284 
THE JOURNAL OF BOTANY 
A comparison of the measurements of some of the parts with those 
of the type will perhaps best give an idea of the marked differences. 
The leaves of O. intricatum are from 1*5 to 2 mm. in length, in the 
variety they are *5 to ’(3 mm. The median cells in the type are 
narrowly linear, 3-4 fx in width, or more rarely 5 /x, and from 40 /x to 
G5 /x in length, i. e. roughly 10 to 15 times as long as wide. In the 
variety they are 4-5 /x wide, and about 30 fx long, i. e. averaging 
about 6 or 8 times as long as wide. 
O 
The great uniformity in the habit, dimensions, and structure in all 
the plants I have seen is a very marked feature, and renders the 
variety a clearly characterised one. The habitat and the distribution, 
too, are distinctive. The earliest specimen I have in my herbarium 
was gathered in 1890 by the late W. West, and determined by me 
as a form of O. intricatum, from about 2000 ft. on Peny-ghent. 
Mr. Wheldon collected it in the same year on calcareous sub-alpine 
rocks, Ingleboro. Mr. Cheetham gathered it in some quantity on 
limestone walls and rocks at 2000 ft., on Ingleboro, in December 
1912 and January 1913. During the present year Mr. Albert 
Wilson collected it on Yoredale limestone rocks at 2100 ft. on the 
north side of Ingleboro, and has since found that he had gathered 
the same moss in 1919 on Yoredale limestone at 1900 ft. on Barbon 
High Pell, Westmorland. These gatherings were all made indepen¬ 
dently, and without the moss being definitely determined. As regards 
the habitat, Mr. Wilson wrote to Mr. Wheldon on 16 July of the 
present year as follows :—“ On getting your letter I was just starting 
for Chapel-le-dale, so I decided to make another investigation of the 
rocks on Ingleboro, where I found the plant. I felt sure that 
Mr. Dixon was right in regarding it as a condensed form of O. intri- 
catum. I ascended Simons Pell, and examined some Yoredale lime¬ 
stone rocks, on which I found the same moss as on Ingleboro, so I 
did not need to go to the original locality. The moss occurs in shaded 
rock crevices, and a form rather nearer to the type occurs in more 
open spaces on the same rocks. I have similar plants gathered a few 
years ago on Barbon High Pell, Westmorland.” 
I have not seen it from any other formation, and it would seem 
to be confined to a very narrow range of altitude, but this may be 
governed by the outcrop of the Yoredale limestone being limited in 
the district to these altitudes. 
The following is a diagnosis of the new variety:— 
Ortitotttecium intricatum (Hartm.) Bry. Eur. nov. var. ab- 
breviatum Dixon. 
Yarietas quam nlanta typica omnibus partibus multo minor, 
abbreviata. Csespites perdensi, humiles, nigro-virides vel olivacei. 
Caulis multo gracilior, filiformis. Folia minima, *5-’6 mm. longa, 
anguste ovato-lanceolata, multo brevius acuminata. Areolatio valde 
brevis, e cellulis medianis 4-5 /x latis, circa 30 /x longis, apicalibus 
paullo angustioribus, basilaribus parum latioribus, per totum folium 
suba?qualibus, instructa. 
Jlab. On Yoredale limestone rocks, 1900-2100 ft. alt., Ingleboro, 
West Yorkshire; C. A. Cheetham, Dec. 1912 ; and other localities 
mentioned above. 
