t:HAkA(:THRS Of- WL SJIkUU.WS. 



•J5-) 



of the pileii^, r.uiiatin;^ tr<»m the stem ti> the margin. When the 

 pileus is cut in halves the general outline ot the gills may be observed, 

 in outline they may be broad, narrow, lanceolate, triangular, etc. 

 In respect to their ends they are jtliiiuate when gradually narrrtwed 

 to a sharp point, acuti' when they end in a sharp angle, and ohtuse 

 when the ends are rounded. Again, the gills are iircuatc when they 

 arch from the stem to the edge of the pileus, and Vititricosc when 

 they are bellied out vertically toward the earth. 



Fir.KRF. 217. 



Clitocybe infundibuliformis, pileus 

 fundibuliform, gills decurrent. 



P'icuRK 21S. 



Mycena galericulata, pileus conic to 

 campanulate. gills decurrent by a 



tooth, stem fistulose. 



The terms given above are often used in descriptive works, but 

 the most important feature to be noted in the section of the plant is 

 the relation of the gills to the stem. This relation is represented by 

 several distinct types which are sometimes used to limit genera or 

 sub-genera, since the mode of attachment is usually constant in all 

 species of a group. The principal relations of the gills to the stem 

 are described as follows : ^Jnatr when they reach the stem and are 

 set squarely against it (Fig. 220) ; iiirunriit when they run down 

 the stem (Fig. 217); sinuate or cmarginatc when they have a notch or 

 vertical curve at the posterior end (Fig. 219); and fiw when they 



