Evans: TAXILEJEUNEA PTEROGONIA 115 
species of Taxilejeunea. This is brought out in Fics. 1 and 2, 
which likewise show the striking basal auricles. In most cases 
these are so large that they closely approach each other or even 
overlap. The single auricle shown in FIG. 8 indicates the vaguely 
crenulate margin found in the underleaves as well as in the leaves. 
The apical incisions, as shown in the figures, are sometimes a little 
deeper than the published descriptions imply, while the lobes are 
subacute or even subobtuse rather than invariably acute, but these 
discrepancies are slight and of but little significance. 
The branch-system upon which the female inflorescences are 
borne is less complex and subject to less variability than in many 
other species. In the majority of cases (see Fic. 1) the branch 
bears one or two small underleaves, with their corresponding 
leaves, and then proceeds at once to form an archegonium with 
its involucral leaves; from the base of the inner bract a subfloral 
innovation arises and bears a second female inflorescence after 
producing a single small underleaf and a single leaf. The inno- 
vation arising from this second flower is usually sterile and may 
be very short; sometimes, however, it gives rise to a third inflores- 
cence which in turn gives rise to a sterile innovation. The writer 
has observed no instance in which more than three inflorescences. 
of successive orders were present on a branch-system, although it. 
would not be surprising if more were occasionally developed. 
When perianths are present, the system presents the appearance 
of a short branch with two or three closely approximated perianths 
along its upper side. Deviatons from this condition are of occa- 
sional occurence; sometimes, for example, the original branch 
bears several to many leaves before its growth is brought to am 
end by the development of an archegonium; sometimes (see: 
Fic. 2) an innovation will bear two (rarely three) underleaves. 
and three (rarely five) leaves (instead of one of each); sometimes. 
the first inflorescence gives rise to two innovations, each of which 
is tipped with an archegonium; sometimes a subfloral innovation 
develops as a male spike. These deviations are not infrequent 
and probably others could be detected by careful search, and yet 
the type first described occurs so often that it may be regarded as 
distinctive of the species. 
The bracts and bracteoles represented (Fics. g-18) show a 
