322 



RESEARCHES ON FUNGI 



of basidia, paraphyses, and cystidia. The basidia, as in most 

 Coprini, are dimorphic. The camera-lucida drawings B and C in 

 Fig. 142, as well as the semi- diagrammatic Fig. 144, show : (1) that 

 the basidia are packed closely together ; (2) that the spores of the 



long basidia often partly over- 



stand the spores of the short 

 basidia ; and (3) that the short 

 basidia are more numerous 

 than the long ones.^ The 

 paraphyses (Figs. 142, C, and 

 144) form a continuous pave- 

 ment in which the basidia and 

 cystidia are set at intervals. 

 In Fig. 142, D, are shown in 

 perspective the long and short 

 basidia with their spores, and 

 the paraphyses. 



A transverse section through 

 the gUls of an unexpanded 

 fruit-body is represented with 

 low magnification in Fig. 143. 

 Here one especially notices 

 (1) the dark sides of the gUls, 

 the darkness being due to the 

 projecting parts of the long 

 basidia and to the two layers 

 of spores, and (2) the cystidia 

 crossing the interlamellar 

 spaces. As shown in Figs. 144 

 and 145 in more detail, each 



%^S 



Fig. 143. — Coprinus lagopus. Semi-dia- 

 grammatic transverse section through 

 the pileus and stipe of an unexpanded 

 fruit-body : /, the pileus-fiesh ; g, the 

 gills ; i, the interlamellar spaces ; c, 

 the cystidia ; and s, the stipe. The 

 black layer at the surface of the gills 

 is made up of the black spores of the 

 long and short basidia and of the protu- 

 berant shafts of the long basidia. The 

 illustration shows that the cystidia all 

 bridge the interlamellar spaces and act 

 as distance-pieces. Magnification, 29. 



cystidium is elongated-oval, rounded at the apex, somewhat bulging 

 in the middle, and contracted into a stalk at the base. In an un- 

 expanded fruit-body, both ends of a cystidium are firmly attached 

 to the gills and are held by clasping somewhat enlarged para- 

 physes which, collectively, often form a bulge on the hymenium 



1 For a discussion of the packing of the elements of the hymenium in Coprini, 

 vide pp. 154-155. 



