2 LEJEUNEA, 
group (Acrolejewnea nob.), represented by many Oriental but few Ameri- 
can species, which has the rare character of the perianth being terminal 
on the stem, or on long branches, without any subfloral innovation. 
Another group (Brachiolejeunea nob.) has the terminal ? flower subtended 
by two opposite innovations, stretching almost horizontally, like a pair of 
arms, beneath the large pluriplicate perianth, and giving the stem (or 
branch) the figure of a crucifix. A few species attributed to Phragmi- 
coma belong more properly to Thysananthus, and others to Ptychanthus. 
The fifth genus, Omphalanthus, Lg. et N., I would limit to the “31, 
Amphigastriis indivisis” of the ‘Synopsis, which consists hitherto of but 
a single species, the Jung. filiformis of Swartz, of which J. geminiflora, 
Nees in Mart., Fl. Bras., is scarcely even a variety. It is perhaps the 
most widely distributed of any Lejewnea in the wooded mountains of 
tropical America, from the West Indies to Chili, but is absent from the 
Amazonian plain. Although it grows scatteredly, creeping over mosses 
and partly pensile, and is nowhere abundant, it 1s conspicuous from its 
long, brown, often nearly simple stems, its very large shield-like stipules, 
and its rather rigid, ovoid, eplicate perianths. A close ally of this 
species, although placed far apart from it (in Lejewnea) in the ‘Synopsis,’ 
is L. ovalis, Lg. et N., Peltolejewnea nob., which has the same slender ser- 
pentine stems, with very few short subopposite branches, the 9 flowers 1-3 
on a very short innovant ramulus, and broad scutate underleaves, so de- 
current or cut out at their insertion that the actual base is a parabolic or 
semielliptic line on the stem; but it differs essentially in the acutely 
5-gonal long-beaked perianths, those of O. filiformis being very obscurely 
trigonous when young but terete at maturity, with a depressed apex. 
The species placed in “3 2, Amphiqustris bifidis” have only a remote 
affinity with the first. The underleaves, although sometimes nearly 
equalling the leaves, are bifid at the apex—in only two species, by rare 
exception, entire—and, instead of being decurrent at the base for half 
their length, are usually cordate, with free auricles. The very small, 
tender perianths are not altogether eplicate (as at first described in the 
‘ Synopsis’), and, in the young stage at least, are distinctly 5-gonal at the 
apex. The authors, indeed, found themselves obliged ultimately to admit 
species with very distinctly angular perianths, eg., O. pterogonius, O. 
lusorius, &c., and to modify the generic character thus: “ perianthium 
apice obtuse subplicatum vel quinquangulum.” * The character thus 
extended would comprise (besides the so-called Omphalantht) nearly all 
typical Lejewnee with bifid stipules, including our own L. serpyllifolia. 
The true affinity of the species. of this second section, with minute, 
closely-set flowers on a wniparous cyme, and usually acuminate leaves, 
is with many of the Lejewner, 3 Acutifoliw of the ‘Synopsis, with which, 
therefore, I have combined them to form the subgenus Tacilejewnea. 
The five genera thus separated from Lejewnea comprise scarcely more 
than one-sixth of the monogynous Jubulew described in the ‘Synopsis,’ 
the whole remainder being consigned to Lejewnea, and divided into a 
number of sections and subsections, a few of which are natural groups, 
although in most there is a good deal of dislocation, nor do the species 
always correspond to the sectional character under which they are 
arranged. Thus, under “ 2 1, Phragmicomoidee, Perianthium a tergo 
compressum, Ventre convexo, &c.,” is placed No. 1; L. transversalis (Sw.) 
« «Syn, Hep.,’ Appendix, p. 746, 
