148 Johnson . — On Arceuthobium Oxycedri . 
the papilla does not help one to decide its whole nature, it 
does prove that it is a modified part of the floral axis and not 
a body derived from the fusion of the c claws 5 of the two 
carpels. The definiteness of position of the two embryo-sacs 
in A. Oxycedri should be taken into account. After cutting 
longitudinally a number of pollinated flowers without getting 
satisfactory views of the embryo-sacs except as it seemed 
accidentally, I found by making longitudinal sections through 
the median plane of the two perianth-segments that I almost in- 
variably got complete sections of the two embryo-sacs. I also 
made successive transverse sections of the flower, beginning in 
some cases at the apex of the style, in others at the base of 
the flower. I had noticed that the apex of the style was 
grooved, that the stigma was bilobed, and that the lobes were 
elongated parallel to the upper (ventral) faces of the perianth 
segments. The sections showed — 
1. That the style was traversed by a canal formed by the 
unapplied parts of the ventral faces of the carpels. 
2 . That this stylar canal was, as seen in transverse section, 
elongated parallel to the ventral faces of the carpel (Fig. 7). 
3. That there were two embryo-sacs opposite the median 
planes of the two carpels (Fig. 6). 
4. That the carpels had no vascular bundles. 
5. That the carpels were opposite the two segments of the 
perianth (Fig. 7). 
It was not without much hesitation that I allowed myself 
to be convinced that the carpels are evascular and opposite the 
perianth-segments, for by Eichler 1 and Baillon 2 they are placed 
at right angles to the lobes of the perianth (compare Figs. 1, 
6 and 7 with Fig. 236 in Bluthendiagramme). It should be stated 
that in a few cases isolated irregularly distributed (reticulate), 
isodiametric tracheides were found in the carpels. Taking all 
the different circumstances into account, I prefer, so far as I 
may express an opinion, to follow the direction of Treub’s view 
of Loranthus sphaerocarpus , and to call the ovarian papilla in 
1 Eichler, Bluthendiagramme, p. 553. 
2 Baillon, op. cit on p. 142, Plate VI. 
