XLIV] CUPRESSINOXYLON 201 



Cupressinoxylon (Taxodioxylon) Taxodii Gothan. 



In his description of the Tertiary beds at Senftenberg Potonie 1 

 identified some of the wood as Taxodium and compared the de- 

 posits with those of a Taxodium- swamp. Gothan 2 has given a 

 fuller description of the wood, which is characterised by xylem- 

 parenchyma with thick transverse walls (fig. 720, B) and fairly 

 large elliptical pits in the field ; in the region of the spring- wood 

 the medullary-ray pits have a horizontal pore and in the late wood 

 the pore is said to be vertical. The bordered pits on the vertical 

 walls of the xylem-parenchyma have a vertical pore in the summer- 

 wood but it is horizontal in the spring- wood. 



Cupressinoxylon (Taxodioxylon) Sequoianum Mercklin. 



Gothan 3 recognised this species, originally described by Mercklin 4 

 from an unknown locality, in Tertiary beds in Germany associated 

 with foliage-shoots agreeing with Sequoia sempervirens. The walls 

 of the xylem-parenchyma are thinner than in C. Taxodii; there 

 are 2 7 apparently simple pits in the field (fig. 720, C) in one or 

 two horizontal rows. There may be three rows of opposite pits on 

 the radial walls of the tracheids. It may be that C. Sequoianum is 

 the wood of a Sequoia. A closely allied species is represented by 

 Cupressinoxylon uniradiatum Goepp. 5 from Briihl afterwards 

 recorded by Conwentz 6 as Rhizocupressinoxylon from Tertiary beds 

 in Silesia. Schmalhausen 7 has described some interesting speci- 

 mens of wood from Tertiary beds in Kussia as Cupressinoxylon 

 Sequoianum characterised by the possession of elliptical simple 

 pits in the ray cells (from 2 to 6 in the field) of the transversely 

 elongated form characteristic of Taxodioxylon. Xylem-paren- 

 chyma is fairly abundant and the tracheids are peculiar in 

 having three or rarely four bordered pits on the walls as in some 

 recent Pines. 



Another example of wood of the Taxodioxylon type is afforded 

 by T. palustre described by Felix 8 from Tertiary rocks in Hungary 

 and recorded also from sub-Oligocene beds in Silesia. Gothan 9 



1 Potonie (96); see also Eberdt (94). 2 Gothan (06) p. 164. 



3 Ibid. p. 165; (09) p. 518. 4 Mercklin (55) p. 65, PL xvn. 



5 Goeppert (50) p. 203, PL xxvn. 6 Conwentz (80) A. p. 25, Pis. iv., v. 



7 Schmalhausen (83) PL xn. 8 Felix (82) p. 278; (84) p. 38 



9 Gothan (10) pp. 40, 43, PL VTI. 



