128 Plant Biology 



Pikus 



_(^/7/s— > 



Hypha -JUI 



Basidium.- 



^tenqmata-- 



Button " dasidiospores— 

 ^ypha \ 



AiyceU 



Fig. 41. — Common edible or field mushroom (Psalliota [Agaricus] campestris) 

 of the phylum Eumycophyta, class Basidiomycetes. A, The so-called mushroom 

 (sporophyte) ; B, three gills of the mushroom in cross section; C, one gill much 

 enlarged to show its hyphae and basidia ; D, a basidium with basidiospores; E; 

 germinating spore; F, immature "button" mushroom; G, later stage in develop- 

 ment of the immature into the mature mushroom. 



c 



Fig. 42. — Shelf (bracket) fungus of the phylum Eumycophyta, class Basidio- 

 mycetes. A, Attached to a tree; B, section of a sporophore showing three annual 

 layers of the porous hymenium, with the newest below; C, undersurface showing 

 openings to pores, beneath which are borne the basidiospores. 



