unexpectedly in moist cavities along the beds of some of the swiftly running 
mountain streams. 
Polytrichum Ohioense R. & C. has now been collected in fourteen counties 
of Western Pennsylvania; P. commune (L.) Hedw. from seventeen. P. strictum 
(Banks) Menzies has been found in a small Cassandra bog in the Pymatuning 
Swamp and what appears to be a rather sickly specimen of the same species was 
collected in the midst of a large tuft of Leucohryum from a hill-top in Washington 
County. P. piliferum (Schreb.) Hedw. is now accredited to three counties. 
The Catharinaeas proved particularly puzzling, there being apparently a 
couple of undescribed species rather common in the deep shaded ravines of the 
region. Some of these specimens have from 7 to 12 lamellae of 8 to 14 cells 
height and covering about two-thirds to three-fifths of the upper leaf width. In 
the manual the writer proposed two new species based on these forms. What 
was taken to be the true C. angustata (Brid.) Brid. is rather rare in Western Penn- 
sylvania. Since the publication of the Manual, however, more material has been 
secured and it appears that there is a pretty complete series of intergradations 
between the plants called C. angustata , papillosa, and plurilamellata. ( See 
Plate II, taken from the Manual of the Mosses of Western Pennsylvania, p. 402, 
Plate XXVII.) 
Buxbaumia aphylla L. was sought for in vain for several years, although 
reported from the* northern part of the region (Cameron County) in Porter’s 
Catalogue. Finally, however, Mrs. Jennings, in 1910, located a few specimens 
under beech and hemlock trees on the banks of a little ravine about forty miles 
north of Pittsburgh, and early in May, 1913, Prof. A. R. Hillard of the Edgewood 
High School collected it about eighty miles northeast of Pittsburgh. On May 
17, 1913, the present writer found it on bare clay banks along the roadside on 
the slopes of Chestnut Ridge about forty-five miles east of Pittsburgh. In the 
last named locality it appeared to be growing on soil covered by the protonema 
of Pogonatum and associated with Webera sessilis (Schmidt) Lindb. There are 
at least eleven localities now known for Buxbaumia in the state of Pennsylvania. 
Webera sessilis has now been found in about half a dozen places in Western 
Pennsylvania; but always on clay roadside banks in the mountains. 
An interesting find of 1913 was the discovery in two places in the Pittsburgh 
district of Pleuridium alternifolium (Kaulf.) Rabenh., April 20 and 24, respect- 
ively. In both instances the moss was discovered growing in sandy-clay soil 
in hillside meadows. So far as known to the writer this species has not before 
been reported in Pennsylvania, although P. subulatum (L.) Rabenh. has been 
reported about twenty-five miles southwest of Pittsburgh. 
Lesquereux’s Slippery Rock Creek station for Bryoxiphium has been searched 
for in vain and it is not improbable that man’s activities in that region in quarry- 
ing the excellent “Homewood” sandstone along the stream may have destroyed 
the habitat. 
Probably the most generally distributed moss in Western Pennsylvania is 
Dicranella heteromalla (L.) Schimp. The writer’s collections for this species 
number over ninety localities all over the region, and this represents only a small 
