CONTENTS 
FAGB 
Observations on Sphaerosoma and Allied Genera 
Fred J. Seaver 103 
North American Species of Peridermium on Pine 
Joseph Charles Arthur and Frank Dunn Kern 109 
The Development of Stropharia ambigua 
Sanford M. Zeller 139 
Mountain Myxomycetes - - T. H. Macbride 146 
News, Notes and Reviews 150 
Index to American Mycological Literature - - - 155 
The New Era Printing Company makes the following charges to authors for 
articles reprinted from Mycologia, if ordered with proof: 
Without Cover — 
4 PP- 
8 pp. 
12 pp. 
16 pp. 
20 pp. 
24 pp. 
28 pp. 
3 » pp. 
25-50 Copies — 
*i -37 
*1.87 
I2.12 
#2.50 
* 3 - 5 ° 
*4.05 
*4.82 
15.20 
too “ 
*- 5 S 
2.15 
2.65 
3*5 
405 
5.00 
6.10 
6.50 
200 “ 
2.00 
3-05 
4.00 
4-3° 
5.60 
6.90 
8.30 
8.90 
Coven — Fint 50 — $1.00. Additional, ic each. 
Plates — 40c per 100. 
