Journal of Mycology 
VOLUME 12 — NOVEMBER 1906 
TABLE OF CONTENTS 
Long — Notes on New or Rare Species of Ravenelia. 233 
Atkinson — A New Entoloma from Central Ohio. 237 
Kellerman — Fungi Selecti Guatemalenses. Bxsiccati Decade I... 238 
Morgan — North American Species of Lepiota (Continued).242 
Kellerman — Index to North American Mycology.249 
Index to Volume 12.273 
NOTES ON NEW OR RARE SPECIES OF RAVENELIA, 
W. H. LONG. 
In the study of the genus Ravenelia the following characters 
have been found of much importance. Some of them are often 
omitted from descriptions, hence attention is called to them: 
I. The position of the sori, whether sub-epidermal or sub-cut- 
icular. 2. The number and position of the germ pores of the 
uredospores. 3. The position and number of the cysts. These 
are all constant characters for any given species and can surely be 
determined from the usual herbarium material, as drying does 
not destroy them. The first must be determined by sectioning the 
host; the germ pores by boiling in a solution of 50 per cent, 
lactic acid, and the cyst characters by glycerine and lactic acid 
mounts. 
Uredospores of the globose or sub-globose type have germ 
pores many and scattered, while those that are distinctly longer 
than broad have few (4-8) germ pores in one or two definite 
rows. 
The position, shape and number of the cysts are of vital 
importance and should be carefully noted. 
A good means of studying this character is to mount the 
specimen in a mixture of equal parts of 95 per cent, alcohol and 
100 per cent, glycerine. In this the cysts will swell very slowly, 
thus giving time for observation. Often a drop of 50 per cent, 
lactic acid will have to be added to produce the desired result, 
viz., a slow swelling of the cysts, thus revealing their shape and 
position; or even boiling may have to be resorted to in order to 
clear up the heads and swell the cysts ready for high power study. 
Cysts that are oppressed to the under surface of the head will 
