128 HEAPvT-ROT CAUSED BY OTHER FUXGI 



already eaten and destroyed by insect larvae. It is never 

 perennial. 



The inner part of the fructification is mainly composed 

 of masses of parallel, very tender, richly septate, red brown 

 hyphae, filled mth protoplasm. On the upper side many 

 of the masses run up into the scales that project fi-om the 

 upper surface ; those on tlie lower side run down into the 



trama between the pores, and ac- 

 cording to Hartig it is the escape 

 of the contents from these hyphae 

 that gives the red colour on bruis- 

 ing. The pores are irregular in 

 shape (fig. 47), and from 0*5 to 

 2 mm. in diameter. Their depth 

 is about T) mm. Near the stipe 

 the pores are long and labyrin- 

 thine, but tlie margin is l)arren 

 until marginal growth has ceased, 

 when pores are formed out to the 

 edge. Inside, the pores are lined 

 by tl\e hymenium, which is com- 

 posed of basidia and various forms 

 of paraphyses. The basidia are 

 colourless or very pale yellow, 

 30-40 X 5-8 IX. The spores are 

 about 4X ju (fig. 48). In addition 

 to the basidia tliere are numerous 

 tliin-walied parapliyses and larger specialized thick-walled 

 paraphyses {cysiidi^). As shown in this figure the cystidia 

 are very varial)lc in shape and size. They have deep brown 

 contents, and tlie large brown liy])liae whicli carry them can 

 often 1)0 traced for some distance back into the trama. Tlie 

 cystidia jii'oject into the pores beyond the basidia, and 

 often beai- (lro])s of li(|uid at their extremities to which 

 spores adhere. Thus it ap])ears that the cystidia obstruct 

 the noi'inal (lis])ersal of the spores. 



When the fiuctifications are growing actively the s])ores 

 fall fi'om them in clouds, dense enough to be seen with the 



Fig. 48. — Hymenial layer 

 of Pdhiporus SrJnrtinitzii, 

 Hhowiiig ba.sidia (6). basidio- 

 B])ores (,<(), para])liyse.s {p), 

 and cystidia (r) ( x l]()()). 



