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37. ORTHOTRICHUM PUMILUM Sw. Disp. Musc. Suec. 42, 92,44 
(1799). 
This species has an oblong cylindric capsule, half exserted, 
with a tapering neck and a short seta immersed in the ochrea. 
The capsules are 1.5 mm. long, occasionally shorter and ovoid, the 
neck half the length of the sporesac. The stria are very promi 
nent, teeth united in pairs, cilia 8 of two rows of cells. 
Type Norwegian. Frequent on trees in Scandinavia and 
Northern Germany, rarer in the ‘mountains of Central Europe. — 
This species has recently been determined by Dr. Venturi from 
specimens in our herbarium, collected by R. S. Williams, No. 52 ae 
‘On willows mouth of Sand Coulee, Montana, April 1, 1887." 
38. OrrHorkicnum Hatin S. & L. Sull. Icon. Musc. Suppl 63, 
t. 45 (1874). L. & J. Manual 170 (1884). 
From the’ description and figures this species seems to be ' 
lated to O. alpestre in its striate teeth, and to O. strangulatwn 
Sull. in its slender fugacious cilia, and short seta immersed in the . 
ochrea. The leaves are figured as papillose, and occasionally br 
stromatic. , 
In a recent letter Dr. Venturi says: “ The specimens of 0. : 
Halli, sent to me by M. Schrader, have the teeth erect when drys 
and they are striolate. I regard it as belonging to the group 
O. anomalum, and I have received it in the collection of M. Roll, 
from Helena, Montana, in the Rocky Mountains, of which I send 
you a specimen. With O. pumilum it is certainly not related.” 
I have not seen the type, though it probably is at Cambridge 
but plate 45 in the Icones Supplement, although it figures hei 
teeth erect, shows them united in fours, with intermediate cilia | 
and the habitat is given as “on trees.” I do not know who Bu 
Schrader was, nor whether we have any reason to suppose © 
his specimens were authentic, but shall take the first opportunity | 
of examining the type of this species and determining its relatio® 
The specimens sent to me ‘by Dr. Venturi from Roll’ s collectio® 
are without calyptra; the two capsules are still immature, with 
lids on, and do not show any very definite characters except © 
immersed stomata and partly exserted cylindric capsules. 
# Type locality: «On trees, Rocky Mountains. of Colorado, 
_ Hall.” Also collected at Helena, Montana, by Roll, No- ! 
