Botryopteris antiqua , Kidston. 1049 
when they both became free from the cortex. This is also shown in other 
preparations. 
That the angle between the two bundles was filled by a lamella is 
shown in Text-figs. I a and 1 b y which are camera drawings from sections 
showing the sheathing character well. In Fig. 14 the aphlebia trace is 
still unseparated from the stem stele {vide Fig. 14, px). We have in this 
series of sections an example of the aphlebia trace coming off (Slide 393. 
25, Text-fig. 1 a) at a considerable interval after the corresponding petiole 
trace (Slide 393. 28, Fig. 15). 
Another curious case is afforded by the series partly reproduced by 
Figs. 1-5. A badly developed diarch trace comes off just before the level 
of Fig. 1 (Slide 407. 14). A monarch trace comes off at the next node 
Text-fig. i a. A camera sketch from a 
stem node of which the previous section is shown 
in Fig. 14, PI. LXXXII. The Text-figure 
shows the aphlebia ( aph .) with its sheathing 
base, which is attached to the monarch petiole, p . 
The stem stele ( s.s .) is giving off various roots 
(r., r'). Slide 393. 25. x 19. 
Text-fig. i b. A camera sketch from a com¬ 
parable node at a slightly higher level, p ~ petiole, 
oph.t. = aphlebia trace, s — stem. From a slide 
kindly lent for the purpose of this figure by Dr. 
Gordon. C. N. # 1301. x 19. 
(vide Fig. 4 a, which is a photograph from Slide 407. 9). No evidence of an 
aphlebia appears with the latter until Slide 407. 7, where the petiole, now 
free from the cortex, shows a small branch coming off from its vascular 
bundle (vide Fig. 23). If one follows up this small branch through a series 
of sections of the petiole (Slides 407. 7-2), we find it flattens out and dis¬ 
appears, never entering an appendage of the petiole. We must, I think, 
regard this as a belated and abortive aphlebia trace. The phenomenon 
is very like the belated formation and abortion of the axillary strand in 
the leaf of Trichomanesjavanicum described by Miss Chambers. 1 In 
this species it was shown that the axillary strand, described by Boodle 2 as 
occurring in many of the Hymenophyllaceae, may defer its separation from 
the leaf-trace until the latter has entered a petiole. 
1 Chambers : in the present number of the Annals of Botany. 
2 Boodle: Anatomy of the Hymenophyllaceae. Annals of Botany, xiv, 1900, p. 455. 
