BOTRYOPTERIS 327 



marked ; its position in the stem will be considered in 

 connection with that in the petiole. 



In the British species a § phyllotaxis appears to 

 have prevailed. The petiolar bundle is often actually 

 larger than the stele of the stem, and contains larger 



P*IG. 121. — Botryopteris hirsute (Will.). Transverse section of stem at its junction 

 with the petiole ; X.S., xylem of stem ; Jc.p., xylem of petiole ; rl, r-, diarch roots, 

 springing from the stem ; h, hairs. X about 15. (G. T. G.) S. Coll. 569. 



tracheides (see Fig. 121J. Its form, as seen in trans- 

 verse section, is very characteristic. The elliptical 

 band of xylem has three prominent points, all projecting 

 on the same side, and directed towards the upper and 

 inner face of the petiole. Hence the specific name 

 tridentata, given to this petiole by Felix, before its 



