Musctr ExorTtict.—Swartziani. 
JUNGERMANNIA SERRULATA. 
Jungermannia caule erecto dichotomo, foliis distichis 
v. secundis subrotundis subconduplicatis spinuloso- 
dentatis apice emarginatis, stipulis magnis rotundatis 
conyexis spinuloso-dentatis apice emarginatis, calyce 
cylindraceo ore dentato. (Tas. LXX XVIII.) 
J. serrulata. Swartz F1. Ind. Occ.p. 1854. Schwaegr. 
List. Muse. Hep. Prodr. p. 19. 7 
J. Aubertii. Schwaegr. Hist. Musc. Hep. Prodr.p.¥9. 
Haz. In subhumidis umbrosis montium altissimorum Jamaicze: 
Swartz. In Insula Francie. D. Aubert du Petit Thouars. 
Caulis bipollicaris, erectus, flexuosus, dichotome ramosus. Folia 
bifariam inserta, horizontalia, disticha, raro secunda, flavo- 
lutescentia, horizontalia, coneava, atque lateribus incurvis ut 
fere conduplicata, subrotunda, subundulatis, marginibus spi- 
nuloso-dentatis, dentibus distantibus inequalibus, apice emar- 
ginatis; substantia compacta, reticuli areolis minutis ro- 
tundatis, Stipule foliis duplo minores, rotundate, convexe,, 
spinoso-dentate,apice emarginate. Perichetialia reliquis si- 
milia, sed marginibus ciliato-spinosis. Calyx terminalis ob- 
longus, cylindraceus, apice parum plicatus, ore lacerato, iaci- 
niis dentieulatis, 
4 
Schwaegrichen has described the leaves of this Jungermannia 
-a8 quadrifid, though in my specimens they are usually emargi- 
nate; but it often happens that near the apices of the segments. 
there arise tooth-like processes so large that the extremity may 
be considered tri- or quadrifid, or more properly, perhaps, tri- 
or quadri-dentate, Of J. Aubertii Schwaegr, I havereceived spe- 
cimens from Du Petit Thouars himself, and have no hesitation 
mM saying it is the same as Swartz’s J. serrulata, having the leaves, 
however, somewhat less toothed. 
Fig. }, 3, plants, nal. size. Fig, 2, portion of a stem and 
leaves, superior side. Fig. 3,° ditto, inferior side, F ig. 4, 5, 
leaves, Fig. 6, stipule, F ig. 7. perichetial leaf, Fig, 8, ca- 
lyx.—magn 
