102 



GENERA OF UNCERTAIN POSITION 



[CH. 



Renault 1 has figured a portion of a large leaf from Autun as 

 Trichopitys Milleryensis which may belong to the closely allied 

 genus Dicranophyllum ; it is 12 cm. long and 3 mm. broad at the 

 base ; the narrow basal part of the lamina has three parallel veins 

 and forks into two arms, each of which again branches into 

 divergent linear segments. The leaf is larger and broader than 

 the leaves of T. heteromorpha and agrees very closely with those of 

 some species referred to Dicranophyllum : the fact that the branch- 

 ing of the lamina is not absolutely regular cannot be accepted as 

 a constant difference between Dicranophyllum and Trichopitys : 

 the leaves shown in fig. 671, which were found attached to un- 

 doubted Dicranophyllum branches, are no more regular in the 



FIG. 673. Trichopitys heteromorpha. (After Zeiller; $ nat. size.) 







forking of the segments than T. Milleryensis, and a leaf recen 

 figured by Dr Stopes 2 from New Brunswick as Dicranophyllum 

 glabrum (Daws.) bears a close resemblance to Renault's figure. In 

 some cases the more regular dichotomy of the leaves is a charac- 

 teristic of Dicranophyllum, but it is not a constant feature. Some 

 imperfectly preserved specimens figured by White 3 from the Coal 

 Measures of Missouri as Dicranophyllum sp. bear irregularly 

 branched leaves which are hardly distinguishable from some of 

 those on Saporta's type-specimen of Trichopitys heteromorpha. 



1 Renault (93) A. PL LXXXH. fig. 2 ; (96) A. p. 378. 



2 Stopes (14) p. 79, PL xvm. fig. 47. 



3 White (99) B. p. 272, PL ILL fig. 10; PL LXXIII. fig. 1. 



