02 



MORPnOI.OGY OF SPERMATOPIIYTES 



invested by a very distinct bundle sheath, in which two vascuhar 

 bundles of the ordinary collateral type are developed. The re- 



Fio. 4ri. — r.]-;inr'li tVoni r'^lcrurnt/s PiirJit-a/m. — Kroiii i»liorouT;i;ih of liorliarium spooi- 

 iiit'li, twxi thiixls natural si/.u. 



niaining tissue within the sheath is orjianizod as " transfusion 

 tissue," consisting of two hinds of parenchymatous cells, (1) 

 those without protoplasm and pitted, and (2) those with ]u-oto- 



