placed, in different individuals, plane, o r v ery slightly concave, bifarious, horizo n ta l, o f
a n ovate figure ajiproaching to i-oiind, a t th e base semiamplexicaul and de cu rren t, a t
th e extrem ity va rying in a very rema rkable m a n n e r, whence th e species has m o st ju stly
been named, by th e a cu te Schrader, heterophylla. Scarcely two individuals a re fou n d to
correspond exactly, th ro u g h o u t all th e leaves, in th e figure o f this p a r t, th o u g h , in
g ene ra l (f. 2 ) , i t may be considered as b e in g , in those placed ne a re st to th e base o f th e
stem , acutely divided fo r ab o u t one fifth o f its len g th from th e apex in to two a cute
segments, which are divaricate in a slig h t d egre e ; while those o f tlie middle o f th e
surculus have i t obtusely em a rg in a te , with th e segments also obtuse , sometimes tru n c a te ,
w ith o u t any notch ; and, as th e leaves appi'oach th e extrem ity o f th e p lan t, they a re
q uite e n tire , rounded off, and frequently more ovate th a n th e re s t. In o th e r specimens,
however, th e leaves are sometimes all em a rg in a te (f. 4 ), o r, he re and the re , and w ith o u t
any k in d o f reg u la rity , in te rm ix ed w ith some th a t are entire , wh ilst othe rs a re acutely
c le ft; and 1 hav e la te ly received from M r. Lyell specimens, am o n g which w ere individuals
hav in g th e ir leaves so nearly en tire tliro u g h o u t, th a t, liad it n ot be en for th e calyx and
stipules, they might easily have been mistaken for a d is tin c t species. In all, th e color is
a pale g re en , v a rying, from situ a tio n , to a deeper h u e ; th e cellules la rg e and ovate.
Perigonial leaves, as tho.se o f J . bidentata, closely imbric a ted in two rows, a t th e base
ventricose, th e extrem ity somewhat revolute , em a rg in a te o r e n tire ; they a re found as
well u pon th e same p la n t with th e female fructification, as u pon different individuals,
an d often immediately below th e pericheetial leaves (f. f. 9. 10. l i ) :
These are s till more rema rkable for th e ir difference o f fo n n than th e cauline ones; in some
they a re a lto g e th e r e n tire ; in othe rs both bifid an d e n tir e ; whilst some again a re found
which have th e th ird p a ir from th e calyx ve iy obtusely em a rg in a te (f. 1 1 ) , w ith b lu n t
s egm en ts ; th e second pa ir deeply, b u t obtusely, em a rg in a te , w ith a cu te po in ts, and
the se slightly d en ta ted (f. 10) ; and th e first, o r calycine pa ir, varj in g w ith two o r th i ee
a cu te , ovate segments, o f different sizes, d istantly and unequally toothed (f, f. 9. 9);
these la s t a re generally e rect and appressed to th e lower p a r t o f th e calyx.
Stipules {f. f 7- S) one to each pair o f leaves, appressed to th e lower side o f th e stem,
oblong, bifid o r trifid, with th e segments more o r less diva ric a iing, a n d he re and th e re
toothed o r laciniated.
M a l e F r u c t if ic a t io n . Anthers s i t u a te d in sm a ll c lu s te r s , e x a c tly r e s em b lin g th o s e o f
J . bidentata.
F em a l e F r u c t if ic a t io n t e rm in a l u p o n th e e x t r em it y o f th e s u r c u l i a n d s h o r t b r a n c h e s , as
w e l l a s u p o n som e so s h o r t, t h a t , w ith o u t a c a r e f u l e x am in a t io n , th e y m ig h t be su p p o s e d t o b e
la te r a l.
Calyx (f. 12) scarcely th re e qua rte ra o f a line lo n g , ovate, with tlie sides \e iy obtusely
tria n g u la r, o r even ro u n d (supposing a transve rse section); th e m outh expanded, slit
some way down on one side, and much laciniated.
Calyptra ovate, th in , and delicate. I have ga th e red plant-s which had (p ro b ab ly in
consequence o f weakness in th e capsule or fo o ts ta lk ) c a rried u p th e c a ly p tra entire ,
w ith th e f iu it, as in th e mosses, and, tliough n o t in so perfect a s ta te , in Andrcea (f. 13)..
Capsule ovate, da rk b rown, dividing into four eqvial ovato-lanceolate valves, and discliarging
th e numerous
Seeds and spiral Jilaments, which a re o f a fulvous color.
J . heterophylla was well known to Dillenius, who ju s tly says o f i t in his description, “ Pimuilie
breviores e t obtusius miniisque p rofundb ac prececientis f J . bidentata) c t sequentis (J . hicuspidata)
speciei, incisas su n t" . Oth e r authors, however, have considered i t as only a variety o f J. bidentata..
I t differs from th a t p la n t in th e following pa rticula rs. Its mode o f growth, as fa r as 1 have been
able to discover, is always in small an d s tra g g lin g patches, even when grow in g unmixed with
mosses. Its fiuc tific a tio n is fa r more ab undant. It.s size is mucli less. T h e leaves, th o u g h so
variable in figure , are never,, th a t I am aware of, acute ly divided in to tw o equal and s tra it
segments. T h e stipules are less laciniated. T h e calyx sh o n e r in proportion to its width,
somewhat less ang u la r, and th e m o u th more open. Some o f th e leaves undoubtedly b e a r a
considerable affinity with those of J . bidentata $ , a n d i t is probable th a t Mr. Francis is correct in
his opinion, in supposing th is v a rie ty to belong to th e p re sent p lant. 1 have, nevertheless, been
tem pted to consider i t ra th e r as a va rying appearance o f th e former species, from th e circumstances
o f th e p la n t b e in g la rg e r even th a n th e a o f J. bidentata, o f th e leaves b e ing alway.s ema rgina te ,
an d o f th e stipules b e in g so much laciniated.
An exam in a tio n o f au th en tic specimens o f J . heterophylla, which Dr. S chrader communicated to
Mr. T u rn e r, leaves me no doubt as to th e id en tity o f o u r B ritish p la n t; and th a t a u th o r describes
th e same sta tions for i t in Germany as those in which it is found w ith u s ; “ ad truncos a rborum,
imprimis em ortua rum ubique fere, baud infrequens o c cu rrit" . T h e Hallerian synonym, quoted by
Leers an d Weis, I have more reason to th in k belongs to J . ventricosa (unde r which species I have
placed it) th a n to th e p r e s e n t; and I am inclined to th e same opinion w ith rega rd to th e Michelian
synonym o f th e la tte r w rite r.
RE FEREN CE S