Tlie perichætial leaves (f. 7 ) a re trilid o r quadrifid, th e segments more equal in size
th a n those o f tlie cauline leaves, and m ore fi-equently and reg u la rly denticulate.
.Male F r u c t if ic a t io n 1 h a v e n e v e r se en .
F em a l e F r u c t if ic a t io n te rm in a l u p o n th e s tem s .
Calyx (f. 8) oboi a te , a b o u t ha lf a line lo n g , and plic a te : towa rds th e extrem ity th e
m outh is contra c ted, small and too th ed o r lacerated. In color and texture i t exactly
resembles th e leaves.
Calyptra oboi-ate, u-hitish, re ticu la ted , te rm in a te d by a sh o rt tu b u la r style.
Peduncle s c a r c e ly m e a s u r in g tw ic e th e le n g th o f th e c a ly x , w h i te a n d c e llu lo s e .
Capsule, seeds, and spiral filaments exactly as in J . excisa.
O b s . Upon th e te rm in a l leai-es o f th is Ju n g e rm a n n ia , towards th e la tte r e n d o f December,
a re s itu a ted Geiniitoe (f. f. 10. 11- 12. 13), collected to g e th e r in a small, pale, yeUowish-green,
spherical m a s s ; .b u t in th e middle o f J an u a ry th ey are, for the, most p a r t, dispersed a b o u t,
th e plant- in th e form o f a m in u te powder. E a ch pa rtic le is s em i-tran sp a ren t, a n d u n d e r a
microscope appears som e u h a t spherical in its o utline , b u t b e se t w ith a n um b e r o f acute ,
proje c tin g angles (f. 13).
Hallci- is th e fii-st a u th o r who seems to have noticed th is species, to which th e name o f
incisa was applied by Sclu-ader in his Systematische Sammlung Kryptogamischer Gewächse in
th e ye a r 1796. In th e B ritish dominions i t ha s for many years be en k n own to Mr. Francis
as a n in h a b ita n t o f h e a th y places in th e ne ighborhood o f H o l t ; a n d th is g en tlem an has lo n g
preserved am ong his manuscriiits a figure a n d desc ription o f it , u n d e r th e appe lla tion of
J . depressa. Subsequent to its discovery h y Mr. Francis i t has be en asc e rta ined to be also a na tive
o f Ire land and Yorkshire, and d u rin g th e la st summe r, 1811, wh en th e en g rav in g o f th e p la te
was completed, rip e capsules wei-e b ro u g h t to me hy Mr. Dickson, which h e h ad be en fo rtu n a te
enough to fin d -n e a r Croydon, in Surrey. Jungermannia excisa, as has be en already rem a rk ed ,
bears th e g re a te s t affinity w ith th e p re s e n t p la n t, b u t th e u n d u la ted a n d almost unij-ersally
trid e n ta te leaves, to g e th e r w ith th e compressed stem , a re circumstanc e s wh ich wiU readily
dis tinguish J . incisa ft-om th a t, as well as from , every o th e r species o f th e genus.
Dr. R o th 's description o f J . incisa accords so well w ith o u r B ritish p la n t th a t 1 f e d no
he sita tio n in ado p tin g his sy n o n ym ; b u t he appears to have fallen in to a s tra n g e mistake,
when he says, “ Hiiic ( J . in c isa ) proximh accedit, nisi eadcm s it, ‘ Jungermannia Mcrenata
fronde simplic itbr p in n a tä , foliolis b id e n ta tis ; floralibus p lic a tis.’ S c h m id e l , Icon, et Jn a ly s.
tab. 64. f . 1. H ab itu s to tiu s plantaj sanh idem cum nosti'ä, quamvis folia co n s tan te r bisecta
d ic an tu r, q u « in nostrae regionis plan tis nu n c b i n u n c e t p le rumque trifida o b s e rv a n tu r ! ”
In an o th e r place th e same a u th o r expresses a d o u b t w h e th e r J . incisa be really d is tin c t from
his J.-globulifera, a species, whieli, as has be en observed elsewhere, appears to- me to include
J . e x c isa ,-J i ventricosa, an d J . exsecta.
R E F E R E N C E S T O T H E P L A T E .
Female p la n t o f J . excisa, natural size.
Var. /3. natural size.
Female p la n t, magnified .................................................................................................... 6
Portion o f the stem and leaves ...................................................................................... 4
L e a f ........................................................................................................................................... 2
Perichætial le a f ............ 4
Longitudinal section o f the calyx ................................................................................... 4
Receptacle, with the germen and barren p istilla ..................................................... 3
jBarrere pistillum .................................................................................... i
Calyptra .................................................................................................................................. 2
Var. /3........................................................................................................................................... 6
L e a f o f var. /3.......................................................................................................................... 2