576 Mr. Brown on Lyellia, Teptostomum, and Buxbaumia. 
of Good Hope, has the spherical striated capsule as well as the 
inflorescence and ramification of Bartramia : and with this genus 
also Anictangium Humboldtii agrees in its capsule, though its habit 
is that of Leskia or Hypnum. 
Drepanophyllum of Richard (Dicranum? falcifolium of Hooker,) 
in form and disposition of leaves is related to Fissidens and Neckera. 
Calymperes approaches to Orthotrichum, or rather, perhaps, to 
Schlotheimia or Macromitrium. 
Lyellia, which belongs to the same division of the artificial 
system, is evidently allied to Dawsonia and Polytrichum. 
And lastly, Leptostomum, the genus more particularly under 
consideration, appears to me most nearly related to Bryum ; with 
which indeed its affinity would be completely established, were 
Hedwig’s account of the peristomium of Bryum macrocarpum 
proved to be correct. sé 
To the observations now made on the various affinities of mosses 
which agree in having a naked peristomium, it may be added, that 
the genera with a simple peristomium do not form a strictly na- 
tural series, several of them being much more nearly related to 
those in which the peristomium is double than to each other. 
But if the correctness of these statements be admitted, it fol- 
lows that, in many cases to obtain natural genera in this order 
either additional sources of distinction must be sought for, or 
those at present in use more minutely investigated. | 
Of additional characters, which in some cases may be employed 
with advantage, I shall merely advert to the membranes of the 
capsule being distinct or contiguous, and to that more intimate 
union where there seems to be a single membrane only; to the 
modifications of internal structure of the inner membrane; the 
differences in form and duration of the columella, or even its 
being entirely wanting in the ripe capsule; the presence or ab- 
sence 
