354 ERNEST WAIJREN. 



appear to usually possess no pits, but in one or two cases 

 there were indicatious of simple pits being present between 

 the cells themselves, and also between tliem and the medullary 

 cells. 



Outside this tissue there is the ordinary traeheide tissue 

 with bordered pits, and with simple pits communicating Avith 

 the medullary cells. 



Average width of annual rings about 3-.5 mm. 



Tracheides squai^e in cross-section, average tangential_ 

 width 0'032 mm. Length variable; many of them appear to 

 be short and about 0"75 mm. in length. Pits on the radial walls. 

 These pits are more circular in outline and less closely packed 

 than in the other specimens. In the majority of the 

 tracheides they are uniseriate or biseriate, but frecpiently 

 they are not in contact with one another, and even when in 

 contact they are not closely packed, and the pits consequently 

 exhil)it no Hattening. When biseriate the pits are generally 

 arranged opposite to one another in pairs (textfig. 1, B). 

 In the spi'ing-wood with wider tracheides there may be 

 three rows of pits fairly closely packed. 



Medullary rays are numerous, there being an average of 

 about seven rays to every millimetre of tangential length : 

 one cell thick, average number of cells in height about seven. 

 Radial length of medullary cells about O'llo mm., tangential 

 width, 0'Ul9 mm. The medullary cells connnunicate with the 

 tracheides by 2-5 small oblique or horizontal pits, liesin was 

 api)arently jn-esent in many of tlie medullary cells. 



From the description it will be seen that there is no striking 

 distinction between this wood and that of the other siiecimens. 

 The more rounded outline and the generally less crowded 

 condition of the bordered pits are the only tangible diffe- 

 rences. A general examination of all the sections shows 

 that the arrangement of the pits is a very variable character, 

 and although in this specimen they are distinctl_y more 

 scattered than usual, yet it does not apjDear to be a sufficiently 

 definite character for founding a new species. Possiljl\- the 

 tracheides of young stems tend to have the pits more loosely 



