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come epiphyllous, and I was surprised to find such Lichens as Usnea florida, 

 Sticta aurea, and species of Leptogium, of ParmeHa, of Theloschistes, and of 

 Lecanora growing as epiphylls. However, I do not think that anyone ever 

 thinks of these as characteristically leaf-inhabiting Lichens. Some individuals 

 of these Lichens, in such a favorable climate, become epiphyllous merely by ac- 

 cident. Many other Lichens, on the contrary, seem peculiar to leaves, and were 

 never found anywhere else. Such Lichens I would call truly epiphyllous Lichens. 

 The leaves of some plants evidently furnished ideal substrata, whereas the leaves 

 of other plants never harbored a single specimen. The leaves of Podocarpus, for 

 example, were literally covered with epiphyllous Lichens. 



Only a few of these strictly epiphyllous species have thus far been determined. 

 Among these are a Pyrenula-like species, evidently, Pyrenula (Porina) epiphylla, 

 occurring on Podocarpus; an Opegrapha, which seems to be 0. phyllobia, on Cal- 

 listemon ; and Pilocarpon tricholoma, growing on cypress. 



Another interesting phase of my study of the Lichens of Cinchona, was 

 listing the number and kinds of species growing on each of the various trees and 

 shrubs, and on the buildings around the garden. Thus on a rose-bush near the 

 house grew the following: Usnea florida, Lecanora varia, L. subfusca, Ramalina 

 sp., Parmelia sp., Lecidea sp., Usnea hirta, Graphis sp., Pertusaria sp., Collema sp., 

 and Haemalomma puniceum. 



The bamboos were singularly free from Lichens, and yet on nearly all of them 

 grew Opegraphela fiUcina. 



A comparative study was made of the Lichens found on a Cryptomeria and 

 those found on two Junipers. One might think that the Cryptomeria would 

 harbor practically the same species that were found on the Junipers. But there 

 were marked differences. Cryptomeria was very sparsely inhabited by Graphis, 

 Arthonia, Lecanora, and Pertusaria. On the other hand, it seemed to be the 

 ideal host for a Calicium, and for a species of Lecidea. Again, Parmelia found 

 the Cryptomeria to its liking, whereas, Sticta preferred the Junipers. 



I was rather surprised to find that over 20 species of Lichens grew on the 

 roof of our laboratory. Usnea species, and Cladonia species predominated, but 

 it seemed that almost any Lichen might be expected; any species that could live 

 on old wood, on rotting wood, or on humus. 

 University of Maryland, 

 June, 17TH, 1921 



SPHAGNUM USED AS A SURGICAL DRESSING 

 IN GERMANY DURING THE WORLD WAR 



J. W. Hotson 



During the recent war much attention was given, especially in Great Britain, 

 to the making of surgical dressings from sphagnum moss. Even before the 

 United States entered the war these dressings were in quite general use in the 



