78 
KEW ARRANGEMENT OF 
Hab. Europe and North America, where it is chiefly 
found in subalpine countries, growing in woods, and dry, 
sandy, heathy places, on the ground. 
Hist. This plant was described by Haller and Dil- 
LENius as a Sfliagnum. By Schmidel it was added to 
Buxhaumia, a genus to which it has been also referred by 
Hedwig, Schw.egrichen, and a great many modern 
authors. Jacquin and Necker at different times made it 
a Bryum. Hudson called it a Pliascum, in which he was 
followed by Lightfoot and others. Ehrhart , finding the 
peristome to differ from Buwbaumia, threw it into a distinct 
genus, which he called Wehera. Mohr, however, in his 
Observ. Bot. changed it to Dipliyscium. Hymenopogon^ 
the only other name it has since received, was bestowed by 
Palisot de Beauvois, who was not aware at the time of 
that of Diphyscium. His name is justly remarked by Dr 
Hooker, to be so much more applicable, that we cannot 
but regret that it was published subsequently to Mohr's 
Observationes, which renders it impossible for it to be 
adopted." 
PLATE III. 
Fig. 1. Plants of Dipliyscium Jhliosum. 
% Theca of the same, with the operculum not re- 
' moved. 
3. Calyptra. 
4. Operculum, with the upper part of the columella, 
which generally remains thus attached, if the 
operculum be forcibly removed. 
5. Peristome and movith of the theca. 
6. Structure of the cauline leaf. 
7. Cauhne leaves. 
8. Perichsetial leaf 
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