Mr. Brown on Lyellia, Leptostomum, and Buxbaumia. 575 
Gymnostomum or Anictangium pulvinatum agrees in every other 
part of its structure with Gris 
(^ Gymnostomum lapponicum, notwithstanding the difference of ca- 
lyptra, may be considered as related to Grimmia Daviesii, and 
consequently to Orthotrichum, which G. Daviesii* resembles in 
its teeth being approximated in pairs. 
G ymnostomum viridissimum has exnoily the habit and calyptra 
of Zygodon. | | 
Gymnostomum pennatum (Schistostega of Mohr,) i in one remark- 
able character may be compared with Fissidens}. 
Anictangium aquaticum is evidently related to Cinclidotus or 
Trichostomum. 
Gymnostomum julaceum and Hedwigia secunda of Hooker resem- 
ble certain species of Pterygynandrum, Neckera and Leskia. —— 
An unpublished moss (Glyphocarpa capensis) with a naked pe- 
ristomium, which I observed on the Table Mountain of the Cape 
* Griffithia Daviesii nob. - 
T As Schkuhr (in Krypt. Gewüch. ii. p. 31. t. 12.) has ascertained that the — of 
Gymnostomum pennatum separates entire, the genus Schistostega must be again reduced 
to Gymnoslomum, until other distinguishing characters are discovered. 
Its resemblance to Fissidens consists in the somewhat similar disposition of leaves. 
In Fissidens, as limited by Bridel, (Muscol. Nov. p. 186) 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 Z. cit.) has formed a separate section of the order, consisting of 
Fissidens and Octodiceras ; and hence also M. de la Pylaie has changed the name of Fissi- 
dens to Skitophyllum. (Journal de Botan. Applig. iv. p. 133.) It seems 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 reduced in size, and in some cases entirely wanting, as they 
universally are in the perigonial leaves, which have likewise the more ordinary form, being 
moderately concave and not even navicular. 
of 
