58 



KE8E ARCHES OX FrXCJI 



in respect to their direction of growlli, by both ifravity jiiid lii,dit. 

 The branches trrow in the dark in curves whicli lake tlie most 



KiG. 20. — Fruit-body of Polyporux xquamosus developed on a loi,' in entire 

 absence of light, three weeks old. It is branched and sterile: there are 

 no signs of a pileus. Cf. Figs. 1, 4, and 5. Reduced to % natural size. 



varied directions in space, and show no detinite indications that 

 they are either positively, negatively, or transversely geotropie. 



Light from a small hole cut in the dark-rodin door was allowed 

 to fall obliquely on to the log njxm which some almost fully 



