

XLIl] DICRANOPHYLLUM 99 



of 1-25 mm. The undivided portion of the lamina is about 7 mm. 

 long. Kidston speaks of the rhomboidal outline of the leaf and 

 the repeated dichotomy of the lamina as distinguishing features. 



Some fragments of forked leaves are figured by Schenk 1 from 

 the Coal Measures of China as Dicranophyllum latum, but the 

 material is too meagre for accurate determination. It is note- 

 worthy that the broader type of Dicranophyllum leaf may easily 

 be confused with an impression of a branched Stigmarian rootlet. 

 The narrower specimens described by Schenk from China as 

 D. angustifolium 2 are also too fragmentary to be accepted as 

 trustworthy evidence of the occurrence of the genus in the southern 

 flora. 



Dicranophyllum striatum Grand'Eury. 



This species like several others is founded on detached leaves 3 , 

 a circumstance that has led some authors to draw a distinction 

 between species with persistent leaves and those with caducous 

 leaves. There is, however, no good reason for assuming that all 

 species were not of the evergreen type. The leaves of this species 

 are characterised by their great length which may be 24 cm. ; 

 the lamina is once or twice forked and is 5 6 mm. broad at the 

 base, which contains 4 7 veins. 



Dicranophyllum longifolium Renault. 



In this Commentry species 4 the leaves, which reach 14 cm. in 

 length, are characterised by the very small angle of the divergence 

 of the segments, 3 as contrasted with a divergence of 30 in 

 D. gallicum. The leaves are .almost erect and twice bifurcate. 



In addition to Dicranophyllum Beneckianum Sterzel has de- 

 scribed a second species, D. latifolium 5 , from the Lower Permian 

 of Baden characterised by leaves similar to those of D. striatum 

 but generally longer. The species is founded on leaves and is not 

 a well-defined type. 



Two species are recorded by Lesquereux 6 from the Coal Measures 



1 Schenk (83) A. p. 222, PL XLH. figs. 11, 12. 



2 Ibid. PL XLII. figs. 17, 18. 



3 Grand' Euiy (77) A. p. 275. Renault and Zoiller (88) A. PL LXXT. fig. 2. 

 1 Renault and Zeiller (88) A. p. 631, PL LXXI. fig. ]. 



Sterzel (07) p. 391, PL xv. figs. 911. 



Lesquereux (80) A. pp. 553, 554, Pis. LXXXITI., LXXXVII. 



72 



