HYMENOMYCETES. 



327 



come densely felted into tough masses five to ten or more 

 millimetres in thickness, and of many centimetres in 

 breadth and length ; it frequently also becomes compacted 



Fig. 226. A, cross-section of the gills or lamellse (I), of Agaricus campestris h, 

 portion of pileus ; B, section of one of the gills, more highly magnified ; t, the cen- 

 tral tissue of the gill (trama) ; sh, the snb-hymenial layer of short, rounded cells ; 

 hy, hymenium. (J, a small portion of B, more highly magnified (X 550) ; t. trama ; 

 gh, sub-hymenial layer ; q, young basidia and paraphyses ; *', basidium with spores 

 in earliest stage; n", basidium with spores nearly ripe; '", basidium with ripe 

 spores ; "", basidium from which the ripe spores have fallen. After Sachs. 



into cylindrical root-like forms (Fig. 225, A, in). Upon the 

 mycelium there arise, after a longer or shorter period of vege- 

 tation, small rounded or oblong masses, the young sporo- 



