ANDERSON: EMBRYOGENY OF MARTYNIA LOUISIANA 145 
protuberances similar to those of the lobes of the calyx, but 
earlier than the calyx lobes. The bracteoles develop inferior 
to the calyx, opposite each other and at right angles to the 
bract (Fic. 10, b, B). Since Fic. 9 is a median section through 
the flower, only the edge of each bracteole is shown. At this 
stage, they are large enough to cover the young flower. 
Fics. 8 and 9 show the further development of the parts 
of the flower. The calyx (S) is large enough to cover the other 
floral parts. An almost median section of two lateral lobes (P) 
of the corolla is shown in Fic. 9, while a cross section of the tip 
of the lower lobe is shown at P! in Fic. 8. The lower lobe of 
of the corolla is the largest and in 
the bud is covered by the others. 
The manner in which the corolla lobes 
overlap is shown in Fic. 
median section through two of the 
stamens (FIG. 8, A) of the same flower 
shows the further development of J5 
the stamens seen at A, Fic..7._ Asin 
most cases, the development of the 
anther precedes that of the filament 
(Fic. 8, A). However, at this time 
the tissue of the anther is undifferen- Fic. 14. Tees stamen. 
tiated. At the time the pollen A, aborted stam 
mother-cells are formed the filament oe or Matare ie 
is still shorter than the anther. The ee Seiwa sige a 
filaments remain short (Fic. 14) until — Fy¢. 16. Mature pistil and 
almost the time of anthesis, when they stamensin position. _H, stigma 
elongate rapidly, bringing the anthers lobes. 
into the throat of the corolla, just below the lips of the stigma 
(F.1G 16). The stamens are didynamous, the posterior pair 
being the longer. Just before anthesis, the lobes of the anther 
diverge, forming a straight line transverse to the filament. At 
the same time, the filaments of the corresponding pairs of 
stamens converge in such a way as to bring the diverging 
anthers into contact (Fic. 16) along the line of their linear 
dehiscence. At time of shedding, the rather large pollen grains 
are characterized by an exine that is thickened in the form 
of hexagonal areas. 
As was stated previously, the pistil appears as a rather broad 
protuberance (FIG. 5, O), but soon a depression is formed in 
the center (Fic. 9, O). The primordium of the pistil continues 
