316 Mr. Brown's Observations on the 



a structure, it may be remarked, equally militates against M. Bca-a- 

 vois' theor}', whether we suppose the columella to have existed 

 at an earlier stage, in the usual form, or not. 



As to this organ being tubular, and discharging its contents by 

 the top, it is neither consistent with what has been already ob- 

 served, nor with the appearance of its remains in the ripe cap- 

 sule : but admitting for a moment its tubular nature, there are 

 certain ]\Iosses in which no discharge could possibly take place 

 in the way described; the column being elongiited even to the 

 apex of the operculum, to which it often continues to adhere, as 

 in Biixbauniia, and in the first of the two new genera which I 

 now proceed to describe. 



DAWSONIA. 



'Peristomium penicillatum, ciliis numerosisslmis capillaribus rectis 

 aequalibus e capsulse parietibus columell^que (!) ortis. 



Capsula hinc plana, indfe convexa. 



Cali/ptra exterior e villis implexis, interior apice scabra. 



Muscus lihic arete affinis Polytricho, quo cum foliis, jioribus mas- 

 ailis, et cah/ptrd penitils convenit ; inde, aliquo modo. Bux- 

 baumiae accedens, prcesertim jigurd capsula, et structuru colu- 

 mella. Peristomio autem ab omnibus diversissimus. 



Daavsonia polytrichoides. 

 Tab, XXIII. Fig. 1, 



Patria. Novse Hollandiae ora orientalis, extra tropicum, 

 Statio. Ripae subumbrosae rivulorum, ad radices montium, in 



vicinitate Portfls Jackson. 

 Desc. Ccespites laxi, amorphi. Radicula tenuissimae, tomenti 



instar 



