Mr. BKO^vx on LijcUia, Lcploslomum, and Buxhaumia. 575 



Gymnostomum or /inictangiiim pulvinaium agrees in every other 

 part of" its structure with Grimniia. 



Gymnostonmin /o/>y;o?(?c«/;2, notwithstanding the dift'ercnce of ca- 

 lyptra, may be considered as rehited to Grimmia Daviesii, and 

 consequently to Orthotrichum, which G. Daviesii* resembles in 

 its teeth being approximated in pairs. 



Gymnostomum viridissimiim has exactly the habit and calyptra 

 of Zygoclon. 



Gymnostomum petinatum (Schislostega of Mohr,) in one remark- 

 able character may be compared with Fissidens-f. 



Anictangium aquaticum is evidently related to Cinclidotus or 

 Trichostomum. 



Gymnostotnum julaceum and Iledwigia secunda of Hooker resem- 

 ble certain species of Fterygynandrum, Neckera and Leslcia. 



An unpublished moss {Glyphocarpa capensis) with a naked pc- 

 ristomium, which I observed on the Table Mountain of the Cape 



• Griffilhla Daviei'n nob. 



t As Sclikuhr (in Krypt. Gewilch. \\. p. 31. t. 12.) has ascertained that the operculum of 

 Gymnoitoimim pennaium separates entire, the genus Schisloslcga must be again reduced 

 to Gymnoslomum, until other distinguishing characters are discovered. 



Its resemblance to Fissidcns consists in the somewhat similar disposition of leaves. 



In Fissidens, as limited by Bridel, {Muscat. Nov. p. 1S6) the leaves are universally de- 

 scribed as presenting their margin instead of their disk to the stem, and as having a dou- 

 bling of the lower half of their inner or upper margin, extending as far as the nerve. 



On this view Bridel (in I. cit.) has formed a separate section of the order, consisting of 

 Fiisidens and Oclndiceias ; and hence also M.dc la P^laie has changed the name of Fissi- 

 dens to Skilcpliyllum. {Journal de Bolan. Appliq. iv. p. 133.) It seeins to me a much simpler 

 explanation of the apparent anomaly to consider the supposed doubling or division of the 

 leaf as its true disk, and the deviation from the usual structure as consequently consisting 

 in the greater compression of the leaf, and in the addition of a dorsal and terminal wing. 

 In support of this view it may be observed, that in the lower leaves of the stem both the 

 additional wings are greatly re<Iuced in size, and in some cases entirely wanting, as they 

 universally are in the pcrigonial leaves, which have likewise the more ordinary form^ being, 

 moderately concave and not even navicular. 



o£ 



