:,*i 



THOMSONS AXEGOTHAEA AND MICROCACHRYS 347 



(ft. i/). Fig. 12 is a transverse section of the sporophyll a little 

 earer the cone axis than the point indicated. It shows a single 



... . . : „;„ A^ri Thp 



vascular 



wood (li b — -, o . 



center are two very darkly nucleate cells. These mark the separation 

 of the wood of the ovular supply from that of the main bundle. The 

 bast above this is but slightly differentiated, and nearer to the axis of 



or resin duct. The 

 n outline. Near its 



auw>^ Lino 10 i^uit ^ 11 5 llt V *****>■»>"*■ -**— ■ - — - — - . # 



... cone dies out completely, as does the wood itself in its further 

 course through the cortex. Under the base of the ovule the bast is 

 quite apparent on the upper side of the supply bundle (fig. n), which 

 lows a tendency to bifurcate, the branches passing laterally into the 

 base of the integument. Beyond the separation of the ovular supply, 



the 



the 



It 



elements, the more central ones of which are elongated, the lateral 



quite typical transfusion tissue. 

 In material of Saxegothaea some six months older than the former, 

 e vascular system of the megasporophyll is further developed 

 has been recently described by Miss Stiles,* with whose accoum u., 

 own observations are practically in accord. The upper vascular sys- 

 tem mav be composed, in the region of the ovule, of as many as our 

 brands. These, however, in all the material I exammed ' T Un, ;f '" 

 two before passing upward into the base of the ovule. Mis * bT . 

 speaks of there being about three bundles in this region. I e p 

 terminates at the level of the base of the nucellus in a c ° ns,dera 

 Mansion of transfusion-like tissue. The mam bundle o 

 s Porophyll is replaced by a series somewhat similar in e ^ 

 re 8ion in which the proliferation of the ovular set occurs. ^ 



ov ule a single bundle is found, with centripetal, and on its 

 coiKirWKi: ^__,._ _r „.,_ j^pnts. The vascular supply 



— «>ucraDie, development ot xyiem eicmcu». - „ rtr maUv 



* *e sca,e cones L» the axis is a ^J"*££2 

 tented wood and bast. In the cortex gradually new x> i ^ 



a * formed opposite the protoxylem. Farther out wooc i _ ^ 

 coming of! the sides of the main bundle supplement the org ^ ^ 

 ^ elements, which up to this point appear not to have y ^ 

 ^ own. In the further course the proliferation of the w 



_. ti xTotvPhvtol. 7:209- 



3 Stiles, W., The anatomv of Saxe 



222 - 1908, 



