148 THE JOURNAL OF BOTANY 
however, as from all our seni aon se it differs radically in 
the leaf apex, areolation, and peristo 
(B.) Fisstpens rurutus B. & §., forma. 
In endeavouring to solve the aie of the relation between 
the Glasnevin Fissidens and t . Orrit, I was anxious 
know whether by any fondly that plant might still be dis- 
coverable in its ancient locality, in and about the old quarry near 
Finglas Bridge. With this purpose Mr. McArdle and Mr. C. F. 
Allen (to whom I am indebted for the figures of P. exsul) made 
several excursions se the locality and carefully explored it, with- 
out finding any trace of f’. tequendamensis. In the course of their 
c 
hove ntly, if not eaialis. be su merge aid sb eg had been 
so for ag ‘preceding twelve months. This Mr. McArdle sent to 
me, and I at once recognized in it a a remarkable form or 
i Ss. 
The salient feature of F. rufulus is of course the stout 
cartilaginous border, often, as well as the nerve, coloured a de 
bright red, and entirely surrounding the leaf though often eroded 
away to some extent at the extreme apex. In the Finglas plant 
this border was frequently well Sethess 37 and then often ex- 
hibited the characteristic red colour; but more often 
sree from the same stem with others of the normal structure, it 
som 
traces of it; in (3) it is entirely wanting on the inferior lamina, 
and does not reach the apex of the superior; while in (4) it is 
it may occupy an intra 
elongated pellucid cells are not actually marginal, but occupy an 
inner position, with 1 to 2 rows of the ek small chlorophyllous 
cells between them and the margin (cf. fig. 5). This intra- 
inal border is a characteristic and normal Sore of certain 
exotic genera of mosses, and has been described in certain of the 
smaller man of Fissidens a Pe Sairalembatus Pith and 
nye the normal structure of F’. rufulus is so 
great that the iddiihity: of the plant might oe easily have been over- 
looked. I have hesitated as to giving it a varietal name, but the 
great variability of the leaves in respect to the border clearly 
