in J imOGGERIA, BARRANDEINA, BARINOPHYTON 37 



Broggeria. 



(Fig. 17.) 



Broggeria, Nathorst^, 1915. Stout branched axes, of which 

 some terminate in large cyhndrical sporangial sjjikes or catkins, 

 lip to 50 mm. long and 15 mm. broad. 



Distribution. Middle Devonian, Western Norwa}^; ? Upper 

 Devonian, United States. 



The stems recall species of Psilophyton, but the fructifications 

 are entirely dissimilar to anything known in that genus. 



Barrandeina. 

 (Fig.. 18.) 



Barrandeina, Stur^, 1881. Ribbed dichotomous axes; the ribs, 

 which are formed by deeurrcnt bases of lateral axes spirally 

 arranged, are longitudinal, irregular, broad, low, flat, nearly 

 contiguous, somewhat obscure. 



Distribution. Middle Devonian, Bohemia, ? Western Norway 

 and United States; Upper Devonian, United States. 



No fructification is known in connection with these remarkable 

 axes which appear to be largely made up of decurrent leaf bases. 

 The lower portion of the axis of Ptilophyton (see Fig. 12, p. 31) 

 appears to be somewhat similar and no doubt several of the 

 specimens from the Devonian of America attributed by Dawson 

 and Newberry^ to the genus Caulopteris belong here. 



Barinopiiyton. 

 (Fig. 19.) 

 Barinophjiton, D. White^, 1905. Axes thick, smooth or 

 irregularly ribbed, bearing alternate stout compact boat-shaped, 

 fertile branches, usually lanceolate, consisting of a very thick 

 llcshy keel, bearing on either side on its ventral surface, a row 

 of alternating small thick oblong or oblong-lanceolate scales or 

 bracts. Bracts fleshy at the base, more or less distinctly carinate, 

 provided with a small ventral pit or pocket, probably the seat 

 of a sporangium. 



1 Nathorst (1915). - Stur (1881); Potonie and Bernard (1904). 



3 Newberry (1889). * White (1905). 



