— xiii — 
Report of the Curator of the Hepatic Department. G. H. Conklin. . . 23 
Report of the Lichen Department. Charles C. Plitt 24 
Notes on North American Hepaticae. — IX. Alexander W. Evans 25-33 
Miscellaneous notes . . 37, 60, 1 1 i-i 12 
Notes on Current Bryological Literature. E. B. Chamberlain. 
38-40, 94-96, 109-11 1 
The Bryophytes of Michigan with particular reference to the Douglas Lake 
Region. Geo. E. Nichols 4i~58 
Book Review: Lofmossovnas Utbredning i Sverige, by Hjalmar Moeller. 
Annie Lorenz 59-60 
Mosses of the Rocky Mountains Park, Banff, Alberta, Canada. W. H. 
Emig 61-66 
Hymenostomum in North America. IL The Case of Astomum Sullivantii. 
A. LeRoy Andrews 66-71 
Recent Studies on Certain Species of Riccia. Alexander W. Evans 81-86 
The Mosses of the Oxford University Expedition to Spitzbergen, 192 1. 
H. N. Dixon 86-89 
On Some Mosses from the Blue Mountain of Cuba. Elizabeth G. Britton. 89-90 
Leptobryum Escomeli Ther., Sp. Nov. L Theriot; . 90 
Note on a form of Pottia Heimii from Greenland. H. N. Dixon 92 
Notes 93 
Duplicate specimens for exchange 96, 112 
The status of Gyroweisia in North America. A. LeRoy Andrews 97 
A Preliminary Report on the Lichens of Western Pennsylvania. Giovanni 
L Giardini 100-108 
INDEX TO AUTHORS 
Andrews, A. LeRoy. .66-71, 97-100, 
108-109 
Britton Elizabeth G 89-90, 108 
Burnham, Stewart H..1-8, 34-37, 
58-9, 72-80 
Chamberlain, Edward B.. 20-22, 38-40 
Conklin, George H 23 
Dixon, H. N 86-89, 92-93 
Emig, W. H 61-66 
Evans, Alexander W. ...25-33, 81-86 
Giardini, Giovanni I 100-108 
Grier, N. M 9-12 
Grout, A. J 13-14 
Gyorffy, Istvan 18 
Holzinger, John M 16-17, 19. 37 
Jennings, O. E I11-112 
Kaiser, George B 14-16, '22 
Lorenz, Annie 59, 60 
Nichols, George E 41-58 
Plitt, Charles C 24 
Smith, Annie Morrill 20 
Theriot, 1 90-92 
INDEX TO PLATES AND FIGURES 
Campylopus infested with Cladosporium herbarum Fig. i, p. 18 
Diplophyllum Andrewsii Plate I, figs, i-ii, p. 30 
Leptobryum Escomeli Figs. ia-5a, p. 91 
Wilsoni Figs. ib-5b, p. 91 
Ptychocoleus heterophyllus Plate I, figs. 12-15 
ERRATA 
Page 4, line 8, for sanguineoaira read sanguineoatra. 
Page 18, line 8, for herharo read herbarum. 
Page 18, line 11, for prodito read prodita. 
Page 18, line 21, for determinare read determinari. 
Page 18, line 22, for tamen vera read determinatio videtur tamen vera. 
Page 18, line 23, for herbari read herbarum. 
Page 18, line 24, for coniidifera read conidiifera. 
Page 18, line 25, for herbari read herbarum. 
Page 18, line 5 from bottom, for priman read primam. 
Page 18, under Fig i, for Compylopus read Campylopus. 
Page 30, in legend for plate, for Ptychocleus read Ptychocoleus. 
Page 32, line 3, for Hartland read Hartford. 
Page 45, line 4 from bottom, for hampeana read Hampeana. 
