Fronds of Asplenium bulbiferum. 



149 



February 12 replaced in the upright position, making the frond therefore 

 horizontal. It was slowly rising, till on the 18th it had reached an angular 

 height of 45°. Eound that position it oscillated, gradually uncurling, till 



CO Co 'tf- 



Fig. 6. 



this was complete on March 2. Soon after, the sagging effect due to the 

 weight of the developing leaflets becomes apparent in the upper part of the 

 frond. It will be seen that epinasty is not well marked in this particular 

 case. As I read it, this record illustrates most of the movements described 

 above, except that due to light, which was shown in the diaheliotropism of 

 the leaflets not represented. 



3. The Statolith Apparatus of Asplenium bulbiferum. 



Most attention has been paid to the frond, though some stems have been 

 examined. Starch does not seem to be very abundant in the rhizome of this 

 plant, but was always found at the apex. In one case, in a stem which 

 seemed dormant, very little was present, and it was quite unoriented. 

 Statoliths are, however, always present beneath the rudiments of a 

 developing frond, though some diversity is shown in the cytology of the 

 statocyte. In one case the ground tissue was composed of cells with obvious 

 statoliths, but possessing in addition starch grains round the nucleus, which 

 latter was situated in the middle of the partial statocyte. In another case 

 the nuclei were seen among the statoliths, though probably only loosely 



VOL. XCIII. — B. M 



