1896, ] North American Species of Plagiochila, 193 
well described for the genus in general by Spruce.14 They 
are minute stems springing from the leaf-cells and bearing 
distant bifid leaves; in some cases they are very numerous 
and almost cover the surfaces of the leaves from which they 
spring. Similar propagula are sometimes found in P. Flori= 
dana and possibly in our other species. 
8. PLAGIOCHILA UNDATA Sull. Musci Alleg. m 222. 1845: 
Amer. Jour. Sci. and Arts II. 1: 73. 1846.—Plate XVI. figs. 
3-7 
Stems 2 to 3™ long, 0.2 to o.3™ in diameter; leaves 1.9™™ 
. 
in diamete 
Like the Preceding species, P. undata is usually sterile. I 
fave examined a single imperfect perianth from specimens 
collected by Professor Underwood at Toccoa Falls, Georgia, 
minatPPend a description of it and its bracts: perianth ter- 
minal, subtended by 2 innovations, 2™ long by 2™ wide, flat- 
=a ‘ampanulate, bilabiate with ciliate lips; bracts two, 
Le ong and 2.6™™ wide, broadly cuneate, antical margin re- 
Pi % denticulate, postical margin and apex irregularly den- 
e€. 
veloped trigones, in the middle of the leaf averaging 0.020™ 
r. 
The Mexican P, crispata is with some doubt referred to this 
meres. If Gottsche's figures are compared with those of P. 
: ala, it will be seen that, although at first sight they are 
Figo unlike, the differences are of degree, rather vee 
seats n P. crispata, the leaves are more strongly ae 
s ines along the postical margin than in our species. e 
ape of P. undata, however, which were collected 
as ‘ A. B. Langlois at Chinchuba, Louisiana, and distribute 
this ot ‘‘Hepatice Americane,” show both extremes i 
the ‘cdi and seem to break down the distinction sagen 
Bae? cles. Both P. Ludoviciana and P. undata a 
n ately. distributed in our Gulf states. oF 
erw sonclusion I would express my thanks to ages 4 
Ochi] is who has loaned me his vaiuable collection of Plagi 
haw P €arson, who has given me permission to use 
whe paving oP, Sullivantii; and to Professor Schumann, 
as al] 
pr : 
Yau. “d in the Botanical Museum at Berlin. 
a 4 University, 
‘4 
maz. et And. 452. 1885. 
