110 



PLANT-LIFE 



The gills are pink when young, but in maturity they are 

 brown. The whole fructification is formed of hyphae. 



Fig. 36. — Life-History of a 

 Mushroom. 



A, Mycelium (m) bearing young 

 fructifications. B, vertical 

 section of very young fruc- 

 tification; m, mycelium. C, 

 fructification further ad- 

 vanced, the gills (I) appear- 

 ing. D, fructification still 

 more advanced; I, gills; m, 

 mycelium. E, older fructifi- 

 cation; I, gills; st, stipe; v, 

 velum. F, almost fully de- 

 veloped; h, pileus; I, gills; 

 v, velum; m, mycelium. 



Pig. 37. — Lamellae, or Gills, of 

 Mushroom. 



A, Small portion of tangential section 

 of pileus (h), with gills (I) magnified. 

 B, section of single gill, x 80; trama 

 (t); hy, hymenium; sh, sub-hymenial 

 layer; r, lower edge. C, Enlarged 

 part of B, x 370; q, paraphyses; 

 s^s^, basidia in different stages of 

 growth; sp, basidiospores ; sh, sub- 

 hymenial layer; t, cells of trama. 



We now turn to Fig. 37, from which we shall learn 

 some interesting facts in regard to the gills. A repre- 



