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.JUNGERMANNIA RHIZOBOLA.
Jungermannia stipitata, frondibus oblongis dicbotomis
nervosis, marginatis denticulatis, apice longissime attenuata
radicante. (T a b . LXXXVII.)
J. rbizobola. Schwaegr. Muse. Hep. Prodr. p. 31.
H a b . Ill iiisuja Borb o n iæ. D . du Petit Thouars,
Stipes semiunc ia lis, filiformis, subcompressus, flavescens. Frons
o v a to -o b lo n g a , m em b ran a c e a , p u lch e rrim e r e tic u la ta , p allide
virescens, p ellucida, ra riu s simplex p lerumque d ichotome
divisa, u n d u la ta , m a rg in e in c ra s s a ta , d e n ta to - s e r ra ta , d e n tic u lis
d istan tib u s , o b tu sa , vel ple rum q u e in ap ic em filiformem r a -
d ic an tem s tip iti omn in o simillimam sed m u lto longiorem a t t e n
u a ta , nervo sa tis a n g u s to , viridi p e rcu rsa .
This remarkable plant, of which the specimens so liberally communicated
to me by its discoverer, possess, I regret to say, no
fructification, will rank, so far as can be ascertained by habit, with
J . Lyellii, J . hilernica, J . Jiahellata, and J . Hymenophyllum ;
differing from all, however, in the thicker margins of the fronds,
and especially in the curiously lengthened extremitiesof the apices,
which strike root into the ground, and are scarcely to be distinguished
from the stipes but by their greater length.
M. du Petit Thouars had given to this plant the specific name
of J . radicans; but besides that this appellation had been already
given by some authors to J . trilolata of Linna;us, Schwaegrichen
seems dearly already to have described this species in his Muse.
Hepat. Prodrom/US, applying to it there the name rhixohola,
though without mentioning by whom it was discovered.
Fig, 1, plants, nat. size. Fig. 2, single plant.—mag«.
Al