THE GENERA OF MOSSES. 
n 
ceived from Dr Hooker himself, and compared with the 
Leucodon, which was presented to us by botanical friends 
abroad. In this moss, the same learned bryologist re- 
marks, " Capsula ore contracto, intus membrana annulari 
alba;" and afterwards, "The annular membrane within 
the mouth of the capsule of this moss was noticed by its 
lamented discoverer Dr Christian Schmidt, and it is 
very evident in all the specimens I possess." 
Notwithstanding, this plant is really a Leucodon: we 
observed the above mentioned membrane exhibiting, as it 
were, traces of sixteen separate teeth, each furnished with 
a dark longitudinal line ; and it gave us therefore no small 
pleasure to find the sixteen broken-ofF parts of the teeth 
adhering closely to the interior of the operculum. Thus, 
DiLLENius's figure, tab. S9. f. 41. is more accurate than 
has been supposed. 
PLATE 11. 
Fig. S9. Theca of Hedwigia aquatica, with the opercu- 
lum on. 
40. Sporules of the same. 
41. Theca of the same divided, to shew the colu- 
mella, which is elongated to the summit of 
the operculum. 
42. Theca of Hedw. Hornsclmchiana. 
43. Theca of H, Humboldtu^ copied from Hooker. 
44. Calyptra of the same. 
45. Structure of the leaf in Hedw. aquatka. 
All the figures more or less magnified. 
