Muscr Exoric3.—Swariziani. 
JUNGERMANNIA SERRULATA. 
Jungermannia caule erecto dichotomo, foliis distichis 
v. secundis subrotundis subconduplicatis spinuloso- 
dentatis apice emarginatis, stipulis magnis rotundatis 
convexis spinuloso-dentatis apice emarginatis, calyce 
cylindraceo ore dentato. (Tas. LX XXVIIL.) 
J. serrulata. Swartz Fl. Ind. Occ.p. 1854. Schwaegr. 
Hist. Muse. Hep. Prodr. p.\9. 
J. Aubertii. Schwaegr. Hist. Musc. Hep. Prodr.p.\9. 
Has. Insubhumidis umbrosis montium altissimorum Jamaice. 
Swartz. In Insula Francie. D. Aubert du Petit Thouars. 
Caulis bipollicaris, erectus, flexuosus, dichotome ramosus. Folia 
bifariam inserta, horizontalia, disticha, raro secunda, flavo- 
futescentia, horizontalia, concava, 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, convex, 
spinoso-dentate,apice emarginate. Perichetialia reliquis si- 
milia, sed marginibus ciliato-spinosis. Calyx terminalis ob- 
longus, cylindraceus, apice parum plicatus, ore lacerato, laci- 
niis denticulatis. 
__ Schwaegrichen has described the leaves of this Jungermannia 
as quadrifid, though in my specimens thev 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 
in saying it is the same as Swartz’s J. servilata, having the leaves, 
however, somewhat less toothed. 
Fig. 1, 1, plants, nat. size. Fig, 2, portion of a stem and 
leaves, superior side. Fig. 3, ditto, ‘telieine side. Fig. 4, 5, 
leaves. Fig. 6, stipule. Fig. 7. perichetial leaf. Fig. 8, ca- 
lyx.—magn, 
