57<J Mr. Bbown on LijcUia, Lcptostomum, ami Buihaumia. 



of Good Hope, has the spherical striated capsule as well as the 

 inflorescence and ramification of Barti-amia : and with this genus 

 also Anktangium Humholdtii 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 X.o Fissidens and Neckera. 



Cali/mperes approaches to Orthotrichum, or rather, perhaps, to 

 Sclilotheimia or Macroinitrium. 



Lyellia, Avhich belongs to the same division of the artificial 

 system, is evidently allied to Dawsonia and Polytrichum. 



And lastly, Leptostomitm, 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. 



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 



