178 THE JOURNAL OF BUTANY 
rugose, when dry, and by the smallness of the apical pits ; and in 
all other respects the plant resembles F’. Borai. As this is a well- 
marked variety in its extreme form, I am distinguishing it as var. 
AMBIGUA. 
Having thus been led from the determination of F. muralis to 
discuss the most marked forms with which I am acquainted of 
F. Borei, it now remains to consider the affinities of the two types, 
neither of which can be expunged from our flora, as plants differing 
from Babington’s description of F’. muralis and answering precisely 
to that of Koch and Jordan are found in at least one British 
locality. So far as I can judge, all of the forms that have been 
dealt with in this paper under the name of F’. Borai, while varying 
greatly in habit and in flower, are clearly separable from I’. muralis 
by the fruit being always more or less obovate, with the apex dis- 
tinctly rounded. In the few examples that I have seen of Sonder’s 
plant there is a marked uniformity in the very small, subacute, 
subrotund-ovate fruits, which extends to the majority of the speci- 
Borei and I’. muralis are treated as separate species. The author, 
in so doing, relies not only on the difference in the fruit, but also 
on that of the pedicels, concerning which he writes under F’. Borat: 
‘Ferner durch die kurzen, dickeren, aufrecht-abstehenden Frucht- 
stielchen, die bei F’, muralis diner, linger und daher schlanker 
‘ ; 
of course, holds good in the case of the two types, but the mono- 
grapher’s remarks are almost identical with those of Clavaud con- 
cerning his variety, } muraliformis, of F'. Borei, and the same 
features may certainly be found in some of the British forms with 
Borai-like fruits. And as, moreover, among cultivated plants grown 
from the seed of stouter forms of I’. Borai, the same slender pedicels 
are prevalent, I cannot consider this means of distinction a very 
reliable one. The name of F’. muralis Sond. being anterior to 
I, Borgi Jord., and, so far as I am aware, to all other names free 
from ambiguity which might be applied to these plants, I take it to 
represent the aggregate species. 
