114 Evans: TAXILEJEUNEA PTEROGONIA 
leaves and I-1.1xI-1.1 mm. for the underleaves, while the 
writer’s measurements are even lower. In many instances the 
stems are simple or very sparingly branched until the short sexual 
branches are formed, but long branches essentially like the stem 
are not infrequent and sometimes completely change the aspect 
of a plant. 
The earlier writers describe the leaves as semivertical or “‘sub- 
semivertical,” but Fics. 1-3 show that they spread at an angle of 
about 45 degrees and that Stephani is correct in describing them as 
“oblique patula.”” The same figures show the inconstancy of 
teeth in the apical region; many of the leaves are entire throughout, 
except for the very vague marginal crenulations (shown in Fic. 5), 
and none of the leaves figured show more than two teeth. In 
rare cases the writer has observed three teeth but never a higher 
number, although Spruce gives the number of teeth as about four. 
The basal auricle of the lobe, emphasized by both Spruce and 
Stephani, is clearly shown in Fic. 3. The published descriptions 
all insist that the lobule is exceedingly minute and rudimentary, 
and this is probably its usual appearance. Not infrequently, 
however, distinctly inflated lobules are present and conform to 
the type distinctive of the genus. Such lobules are shown in 
Fics. 1 and 2, while Fic. 6 shows the apical portion, with its short 
rounded tooth and proximal hyaline papilla. 
The leaf-cells deserve rather more attention than has previously 
been given them. Spruce describes them as ““leptodermes,”’ 
without mentioning the trigones, while Stephani states merely 
that the trigones are small. Fic. 4 shows that both trigones and 
intermediate thickenings are present and that they often show 
bulging sides. Sometimes the thickenings are less marked than 
in the cells figured, and the trigones may even show concave sides; 
but apparently distinct thickenings form a characteristic feature 
of the cells. Another feature, which earlier writers seem to have 
overlooked, is found in the dot-like verruculae scattered over the 
free walls of the cells. They are exceedingly minute, measuring 
less than a micromillimeter in diameter and can be made out only 
by careful observation. 
The underleaves exhibit in a marked degree the highly arched 
line of attachment which is characteristic of the more typical 
