NEW AERANGEMENT OF 
analysing authors of the Muscologia Britannica first 
clearly explained, in the preface to their admirable work, 
the proper method of separating this genus from its allies ; 
and Dr Hooker, in Musci Exotici, has added several 
species. Bridel''s definition of Anictangium, " Pleuro- 
CARPi ; stoma nudum ; calyptra dimidiata subulata^'' does 
not separate it from Hedwigia ; and it is curious that the 
two " undoubted'''' species which he describes, are plants of 
two other genera, the one being a Neckera, and the other 
a Gymnostomum ; and Hedwigia aquatica, which has truly 
lateral setae, he places under Gymnostomum, characterised 
by its terminal setae ! 
In regard to the new species published by Dr Hooker, one 
was called an Anictangium by Hornschuch ; and another 
is the Leucodon Canariense * of ScHWiEORiCHEN and other 
authors. Of this, Drs Hooker and Taylor, in the Ad- 
denda to the Muscologia Britannica, remark, " We have 
received plants of Leucodon Canariense (Schwaegrichen) 
from our late lamented friend Professor Scmmidt of Nor- 
way, which he gathered in the Canary Islands; and we 
can safely assert that it does not belong to this genus." In 
Musci Exotici, we accordingly find this plant figured and 
described as Hedwigia Sehmidtii, but, probably by an 
oversight, there is no mention made of its being identical 
with Leucodon Canariense, which we find to be the case, 
from the examination of specimens of the Hedwigia re- 
• We might perhaps add to these H. Humboldtiiy of which we have seen 
specimens received by Dr Hooker from Guadaloupe, under the name of 
Hypnum taxiforme (Brid,), and said to have been named by Sprengel. We 
are afraid yet to assert them to be identical, until we have seen Schw^egri= 
CHEN or Bridel's plant, especially as that from Guadaloupe does not well 
agree with their descriptions. May not, however, Hi/jJ. nigrocaule be the 
same with Hc(L HimhoUltii ? 
