248 BOTANICAL GAZETTE [aren 
ous on the lower surface; no hairs or glands were observed 
on either face. The chlorophyll-bearing tissue is differen 
tiated into a palisade tissue of about two layers on the ventral 
face of the blade, and an ordinary pneumatic tissue, the cells of 
which are roundish and loosely connected with each other, lea ] 
ing intercellular spaces of quite considerable width. The 
mestome bundles possess all the elements as found in other 
dicotyledons, and are supported by a collenchymatic tissw 
which makes the nerves very prominent on the lower surfaced 
the leaf. 4 
Besides these completely developed leaves, our plant pos — 
sesses also scale-like ones, which are much more numerous 
covering not only the underground shoots, but also the base of 
the inflorescences (7' and 7? in fig. 7). Very characteristic of 
Pyrola aphylla is the profuse development of axillary buds, which 
are readily observed upon the underground stems and at the 
base of the aerial floral and vegetative shoots. These axilla _ 
buds, however, are restricted to the scale-like leaves, since | 
failed to detect any such in the axils of those provided wit 
petiole and blade. The first two leaves of such axillary bués 
are situated to the right and left of the diminutive bud as 4 
while the third and fourth appear almost in regular alternatio® 4 
with these, those following, on the contrary, forming an ; 
Nary spiral, oe 
Upon examining the stem underground we Oe ae 
figure (jig. 7) two long branches (4* and 6”) with ee 
internodes, which show an ascending curvature from paper 
from which point they creep horizontally underneath : ey 
of the soil, until they finally push up through it, . rope 
nated at once by the inflorescence or first by @ die : 
leaves. It is easily understood that it has been the co" 
just such underground branches, terminated by inflo é 
not preceded by a rosette of leaves, which has misl atomic! 
to consider our plant as aphyllous and parasitic. | se rate 
Structure of these underground branches, which co autophyt™ 
thizome of Pyrola aphylla, is, however, that of aie 
rescences am 
