THE GENEKA OF MOSSES. 
69 
una* in habit comes near to Gymnostomum rupestre. 
Some are also in habit nearly allied to several Leucodontes, 
to Hypnum, Fontinalis, and to some Neckerae. Indeed, 
were it not from a wish to bring all the Gymnostomoid 
plants together (on account of their characteristic fructifi- 
cation), we would have confined that tribe to those genera 
furnished with terminal setae alone, and have removed 
Hedwigia to the Hypnoid division. 
The calyptra seems in all to be strictly dimidiate. Jac- 
auTN, in his Flora Austriaca, made it mitriform, but he 
had only seen it in a young state. " Calyptra mihi pluries 
omnino dimidiata subulata, cucuUiformis,'- says Bridei., 
and we entirely accord with him. 
Hab. These plants are natives of Europe, South Ame- 
rica, Guadaloupe, and some of the South Sea Islands. 
None are found in Britain, though H. aquatka is by no 
means very rare on the Continent. Their situation is va- 
rious, some growing in water, others on rocks and trees. 
They seem also to be exposed to a considerable range of 
temperature ; from the mild rivulets in the south of France 
to the loca frigida " of the Andes. 
Hist. The only species known to Dillenius and 
LiNN^us was described by them as Hypnum aquaticum. 
Hedwig, in his Stirpes, changed the generic name to 
Hedwigia; but afterwards, in his Species Muscorum, 
removed it to Anidangium, in which he was followed by 
ScHw^/EGRiCHEN in the Supplement to that work. The 
" May not Schwjegrichen's conjecture be correct? " H, Hornschu- 
chiana ambigua videatur, nisi forte flos femineus initio, etiam terminalis sit, 
et tantum per caulis innovationem lateralis reddatur." We ourselves have 
little doubt on the subject, and only hesitate to remove this plant to Gymno- 
stomum, until we shall have an opportunity of examining more specimens. 
