Muscr ExorTici.—WMenviesiani. 
JUNGERMANNIA HORIZONTALIS. 
Jungermannia caule elongato (repente ?) subramoso, 
foliis distichis horizontalibus ovato-quadratis decur- 
rentibus, basi superiore dilatata, stipulis minutis sublu- 
nulatis, calyce laterali ex inferiore parte caulis oblon- 
go-ovato, ore laciniato. (Tas. XCVI.) 
Has. Apud Staten Land, America meridionali. D. Menzies, 
1787. 
Caules bi-tripollicares, (repentes ?) simplices vel per innovationes 
divisi, fusco-nigricantes.. Folia bifaria, exacte disticha, hori- 
zontaliter patula, arcte imbricata, intense fusca vel rarius fusco- 
viridia, ovato-quadrata, basi inferiore vel anteriore decurrentia, 
superiore vel posteriore dilatata, omnino integerrima, reticu- 
lata, areolis parvis, rotundatis. Perichetialia minuta, sub- 
erecta, concava, superiora emarginata. Stipule valde minute, 
sublunulate. Calyx inramulis propriis brevissimis, ex parte 
inferiore caulis egrediens, lateralis, oblongo-ovatus, ore sub- 
contracto, brevi-laciniato, laciniis denticulatis. 
fC  —— 
J. horizontalis may be immediately seen to be very nearly in- 
deed allied to a well known British species, JJ. polyanthos, hav- 
ing precisely a similar habit, leaves very nearly the same, and 
what is more remarkable still, its fructification on short horizon- 
tal branches arising from the under part of the stem. There is, 
however, a very striking difference in the stipules, in the dilated 
posterior base of the present plant, and also in the colour ; this 
being, in most of the specimens that Mr. Menzies has gathered, 
of arich brown. I have seen no individuals possessing perfect 
fruit ; so that whether or not the corolla be exserted beyond the 
calyx, as in J. polyanthos, I am unable to say. 
Fig. 1,1, sterile plants, and Fig. 2, fertile plant, nat. size. 
Fig. 3, portion of a plant, superior side. Fig. 4, underside of a 
portion of the fertile plant. Fig. 5, leaf. Fig. 6, stipule. 
Fig. 7, calyx and perichatial leaves. —magn. 
