22 
Didymodon Hedw. 
D. cylindricus (Bruch) Br. & Sch.—On old trunks. Mon- 
ROE, Delaware Water Gap, Rau; Carson, Onoko Glen, 
Austin; HIGH, Bear Creek, Wolle; CHESTER, Coventry, 
James. 
D. riparius (Aust.) Kindb.—Mownrog, Pocono Plateau, Azs- 
tin; LEHIGH and NORTHAMPTON, Bethlehem, Rau. [Pot- 
tia riparia Aust. ] 
D. rubellus (Hoffm.) Br. & Sch—On wet rocks. Without 
locality, Sull. & Lesq. Musci Bor. Am. Exsicc. no. 106. 
GRIMMITACEAE. 
Grimmia Ehrh. 
G. campestris Burchell—On rocks. LANCASTER, Cedar 
Hill, Porter; BLarr, Tyrone, James. [G. leucophaea Grev.] 
G. Donniana Smith.—In crevices of rocks. NORTHAMPTON, 
Bushkill Gap, James and Porter. [G. obtusa Schwaegr.] 
G. Olmeyi Sull.—On exposed rocks on river shores. NORTH- 
AMPTON, Easton, Porter; PHILADELPHIA and CHESTER, 
French Creek, James; LANCASTER, Small. 
G. pilifera Beauv.—On exposed dry rocks. NORTHAMPTON, 
‘Bethlehem, Rav; DELAWARE and CHESTER, James; Lan- 
CASTER, Muhlenberg; Conewago, Small. Very common. 
[G. Pennsylvanica Schwaegt. | 
Sehistidium Brid. 
8S. ambiguum Sull—On rocks. NorTHAMPTON, Easton, 
James. [Grimmia ambigua Sull.] 
S. apocarpum (L.) Br. & Sch—On rocks. L&EHIGH, Raw; 
NorTHAMPTON, Bethlehem, Raz, Easton, Porter; PHILA- 
DELPHIA and CHESTER, James; LANCASTER and CUMBER- 
LAND, Smadl; WASHINGTON, L222 and Szmonton,; MCKEAN, 
Burnett. [Grimmia apocarpa (L.) Hedw.] 
S, confertum Br. & Sch.—On rocks. PHILADELPHIA, on the 
