TABLE 0? GOITTENTS 



I. IITTRODUCTIOIT 1. 



II.GEITERAL OBSERVATIONS 2-16 



1, Characteristic floras of se^^en hatitats for 



Polypodiura as exhibited by stations 1 to 7 2-12 



2, Results of general observations on the distribution 



of the fern 13-14 



?, Conclusions 15-16 



III.SUimARY OF LITERATTrRE ON BIOLOGY OF EPIPHYTES 17-29 



IV.MEASIJREMEtTT AND COMPARISON OF ENVIRONJffiNTAL CONDITIONS 



A.Climatic Conditions 3C-46 



1, Introduction ?0-32 



2, Methods 3S-35 



(a) Light 32 



(b) Relative humidity of the air ,33 



(c) Evaporating pov/er of the air 33 



(d) Temperature of the air , 33 



(e ) Temperature of the substra,tum 34 



3, Results 35-46 



B.Some Features of the Chemical Composition of 



Polypodium. aJid Its Substratum 46-51 



l.Repults of -inaljTfJp of the epiphyte, of the humus 



and of the supporting bark , 46-49 



2, Acidity of the substratum 49-51 



