CONTENTS. 



Page. 



Introduction 7 



Economic importanre of I.(Mizilei^ scpiaria S 



Distribution and host woods of Lenzites sepiaria 8 



Geographic distribution 8 



The fungus in foreign countries 8 



The fungus in the United States 10 



Kinds of wood attacked by Lenzites sepiaria 11 



Method of entrance and rate of growth of lienzites sepiaria 13 



The fungus 14 



Its name 1"! 



The sporopliores 14 



Development of the sporophores , 16 



Tlie mycelium 17 



Tlie spores 17 



Germination of tlie spores 18 



Cultures 18 



Inoculations 19 



The decayed wood 20 



External appearance of timber 20 



Internal appearance of timber 21 



Microscopic examination of affected wood 2.^ 



Microchemical tests of affected wood 23 



Proof that Lenzites sepiaria caxuses the decay 24 



Factors governing the growth of wood-rotting fungi 24 



Food materials 24 



Air supply 25 



Water supply 26 



Temperature 2G 



Methods of prcncnting tlie decay caused Ijy Lenzites sepiaria 2G 



Seasoning of timber '-7 



Floating of timber 28 



Ti'eatment with chcmirals 28 



Summary "^ 



Bibliography ^1 



Description of plate;; 40 



Index 41 



214 5 



