146 THE JOURNAL OF BOTANY 
structure than a description can do; briefly it Dey. oe said that 
e lamelle reach, compared with the size of the ,a great 
ni oon and terminate, ais one, in a fringe of ailieaic ciliate 
© Citostunniely I have not been able to wae whether, or 
to what extent, this character is exhibited by F’. teque vendamensis. 
ortunately this can hardly be considered a safe 
deduction. The cristate internal lamelle are caetiaalarty difficult 
to observe ; in the d age the teeth are een _— and 
it is scarcely possi sible to dissect a peristome in this condition 
whilst in the moist ee id teeth bend evn and Séoble back 
~ upon themselves so strongly as to be almost entirely sunk within 
the orifice of ea ~~ ule, and can only be observed by careful 
dissection. Mor the elevated and cristate nature of the 
lamelle is = perceptible when the ventral surface of the tooth is 
examined directly; it only becomes so when the tooth is viewed 
laterally, 7. e. in profile, as figured on Plate 505. 
The possibility of this structure having been overlooked, while 
yet present in Ff. tequ oe even by so acute an observer as 
Lindberg, is supported in rather a remarkable way by the fact 
that it does occur, and yet lies been hitherto entirely overlooked 
in another and much better known species, F’. algarvicus Solms. 
I am indebted for this cbservation to Mr. W. E. Nicholson, whose 
attention I drew to the cristate lamelle in the Glasnevin species. 
ramifications are somewhat shorter and less deticatly ciliate, but 
essentially the structure is the same. 
from the presence or absence of this structure in 
F’, tequendamensis, at present undecided, ~_ relationship of these 
rine, plants (2. tequendamensis, F. algarvicus, and the Bieisevin 
plant now under siotine) is of a very curious and interesting nature. 
All three agree in having an acute, t eaf apex, and a lax 
and elongate basal areolation, characters which differentiate them 
from all the smaller European species of Fissidens; while at least 
two of them agree in possessing the very peculiar cristate lamellze 
of the peristome teeth. Whether or not this structure occurs in 
Fit mensis—and I am inclined to anticipate its presence— 
