PINUS. REPRODUCTIVE ORGANS. .157 



(&.) Larger green succulent cones, which occur 

 laterally at the apical part of the shoot of the previous 

 year: the arrangement of parts on these corresponds 

 to that on (a). 



(c.) Cones larger than (&), brown and with lignified 

 tissues : on these the scales are usually more or less 

 separated from one another so as to disclose the seeds, 

 two of which are borne at the base of each of the 

 ovuliferous scales. These ripe cones are seated laterally 

 near the apex of the two-years-old shoot, 



A. Cut median longitudinal sections of a cone corre- 

 sponding to stage (a). It should previously have been 

 hardened with alcohol for some days : mount in 

 glycerine, and examine with a low power. Observe 



1. The central axis, not differing essentially from the 

 young vegetative axis : on this are borne scales of two 

 orders easily distinguished by their size. 



2. The smaller of these are the leaves borne by the 

 axis of the cone, and the morphological equivalents 

 of the brown scale-leaves which cover the winter buds. 

 In the axil of each of these is borne one of 



3. The larger or Ovuliferous scales, which are 

 longer and more bulky than (H) : they alone can be 

 seen externally. On the upper surface of each of these, 

 close to the axis, are borne 



4. Two Ovules, or Macrosporangia, which are 

 anatropous, so that the micropyle is directed towards 

 the base of the scale : if cut in a median plane, each 

 ovule will be seen to consist of 



i. One Integument, several layers of cells thick, 

 with a widely open Micropyle facing the axis ; this 

 is 



