Mr. Brown on Lyellia, Leptostomum, and Buzbaumia. 588 
described than any other plant of the order, from the monographs 
of Linnæus and Schmidel to the excellent illustration recently 
published by Mr. Hooker, there is no difference of opinion on 
this point. I have lately ascertained, however, that Buzbaumia 
aphylla is always furnished with perfect leaves, which more nearly 
resemble, both in texture and division, those of a Jungermannia 
than of any species of moss properly so called; and consequently 
are widely different from those of Polytrichoïdeæ, to which this ge- 
nus is in several respects related. 
The leaves in the barren plant, where I first observed them, are 
lanceolate and but slightly divided. Those at the base of the fe- 
male perichetium are even broader than the former, but more 
deeply cut, both laterally and at top, into several capillary seg- 
ments; while the leaves which proceed from the surface of the 
pericheetium are still more deeply divided, and their segments 
so much elongated that the minute foliaceous base has been uni- 
versally overlooked, and the perichætium consequently described 
as covered with hairs. | là | 
* 
XXXVI. Ex- 
