-reenland to Alabama. Abroad 

 both types occur abundantly in central and western Europe. Like 

 so many other types of plants which were widespread in Mesozoic 

 times they became during the Tertiary more and more restricted in their 

 range until today they are not found at all in the western hemisphere 

 and are confined to the limited areas indicated on the accompanying 

 sketch map. (Pig. 15.) 



Eeferring only to Cretaceous species of Widdringtonites we find four 

 in the Neocomian, one in the Barremian, one in the Albian, three in the 

 Cenomanian and one in the Senonian. The corresponding occurrences 

 of the allied species of Frenelopsis are discussed under that genus. 



Widdringtonites eamosus (Fontaine) Berry 

 Plate LXXIII, Figs. 1-6 



Taxodium (Glyptostro'busJ ramosum Fontaine, 1890, Mon. U. S. Geol. Surv., 

 voL XV, 1889, p. 251, pi. cxxiii, figs. 2, 3; pi. cxxiv, fig. 2; pi. cxxvii, 

 fig. 1; pi. cxxxil, fig. 1; pi. clxvi, fig. 1. 



