CHAkACIHkS CJl- .MUSHI-^OO.MS. 



mere veins or ridges. Again, tlic edge is generally oitire, i. e., not 



noticeably toothiJ, but in lAiitiniis it is ottni toothed or cut in various 



ways. In some other 



plants the edges are 



seniiLite, nrnii/a/e. 



eti.-. hi Sflii ;oph vi- 

 lli ni ahh'uin. a small 



whitish plant very 



c m m on o n d e a d 



sticks, the gills are 



split lengthwise 



along the edge with 



the halves revolute. 



i. e., rolled back. In 



Copriiius the gills 



and often a large 



part of the pileus 



melt at maturity into 



a dark, inky fluid. 

 The hymenium. — 



The term hyDuiniim 



is applied to the 



spore-bearing tissue 



of many fungi. In the Agjricaccce the hymenium covers the entire 



surface of the gills and usually the portion of the pileus between 



the gills. It originates 

 in the following man- 

 ner : the threads form- 

 ing the trama of the 

 gills grow out from the 

 lower side of the pileus 

 and perpendicular to its 

 under surface. As 

 growth advances man\' 

 branches of the threads 

 turn outward toward 

 either surface of the gill 

 and finally terminate 

 in club-shaped cells. 



ric.i RK 223. — Inocvbe repaiula (Hull.) Hres. (= Ento- _ 11 u ■ 



lonia repanduniHull.). /. trama of pileus ; j//, sub I hese CellS, therefore, 

 hymenium; //, the hymenial layer; the long cells \\q side bv side perpen- 



FiciRK 222. — Section of portion of gill of Marasmius 

 cohaerens. /, trama of gill ; s/i, subhymenium ; //, 

 hymenium layer. The long, dark cells are brown 

 cystidia, termed spicules by some to distinguish them 

 from the colorless cystidia. The long cells bearing 

 the oval spores are the basidia. 



with a drop of moisture at the ends are cystidia 

 (sing, cystidium). 



dicular to the surface, 



