THE FERX BULLETIN 



107 



species as tropical Asia. It has been found in the 

 Malay Peninsula and Islands. 



From what has been said of the distribution of thig 

 plant it will be seen that our specimens are of consid- 

 erable interest in that the natural range of the species 

 is thereby extended to the north and east by about 

 1000 miles. The small size of the plant might, of 

 course, explain why it has not before been reported 

 from this region, even though it may not be uncommon 

 there, and this possibility makes the discovery of the 

 species of even higher interest to one interested in its 

 distribution. 



The drawings show a plant natural size with en- 

 larged detail drawings of certain portions, as indicated 

 by dotted lines. 



Carnegie Museum Herbarium, Pittsburgh, Pa. 



HUMUS-COLLECTORS AND MYRMECOPHILOUS 

 FERNS IN THE PHILIPPINES. 



The amount of study which has already been de- 

 voted to two of the most extraordinary specializations 

 of ferns, those for collecting humus and for associa- 

 tion with ants, spares me the necessity of entering into 

 the details of either. Of humus ^collectors, we have 

 at San Ramon, the nest-builders, Asplenium musae- 

 folium, A. phyllitidis and Drynaria rigidula; Polypo- 

 dia™ punctatum which makes brackets of leaf-bases 

 interlaid and overlaid with humus and detritus which 

 are sometimes 15 centimeters broad and almost as 

 deep but which does not normally form round nests ; 

 P. heracleum and Drynaria qucrcifolia, which in their 

 best development, form spiral brackets the supporting 

 leaves being in a single series but imbricate ; and Tliay- 



